subject:(Spray combustion)

University of Illinois – Urbana-Champaign

1. Lin, Yilu. Characterization of spray and combustion of diesel-alcohol blends in a constant volume chamber.

Degree: MS, Mechanical Engineering, 2016, University of Illinois – Urbana-Champaign

► In this study, the spray combustion characteristics of Acetone-Butanol-Ethanol (ABE)/ Diesel blends was investigated. An optical-accessible constant volume chamber capable of controlling ambient temperature, pressure… (more)

Subjects/Keywords: Spray; Combustion; Constant Volume Chamber

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APA (6^th Edition):

Lin, Y. (2016). Characterization of spray and combustion of diesel-alcohol blends in a constant volume chamber. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/93048

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lin, Yilu. “Characterization of spray and combustion of diesel-alcohol blends in a constant volume chamber.” 2016. Thesis, University of Illinois – Urbana-Champaign. Accessed March 05, 2021. http://hdl.handle.net/2142/93048.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lin, Yilu. “Characterization of spray and combustion of diesel-alcohol blends in a constant volume chamber.” 2016. Web. 05 Mar 2021.

Vancouver:

Lin Y. Characterization of spray and combustion of diesel-alcohol blends in a constant volume chamber. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2016. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/2142/93048.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lin Y. Characterization of spray and combustion of diesel-alcohol blends in a constant volume chamber. [Thesis]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/93048

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Manchester

2. Majhool, Ahmed Abed Al-Kadhem. Advanced Spray and Combustion Modelling.

Degree: 2011, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:123849

► Abstract Advanced Spray and Combustion Modelling Ahmed Abed Al-Kadhem Majhool, 2011 Doctor of Philosophy, The University of ManchesterThe first attempt at modelling a fully Eulerian… (more)

▼ Abstract Advanced Spray and Combustion Modelling Ahmed Abed Al-Kadhem Majhool, 2011 Doctor of Philosophy, The University of ManchesterThe first attempt at modelling a fully Eulerian model for poly-disperse nature of the spray flowwithout using droplet size classes was proposed by Beck and Watkins [2003a]. The parametersused to describe the distribution of droplet sizes are the moments of the droplet size distributionfunction. Transport equations for only some moments of the spray distribution function arederived and solved through classical Eulerian schemes. The velocities to be used in the twotransport equations are obtained by defining moment-average quantities and constructing furthertransport equations for the relevant moment-average velocities. The continuous distribution ofdroplets is approximated using an analytically integrable function to use as a number distributionwas sought such that the volume distribution it produced was a reasonable approximation to aRosin-Rammler distribution. The new form of the continuous function was later revised by Yueand Watkins [2004], who implemented the Gamma distribution whose parameters were obtainedfrom the transport equations for second, third and fourth moments. This permits the form ofthe two parameter number size distribution to be totally calculated and to all predictions ofchanges to the distribution in space and time. Hydrodynamics submodels were implementedin Jones [2009] with higher order of numerical tools. The model is implemented in a new codebased on current numerical methods detailed in Ferziger and Peri ́ [2002], so as to make use of chigh resolution differencing schemes for the transportation of the moments and enable improvedresolution of the solution by using an unstructured grid topology.The thesis presents work across three different subjects of investigations into the modelling ofspray development and its interaction with non-reactive and reactive flow. The first part ofthis research is aimed to create a new and robust family of convective scheme to capture theinterface between the dispersed and the carrier phases without the need to build up the interfaceboundary. The selection of Weighted Average Flux (WAF) scheme is due to this scheme beingdesigned to deal with random flux scheme which is second-order accurate in space and time. Theconvective flux in each cell face utilizes the WAF scheme blended with Switching Technique forAdvection and Capturing of Surfaces (STACS) scheme for high resolution flux limiters. Howeverin the next step, the high resolution scheme is blended with the scheme to provide the sharpnessand boundedness of the interface by using switching strategy. The proposed scheme is tested on capturing the spray edges in modelling hollow cone type sprays without need to reconstructtwo-phase interface. A test comparison between TVD scheme and WAF scheme using the sameflux limiter on convective flow on hollow cone spray is presented. Results show that the WAFscheme gives better prediction than the TVD scheme. The only way to check the… Advisors/Committee Members: Watkins, Paul.

Subjects/Keywords: spray; unstructured grid; evaporation; combustion; modelling

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APA (6^th Edition):

Majhool, A. A. A. (2011). Advanced Spray and Combustion Modelling. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:123849

Chicago Manual of Style (16^th Edition):

Majhool, Ahmed Abed Al-Kadhem. “Advanced Spray and Combustion Modelling.” 2011. Doctoral Dissertation, University of Manchester. Accessed March 05, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:123849.

MLA Handbook (7^th Edition):

Majhool, Ahmed Abed Al-Kadhem. “Advanced Spray and Combustion Modelling.” 2011. Web. 05 Mar 2021.

Vancouver:

Majhool AAA. Advanced Spray and Combustion Modelling. [Internet] [Doctoral dissertation]. University of Manchester; 2011. [cited 2021 Mar 05]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:123849.

Council of Science Editors:

Majhool AAA. Advanced Spray and Combustion Modelling. [Doctoral Dissertation]. University of Manchester; 2011. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:123849

University of Manchester

3. Majhool, Ahmed Abed Al-Kadhem. Advanced spray and combustion modelling.

Degree: PhD, 2011, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/advanced-spray-and-combustion-modelling(eb3ef22a-53d0-4e70-aa9d-bec37775d451).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538400

► The thesis presents work across three different subjects of investigations into the modelling of spray development and its interaction with non-reactive and reactive flow. The… (more)

▼ The thesis presents work across three different subjects of investigations into the modelling of spray development and its interaction with non-reactive and reactive flow. The first part of this research is aimed to create a new and robust family of convective scheme to capture the interface between the dispersed and the carrier phases without the need to build up the interface boundary. The selection of Weighted Average Flux (WAF) scheme is due to this scheme being designed to deal with random flux scheme which is second-order accurate in space and time. The convective flux in each cell face utilizes the WAF scheme blended with Switching Technique for Advection and Capturing of Surfaces (STACS) scheme for high resolution flux limiters. However in the next step, the high resolution scheme is blended with the scheme to provide the sharpness and boundedness of the interface by using switching strategy. The proposed scheme is tested on capturing the spray edges in modelling hollow cone type sprays without need to reconstruct two-phase interface. A test comparison between TVD scheme and WAF scheme using the same flux limiter on convective flow on hollow cone spray is presented. Results show that the WAF scheme gives better prediction than the TVD scheme. The only way to check the accuracy of the presented models are evaluations according to physical droplets behaviour and its interaction with air. In the second part, due to the effect of evaporation the temperature profile in the released fuel vapour has been proposed. The underlying equation utilizes transported vapour mass fraction. It can be used along with the solution of heat transfer inside a sphere. After applying boundary conditions, the equation can provide a solution of existing conditions at liquid-gas interface undergoing evaporation and it is put in a form similar to well-known one-third rule equation. The resulting equation is quadratic type that gives an accurate prediction for the thermo-physical properties due to the non-linear relation between measured properties and temperature. Comparisons are made with one-third rule where both equations are implemented in simulating hollow cone spray under evaporation conditions. The results show the presumed equation performs better than one-third rule in all comparisons. The third part of this research is about a conceptual model for turbulent spray combustion for two combustion regimes that has been proposed and tested for n-heptane solid cone spray type injected into a high-pressure, high-temperature open reactor by comparing to the available experimental data and to results obtained using two well known combustion models named the Combined Combustion Model (CCM) and the unsteady two-dimensional conditional moment closure (CMC) model. A single-zone intermittent beta-two equation turbulent model is suggested to characterise the Lumped zone. This model can handle both unburned and burned zones. Intermittency theory is used to account for the spatially non-uniform distribution of viscous dissipation. The model…

Subjects/Keywords: 662; spray, unstructured grid, evaporation, combustion, modelling

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APA (6^th Edition):

Majhool, A. A. A. (2011). Advanced spray and combustion modelling. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/advanced-spray-and-combustion-modelling(eb3ef22a-53d0-4e70-aa9d-bec37775d451).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538400

Chicago Manual of Style (16^th Edition):

Majhool, Ahmed Abed Al-Kadhem. “Advanced spray and combustion modelling.” 2011. Doctoral Dissertation, University of Manchester. Accessed March 05, 2021. https://www.research.manchester.ac.uk/portal/en/theses/advanced-spray-and-combustion-modelling(eb3ef22a-53d0-4e70-aa9d-bec37775d451).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538400.

MLA Handbook (7^th Edition):

Majhool, Ahmed Abed Al-Kadhem. “Advanced spray and combustion modelling.” 2011. Web. 05 Mar 2021.

Vancouver:

Majhool AAA. Advanced spray and combustion modelling. [Internet] [Doctoral dissertation]. University of Manchester; 2011. [cited 2021 Mar 05]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/advanced-spray-and-combustion-modelling(eb3ef22a-53d0-4e70-aa9d-bec37775d451).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538400.

Council of Science Editors:

Majhool AAA. Advanced spray and combustion modelling. [Doctoral Dissertation]. University of Manchester; 2011. Available from: https://www.research.manchester.ac.uk/portal/en/theses/advanced-spray-and-combustion-modelling(eb3ef22a-53d0-4e70-aa9d-bec37775d451).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538400

Delft University of Technology

4. Panagopoulos, Christos (author). Theoretical and Numerical Analysis of Laminar Ethanol Spray Flames for the creation of a Spray Flamelet Library.

Degree: 2017, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:02a8fd3c-486a-41c7-80b7-b7161247a2f7

► Combustion of fuels appears in many sets of equipment and applications that involve transformation of a primary not useful form of energy into a secondary… (more)

▼ Combustion of fuels appears in many sets of equipment and applications that involve transformation of a primary not useful form of energy into a secondary usable one that can be employed for purposes of electricity generation, transportation and industrial thermochemical processes. Strict environmental regulations demand for the reduction of the pollutants emissions (e.g. NO_x CO₂, CO, SO₂, etc.) that are responsible for the global warming of the planet and the formation of acid rain and smog. Since renewable energy sources cannot replace the use of fossil fuels in the foreseeable future alternative ways have to be investigated. Combustion of biofuels such as liquid ethanol, a well known and widely used alcohol, under MILD (Moderate or Intense Low-oxygen Dilution) conditions is a scenario on that direction. From the one hand, combustion of biofuels offers sustainability and lower greenhouse gas emissions and from the other, MILD conditions offer more uniform and lower peak temperature profiles reducing so the nitrogen oxides emissions and increasing the lifetime of the combustion chamber. However, modeling of ethanol spray turbulent combustion is a complicated problem since it involves many different phenomena that are coupled between each other including the injection of the spray, the atomization into droplets and the dispersion in the domain, the turbulence of the gaseous flow, the mass, momentum and energy exchange between the two phases and finally the combustion. The closure of the unresolved chemical source terms in the numerical analysis of such a problem is a challenge and the Flamelet Generated Manifolds (FGM) method appears as a perspective approach to deal with it. This method approximates the turbulent flame as an ensemble of laminar, thin, one dimensional, counterflow flames the so-called flamelets. In that way the chemical reactions can be decoupled from the turbulence field and be calculated separately. The results are stored in look-up tables that are retrieved during the turbulence simulation with the use of connecting variables. Not having found a way so far to relate a spray flamelet look-up table with the turbulence flow many researchers create a gaseous flamelet table instead ignoring the spray and evaporation effects in it. As it has been reported this omittance can possibly lead to over-prediction of the temperature and important species profiles in the modeling of the turbulent flame. In this study, both a gaseous and spray ethanol flamelet library are created so that a direct comparison between the two can be done. The interference of spray influences the structure of the flame making it deviate significantly from the gaseous flamelets. The results show that not only the strain rate (as for the case of the gaseous flamelets), but also the equivalence ratio implied in the fuel side and the initial droplets’ diameter influence the flame structure of the spray flamelets. A non-slip velocity between the droplets and the carrier gas is kept as a boundary condition for all the cases.… Advisors/Committee Members: Roekaerts, Dirk (mentor), Ma, Likun (mentor), Delft University of Technology (degree granting institution).

Subjects/Keywords: Spray Combustion; Laminar Flamelets; MILD; Biofuels

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APA (6^th Edition):

Panagopoulos, C. (. (2017). Theoretical and Numerical Analysis of Laminar Ethanol Spray Flames for the creation of a Spray Flamelet Library. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:02a8fd3c-486a-41c7-80b7-b7161247a2f7

Chicago Manual of Style (16^th Edition):

Panagopoulos, Christos (author). “Theoretical and Numerical Analysis of Laminar Ethanol Spray Flames for the creation of a Spray Flamelet Library.” 2017. Masters Thesis, Delft University of Technology. Accessed March 05, 2021. http://resolver.tudelft.nl/uuid:02a8fd3c-486a-41c7-80b7-b7161247a2f7.

MLA Handbook (7^th Edition):

Panagopoulos, Christos (author). “Theoretical and Numerical Analysis of Laminar Ethanol Spray Flames for the creation of a Spray Flamelet Library.” 2017. Web. 05 Mar 2021.

Vancouver:

Panagopoulos C(. Theoretical and Numerical Analysis of Laminar Ethanol Spray Flames for the creation of a Spray Flamelet Library. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 05]. Available from: http://resolver.tudelft.nl/uuid:02a8fd3c-486a-41c7-80b7-b7161247a2f7.

Council of Science Editors:

Panagopoulos C(. Theoretical and Numerical Analysis of Laminar Ethanol Spray Flames for the creation of a Spray Flamelet Library. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:02a8fd3c-486a-41c7-80b7-b7161247a2f7

Universitat Politècnica de València

5. Xuan, Tiemin. Optical investigations on Diesel spray dynamics and in-flame soot formation .

Degree: 2018, Universitat Politècnica de València

URL: http://hdl.handle.net/10251/94626

► En las últimas décadas ha avanzado mucho la comprensión científica sobre el proceso de combustión de los chorros diesel de inyección directa gracias al desarrollo… (more)

▼ En las últimas décadas ha avanzado mucho la comprensión científica sobre el proceso de combustión de los chorros diesel de inyección directa gracias al desarrollo de todo tipo de técnicas e instalaciones ópticas. Además, se han desarrollado y mejorado una gran cantidad de modelos de Dinámica de Fluidos Computacional (CFD), los cuales se usan para el desarrollo de motores altamente eficientes y con bajas emisiones. Sin embargo, debido a la complejidad de los procesos físicos y químicos involucrados en este proceso de combustión, así como a las limitaciones significativas de los experimentos, aún hay muchas cuestiones sin responder: ¿Cómo afecta la combustión a la dinámica del chorro? ¿Cómo cuantificar de forma efectiva la cantidad de hollín y la temperatura del mismo en la llama? ¿Cómo afecta el flujo del aire y las inyecciones partidas al desarrollo del chorro y a la formación de hollín en condiciones no quiescente? Para ayudar a resolver las preguntas planteadas, el objetivo de este trabajo se pone en investigar al dinámica del chorro y la formación de hollín de los chorros Diesel de inyección directa en condiciones quiescentes y no quiescentes por medio de diferentes técnicas ópticas. El trabajo se ha dividido en dos bloques principales. El primero está centrado en el estudio de las modificaciones inducidas por la combustión en la dinámica del chorro, así como la caracterización de la formación de hollín en la llama, todo ello en condiciones quiescentes. Dichas condiciones son proporcionadas por una maqueta de flujo continuo a alta presión y temperatura. La expansión radial y axial del chorro reactivo se ha investigado usando n-dodecano, n-heptano y una mezcla binaria de combustibles primarios de referencia (80% n-heptano y 20% iso-octano en masa), basándose en una base de datos existente medida mediante visualización de schlieren. Se ha estudiado tanto el papel de las condiciones de operación como las propiedades del combustible. A continuación se ha desarrollado por primera vez una técnica combinada de extinción-radiación, aplicada a la medida de hollín en llamas diesel. Gracias a esta técnica, tanto la fracción volumétrica de hollín como la temperatura se obtuvieron simultáneamente considerando los efectos de la autoabsorción en la radiación. Todo este trabajo se ha desarrollado dentro del marco de actividades de la Engine Combustion Network (ECN). El segundo bloque corresponde a la caracterización de la dinámica del chorro y de la formación de hollín en condiciones no quiescentes, que ocurren en la cámara de combustión de un motor monocilíndrico de dos tiempos con accesos ópticos. En esta parte, se ha llevado a cabo en primer lugar la visualización del chorro para una inyección única en condiciones no-reactivas y reactivas. Se han aplicado la visualización simultánea de schlieren y de la quimioluminiscencia del radical OH* para obtener la penetración del chorro y la longitud de despegue de la llama, mientras que la visualización de la extinción de ombroscopía difusa (DBI) se ha aplicado para cuantificar la… Advisors/Committee Members: García Oliver, José María (advisor).

Subjects/Keywords: Optical investigation; Diesel spray; Combustion; Soot

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Xuan, T. (2018). Optical investigations on Diesel spray dynamics and in-flame soot formation . (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/94626

Chicago Manual of Style (16^th Edition):

Xuan, Tiemin. “Optical investigations on Diesel spray dynamics and in-flame soot formation .” 2018. Doctoral Dissertation, Universitat Politècnica de València. Accessed March 05, 2021. http://hdl.handle.net/10251/94626.

MLA Handbook (7^th Edition):

Xuan, Tiemin. “Optical investigations on Diesel spray dynamics and in-flame soot formation .” 2018. Web. 05 Mar 2021.

Vancouver:

Xuan T. Optical investigations on Diesel spray dynamics and in-flame soot formation . [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2018. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/10251/94626.

Council of Science Editors:

Xuan T. Optical investigations on Diesel spray dynamics and in-flame soot formation . [Doctoral Dissertation]. Universitat Politècnica de València; 2018. Available from: http://hdl.handle.net/10251/94626

Colorado State University

6. Dobos, Aron Peter. Quasidimensional modeling of reacting fuel sprays using detailed chemical kinetics.

Degree: PhD, Mechanical Engineering, 2016, Colorado State University

URL: http://hdl.handle.net/10217/178914

► Since its invention in the late 1800s, the internal combustion engine has been indispensable to society for motive transport at all scales worldwide. Despite growing… (more)

▼ Since its invention in the late 1800s, the internal combustion engine has been indispensable to society for motive transport at all scales worldwide. Despite growing concern about the environmental damage caused by the pervasive use of these engines, no compelling alternative has yet emerged that matches the internal combustion engine's robustness, versatility, and high power-to-weight ratio. Consequently, as requirements on engine designs continue to increase to meet new emissions and efficiency standards, there is a strong need for computationally efficient and accurate predictive modeling of complex engine combustion processes. This work presents an efficient approach to direct injection engine combustion simulation that uses detailed chemical kinetics with a quasidimensional fuel spray model. Instead of a full multidimensional approach that solves continuity, momentum, energy, and chemistry equations simultaneously over a fine grid, the spatial information is greatly reduced and modeled phenomenologically. The model discretizes the fuel spray into independent parcels that entrain air from the surroundings and account for liquid fuel vaporization. Gas phase species concentrations and heat release in each parcel are calculated by detailed chemical kinetic mechanisms for the fuel under consideration. Comparisons of predicted pressure, heat release, and emissions with data from diesel engine experiments show good agreement overall, and suggest that spray combustion processes can be modeled without calibration of empirical constants at a significantly lower computational cost than with standard multidimensional tools. The new combustion model is also used to investigate spray structure and emissions trends for biodiesel fuels in a compression ignition engine. Results underscore the complex relationships among operational parameters, fuel chemistry, and NOx emissions, and provide further evidence of a link between stoichiometry near the flame lift-off length and formation of NOx. In addition, fuel molecular structure is demonstrated to be a significant factor in NOx emissions, but more robust chemical kinetic mechanisms and soot models for biodiesel are likely needed for improved predictive accuracy in modeling alternative fuels. Advisors/Committee Members: Kirkpatrick, Allan T. (advisor), Marchese, Anthony (committee member), Gao, Xinfeng (committee member), Venayagamoorthy, Karan (committee member).

Subjects/Keywords: combustion; kinetics; spray; engine; chemical; simulation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dobos, A. P. (2016). Quasidimensional modeling of reacting fuel sprays using detailed chemical kinetics. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/178914

Chicago Manual of Style (16^th Edition):

Dobos, Aron Peter. “Quasidimensional modeling of reacting fuel sprays using detailed chemical kinetics.” 2016. Doctoral Dissertation, Colorado State University. Accessed March 05, 2021. http://hdl.handle.net/10217/178914.

MLA Handbook (7^th Edition):

Dobos, Aron Peter. “Quasidimensional modeling of reacting fuel sprays using detailed chemical kinetics.” 2016. Web. 05 Mar 2021.

Vancouver:

Dobos AP. Quasidimensional modeling of reacting fuel sprays using detailed chemical kinetics. [Internet] [Doctoral dissertation]. Colorado State University; 2016. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/10217/178914.

Council of Science Editors:

Dobos AP. Quasidimensional modeling of reacting fuel sprays using detailed chemical kinetics. [Doctoral Dissertation]. Colorado State University; 2016. Available from: http://hdl.handle.net/10217/178914

University of Sydney

7. Singh, Gajendra. Atomization and Combustion Characterization of Sprays .

Degree: 2020, University of Sydney

URL: http://hdl.handle.net/2123/23135

► This thesis presents an extensive study of turbulent air-blasted sprays aimed at advancing the current understanding of the atomization and the turbulent combustion of dense… (more)

▼ This thesis presents an extensive study of turbulent air-blasted sprays aimed at advancing the current understanding of the atomization and the turbulent combustion of dense sprays. The burner employed controls the spray quality by recessing the liquid-injecting needle inside the air-blast tube to transition the spray from dilute to dense. A pilot is used to stabilize the flame to the burner which is sitting in a co-flowing stream of secondary air. Three fuels, acetone, ethanol, and biodiesel, are used to generate several sprays that cover a broad range of non-dimensional numbers. Probability distributions of wavelength and amplitude of instabilities forming on coaxial air-blast atomizers are measured directly using high-speed shadowgraphs (or back-lit microscopic imaging), in a range of cases that investigate the independent effects of a suite of parameters. The influence of jet velocity and gas velocity on the initiation and growth of jet instabilities is discussed. The range of mechanisms governing the formation of liquid fragments and their relation to surface instabilities is discussed. Previous work suggested that the mean wavelength scales with the boundary layer thickness. This is confirmed here and extended to demonstrate that the wavelength probability distribution correlates well with the ligament length probability distribution. This establishes a direct link between interfacial instabilities and ligament formation in air-assisted primary atomization. The complete structure of atomizing liquid fragments is analyzed by employing multi-dimensional visualization techniques and advanced image processing, where objects from multiple views are matched to extract three-dimensional information. An in-house MATLAB script is developed to extract the spray volume, which employs the principle of image discretization, where each image is divided into a number of slices, and the individual slice from each camera is matched to compute the liquid volume fraction in each image. The volume of individual objects is calculated based on their planar area and orientation. An error analysis is performed using dozens of three-dimensional virtual models of fragment-like shapes with a known volume. Local characteristics of atomizing fragments are discussed by using the information obtained through the slicing method. A detailed account of fragment statistics are provided for the atomizing sprays. The LIF-OH-CH2O technique is used to measure the product of OH and CH2O ([OH]*[CH2O]) and hence the heat release zones in turbulent, moderately dense spray flames of ethanol and biodiesel fuels. A combination of several filters is used to remove interference from droplet luminosity. Mie scattering is measured jointly on a separate camera to locate the droplets with respect to the reaction zones. It is found that while the overall flame structure is similar to that of a diffusion flame. Structures referred to as burning rings of different sizes are observed, and these are ignited by heat source before they grow, propagate, and burnout.…

Subjects/Keywords: Spray; Combustion; Atomization; Instabilities; Optical Diagnostics

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APA (6^th Edition):

Singh, G. (2020). Atomization and Combustion Characterization of Sprays . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/23135

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Singh, Gajendra. “Atomization and Combustion Characterization of Sprays .” 2020. Thesis, University of Sydney. Accessed March 05, 2021. http://hdl.handle.net/2123/23135.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Singh, Gajendra. “Atomization and Combustion Characterization of Sprays .” 2020. Web. 05 Mar 2021.

Vancouver:

Singh G. Atomization and Combustion Characterization of Sprays . [Internet] [Thesis]. University of Sydney; 2020. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/2123/23135.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Singh G. Atomization and Combustion Characterization of Sprays . [Thesis]. University of Sydney; 2020. Available from: http://hdl.handle.net/2123/23135

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

8. Domingo-Alvarez, Patricia. High-pressure combustion large-eddy simulation for an a priori optical diagnostics validation : Simulation aux grandes échelles de la combustion haute pression pour la validation à priori des diagnostics optiques.

Degree: Docteur es, Energétique, 2019, Normandie

URL: http://www.theses.fr/2019NORMIR26

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Afin de réduire la consommation spécifique et les émissions de CO₂ des moteurs aéronautiques, les industriels cherchent à augmenter la pression maximale dans le cycle… (more)

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Afin de réduire la consommation spécifique et les émissions de CO₂ des moteurs aéronautiques, les industriels cherchent à augmenter la pression maximale dans le cycle thermodynamique de Brayton. Cette augmentation de pression entraîne un fort impact sur la structure de la flamme (épaisseur, vitesse, cinétique chimique) mais également sur les émissions de polluants, tels que les NOx. Les émissions de NOx peuvent être limitées en adoptant des technologies innovantes comme les chambres de combustion low-NOx. De même, la haute pression dans la chambre impacte également les propriétés radiatives des gaz brûlés, qui sont importantes pour les diagnostics optiques utilisés pour caractériser la flamme. Un nouveau système d’injection de type pauvre prémélangé (LP pour Lean-Premixed) pour brûleurs aéronautiques a été étudié expérimentalement au laboratoire CORIA à Rouen avec des diagnostics optiques avancés. Dans le cadre de ces travaux, des simulations aux grandes échelles de ce système ont été réalisées pour un point de fonctionnement de référence à 8.33bar et 669.3K. L’impact des caractéristiques de l’atomisation sur la flamme est évalué par une étude paramétrique. Une analyse du temps d’évaporation caractéristique et de son influence sur la flamme a été effectuée. Cette étude paramétrique montre que la qualité de l’atomisation influence fortement la topologie de la flamme et la distribution du combustible dans la chambre de combustion. Les résultats numériques sont ensuite comparés aux données expérimentales afin d’apporter des précisions sur la topologie de la flamme. De plus, un modèle à deux niveaux capable de simuler la Fluorescence Induite par Laser (LIF) a été développé. Le but de ce modèle est de pouvoir comparer des images brutes obtenues expérimentalement avec les résultats numériques. À cet effet, l’interaction faisceau laser / gaz brûlés est modélisée pour quantifier les phénomènes d’absorption et de “quenching”, qui sont importants pour obtenir des mesures quantitatives à partir du signal de fluorescence. Avec ce modèle, les simulations permettent d’évaluer les propriétés radiatives des gaz brûlés le long du parcours de la nappe laser.

To reduce the specific consumption and CO2 emissions of aircraft engines, manufacturers are seeking to increase the maximum pressure in Brayton’s thermodynamic cycle. This pressure increase has a strong impact on the flame structure (thickness, speed, chemical kinetics) but also on pollutant emissions. High pressure leads to an increase in NOx emissions, which can be reduced by the adoption of low-NOx technologies. It also impacts the radiative properties of the burnt gases. These burnt gases are important since they are used in optical diagnostics to characterize the flame. A new Lean-Premixed (LP) injection system for aeronautical burners was experimentally investigated with advanced optical diagnostics at CORIA laboratory in Rouen. This work aims to perform Large-Eddy Simulations of this injector at a reference operating point at 8.33 bar and669.3K. The spray features impact…

Advisors/Committee Members: Grisch, Frédéric (thesis director).

Subjects/Keywords: Combustion turbulente; Spray; Large-Eddy Simulation; Turbulent combustion; High-pressure; Spray; Laser-Induced Fluorescence

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Domingo-Alvarez, P. (2019). High-pressure combustion large-eddy simulation for an a priori optical diagnostics validation : Simulation aux grandes échelles de la combustion haute pression pour la validation à priori des diagnostics optiques. (Doctoral Dissertation). Normandie. Retrieved from http://www.theses.fr/2019NORMIR26

Chicago Manual of Style (16^th Edition):

Domingo-Alvarez, Patricia. “High-pressure combustion large-eddy simulation for an a priori optical diagnostics validation : Simulation aux grandes échelles de la combustion haute pression pour la validation à priori des diagnostics optiques.” 2019. Doctoral Dissertation, Normandie. Accessed March 05, 2021. http://www.theses.fr/2019NORMIR26.

MLA Handbook (7^th Edition):

Domingo-Alvarez, Patricia. “High-pressure combustion large-eddy simulation for an a priori optical diagnostics validation : Simulation aux grandes échelles de la combustion haute pression pour la validation à priori des diagnostics optiques.” 2019. Web. 05 Mar 2021.

Vancouver:

Domingo-Alvarez P. High-pressure combustion large-eddy simulation for an a priori optical diagnostics validation : Simulation aux grandes échelles de la combustion haute pression pour la validation à priori des diagnostics optiques. [Internet] [Doctoral dissertation]. Normandie; 2019. [cited 2021 Mar 05]. Available from: http://www.theses.fr/2019NORMIR26.

Council of Science Editors:

Domingo-Alvarez P. High-pressure combustion large-eddy simulation for an a priori optical diagnostics validation : Simulation aux grandes échelles de la combustion haute pression pour la validation à priori des diagnostics optiques. [Doctoral Dissertation]. Normandie; 2019. Available from: http://www.theses.fr/2019NORMIR26

9. Mirat, Clément. Analyse des instabilités de combustion dans des foyers de centrale thermique fonctionnant au fioul lourd : Analysis of combustion instabilities in thermal power plants operating with heavy fuel oil.

Degree: Docteur es, Energétique, 2015, Châtenay-Malabry, Ecole centrale de Paris

URL: http://www.theses.fr/2015ECAP0037

► Des crises vibratoires ont été constatées dans plusieurs centrales thermiques d’EDF opérant avec du fioul lourd, certaines ayant entraîné l’arrêt du foyer. Ce travail traite… (more)

▼ Des crises vibratoires ont été constatées dans plusieurs centrales thermiques d’EDF opérant avec du fioul lourd, certaines ayant entraîné l’arrêt du foyer. Ce travail traite des instabilités de combustion pouvant se déclencher dans ce type de système où le combustible liquide est injecté avec de la vapeur d’eau et où l’écoulement d’air est mis en rotation. Ces phénomènes vibratoires résultent d’un couplage résonant entre la dynamique de la combustion et l’acoustique du foyer. La réponse acoustique des flammes diphasiques non-prémélangées swirlées reste largement méconnue et est difficilement analysable sur le foyer réel. L’objectif de ce travail est donc d’étudier la stabilité des chaudières EDF à partir de l’analyse de la réponse d’une flamme diphasique non-prémélangée swirlée issue d’un injecteur générique et soumise à des perturbations de la vitesse acoustique. Cette réponse est déterminée sur un dispositif original (DIFAV) équipé d’un swirler et d’un injecteur bi-fluides fonctionnant à la vapeur d’eau et au dodécane. Ce système est constitué des principaux éléments des brûleurs utilisés sur les centrales thermiques EDF à une échelle 1/7000. Le dispositif est conçu pour facilement modifier la géométrie de la tête d’injection, les conditions d’injection de combustible et de vapeur et ainsi contrôler le spray généré. Des visualisations à la sortie d’une buse d’injection montrent l’influence de la topologie de l’écoulement diphasique dans l’injecteur sur la taille des gouttes mesurées dans le spray. Des mesures de taille et de vitesse des gouttes lorsque le rapport des débits de vapeur et de combustible (GLR) est modifié sont réalisées. Ces données comparées à des modèles ont permis d’estimer l’évolution de la taille des gouttes générées par l’injecteur qui équipe les centrales thermiques lorsque le GLR varie. Une analyse modale du foyer DIFAV et d’un modèle simplifié de la chaudière réelle est ensuite menée. Les fréquences propres et les taux d’amortissement du foyer DIFAV sont déterminés expérimentalement en soumettant le système à une modulation acoustique externe. Un modèle acoustique simplifié composé de trois cavités couplées représentatif du brûleur DIFAV est également développé. Des simulations acoustiques réalisées avec COMSOL Multiphysics sur une coupe transverse d’une chaudière générique représentative de la chaudière industrielle permettent d’identifier trois modes à basses fréquences établis entre les plenums et la chambre de combustion qui sont susceptibles d’être instables. La sensibilité de ces modes à la géométrie du foyer et aux conditions limites est étudiée. La réponse de la flamme générique lorsqu’elle est soumise à des modulations acoustiques de l’écoulement d’air en amont du brûleur est ensuite mesurée sur le banc DIFAV pour différents niveaux d’excitation et deux topologies de flamme lorsque les conditions d’injection sont modifiées. Les mécanismes qui pilotent l’évolution du gain de l’une des fonctions de transfert généralisées (FDF) de la flamme sont étudiés à l’aide de visualisations en… Advisors/Committee Members: Schuller, Thierry (thesis director).

Subjects/Keywords: Ecoulement swirlé; Spray; Dynamique de la combustion; Instabilités de combustion; Swirl flame; Spray; Combustion dynamics; Thermo-acoustics instabilities

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mirat, C. (2015). Analyse des instabilités de combustion dans des foyers de centrale thermique fonctionnant au fioul lourd : Analysis of combustion instabilities in thermal power plants operating with heavy fuel oil. (Doctoral Dissertation). Châtenay-Malabry, Ecole centrale de Paris. Retrieved from http://www.theses.fr/2015ECAP0037

Chicago Manual of Style (16^th Edition):

Mirat, Clément. “Analyse des instabilités de combustion dans des foyers de centrale thermique fonctionnant au fioul lourd : Analysis of combustion instabilities in thermal power plants operating with heavy fuel oil.” 2015. Doctoral Dissertation, Châtenay-Malabry, Ecole centrale de Paris. Accessed March 05, 2021. http://www.theses.fr/2015ECAP0037.

MLA Handbook (7^th Edition):

Mirat, Clément. “Analyse des instabilités de combustion dans des foyers de centrale thermique fonctionnant au fioul lourd : Analysis of combustion instabilities in thermal power plants operating with heavy fuel oil.” 2015. Web. 05 Mar 2021.

Vancouver:

Mirat C. Analyse des instabilités de combustion dans des foyers de centrale thermique fonctionnant au fioul lourd : Analysis of combustion instabilities in thermal power plants operating with heavy fuel oil. [Internet] [Doctoral dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2015. [cited 2021 Mar 05]. Available from: http://www.theses.fr/2015ECAP0037.

Council of Science Editors:

Mirat C. Analyse des instabilités de combustion dans des foyers de centrale thermique fonctionnant au fioul lourd : Analysis of combustion instabilities in thermal power plants operating with heavy fuel oil. [Doctoral Dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2015. Available from: http://www.theses.fr/2015ECAP0037

10. Enjalbert, Nicolas. Modélisation avancée de la combustion turbulente diphasique en régime de forte dilution par les gaz brûlés : Advanced modeling of two phase turbulent combustion with strong dilution by burnt gases.

Degree: Docteur es, Energétique, 2011, Rouen, INSA

URL: http://www.theses.fr/2011ISAM0023

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Afin de contribuer à l'amélioration des simulations numériques de foyers industriels avec recycle de gaz brûlés et combustible liquide, la modélisation de la combustion turbulente… (more)

Subjects/Keywords: Combustion diphasique; Combustion turbulente; Mécanique des fluides; LES; Spray; Simulation numérique; Turbulent combustion

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Enjalbert, N. (2011). Modélisation avancée de la combustion turbulente diphasique en régime de forte dilution par les gaz brûlés : Advanced modeling of two phase turbulent combustion with strong dilution by burnt gases. (Doctoral Dissertation). Rouen, INSA. Retrieved from http://www.theses.fr/2011ISAM0023

Chicago Manual of Style (16^th Edition):

Enjalbert, Nicolas. “Modélisation avancée de la combustion turbulente diphasique en régime de forte dilution par les gaz brûlés : Advanced modeling of two phase turbulent combustion with strong dilution by burnt gases.” 2011. Doctoral Dissertation, Rouen, INSA. Accessed March 05, 2021. http://www.theses.fr/2011ISAM0023.

MLA Handbook (7^th Edition):

Enjalbert, Nicolas. “Modélisation avancée de la combustion turbulente diphasique en régime de forte dilution par les gaz brûlés : Advanced modeling of two phase turbulent combustion with strong dilution by burnt gases.” 2011. Web. 05 Mar 2021.

Vancouver:

Enjalbert N. Modélisation avancée de la combustion turbulente diphasique en régime de forte dilution par les gaz brûlés : Advanced modeling of two phase turbulent combustion with strong dilution by burnt gases. [Internet] [Doctoral dissertation]. Rouen, INSA; 2011. [cited 2021 Mar 05]. Available from: http://www.theses.fr/2011ISAM0023.

Council of Science Editors:

Enjalbert N. Modélisation avancée de la combustion turbulente diphasique en régime de forte dilution par les gaz brûlés : Advanced modeling of two phase turbulent combustion with strong dilution by burnt gases. [Doctoral Dissertation]. Rouen, INSA; 2011. Available from: http://www.theses.fr/2011ISAM0023

11. Magalhães de Oliveira, Pedro. Ignition and propagation mechanisms of spray flames.

Degree: PhD, 2019, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/297690https://www.repository.cam.ac.uk/bitstream/1810/297690/2/PM%20de%20Oliveira%20-%20PhD%20thesis%2c%20Cambridge%202019.mp4

► Fuel droplets represent strong inhomogeneities that are generally detrimental and intensify the stochastic behaviour of ignition. Still, the presence of small droplets has been found… (more)

▼ Fuel droplets represent strong inhomogeneities that are generally detrimental and intensify the stochastic behaviour of ignition. Still, the presence of small droplets has been found to decrease minimum ignition energies and enhance flame speeds. In this study, a comprehensive analysis of the phases of ignition in sprays is carried out in a controlled, well-characterised experiment: the initiation of a spherically expanding flame in a turbulent droplet-laden jet by a laser spark. A revision of definitions of ignition-related terms is proposed based on a critical time scale of the spark effects on the flame, evaluated from OH* visualisation, allowing for a distinction between the phases of kernel generation and flame growth. Based on the critical time scale, ignition failure time scales can be measured, as well as kernel sizes conditional on ignition or failure. Small kernels typically quenched faster than the critical time scale, characterising the short-mode failure. This mode was suppressed by increasing the laser energy and, consequently, the initial kernel size. Still, the ignitability of lean ethanol mixtures was only effectively improved through high-energy sparks and partial prevaporisation, with ignition being limited by breakdown. In jet fuel sprays, a suppression of short and long-mode failure occurred by decreasing the droplet size. In fact, by doing this, different flame propagation mechanisms were observed by OH/fuel PLIF. Both aviation fuels investigated – Jet A and a renewable alternative, ATJ-8 – exhibited similar flame speed behaviour due to changes in droplet size in each of the modes identified: the droplet, inter-droplet, and gaseous-like propagation modes. Concentrated reactions around large droplets found in lean conditions allowed for a slowly propagating flame front which ignited new droplets. Stoichiometric to rich conditions presented stronger evaporation at the flame and higher and more uniform heat release. Still, large droplets penetrated the flame, locally inducing regions of negative curvature and continuing to evaporate in the products. The droplet-induced effects disappeared at low SMD and rich conditions, giving rise to a fully gaseous layer at the flame and the highest flame speeds. Finally, insight and data from experiments are used to improve a low-order ignition model towards applications with sprays. Fuel fluctuations are modelled using a stochastic approach, and the extinction criterion of the model is calibrated. The model is then tested for an aviation gas-turbine combustor.

Subjects/Keywords: spray combustion; flame propagation; ignition; jet fuel; low-order modelling; polydisperse spray; two-phase flow

10 more images…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Magalhães de Oliveira, P. (2019). Ignition and propagation mechanisms of spray flames. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/297690https://www.repository.cam.ac.uk/bitstream/1810/297690/2/PM%20de%20Oliveira%20-%20PhD%20thesis%2c%20Cambridge%202019.mp4

Chicago Manual of Style (16^th Edition):

Magalhães de Oliveira, Pedro. “Ignition and propagation mechanisms of spray flames.” 2019. Doctoral Dissertation, University of Cambridge. Accessed March 05, 2021. https://www.repository.cam.ac.uk/handle/1810/297690https://www.repository.cam.ac.uk/bitstream/1810/297690/2/PM%20de%20Oliveira%20-%20PhD%20thesis%2c%20Cambridge%202019.mp4.

MLA Handbook (7^th Edition):

Magalhães de Oliveira, Pedro. “Ignition and propagation mechanisms of spray flames.” 2019. Web. 05 Mar 2021.

Vancouver:

Magalhães de Oliveira P. Ignition and propagation mechanisms of spray flames. [Internet] [Doctoral dissertation]. University of Cambridge; 2019. [cited 2021 Mar 05]. Available from: https://www.repository.cam.ac.uk/handle/1810/297690https://www.repository.cam.ac.uk/bitstream/1810/297690/2/PM%20de%20Oliveira%20-%20PhD%20thesis%2c%20Cambridge%202019.mp4.

Council of Science Editors:

Magalhães de Oliveira P. Ignition and propagation mechanisms of spray flames. [Doctoral Dissertation]. University of Cambridge; 2019. Available from: https://www.repository.cam.ac.uk/handle/1810/297690https://www.repository.cam.ac.uk/bitstream/1810/297690/2/PM%20de%20Oliveira%20-%20PhD%20thesis%2c%20Cambridge%202019.mp4

Delft University of Technology

12. Both, Ambrus (author). RANS-FGM simulation of n-heptane spray flame in OpenFOAM: A new implementation of flamelet generated manifold to account for enthalpy loss with detailed reaction mechanisms.

Degree: 2017, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:0851a55a-4490-4176-a587-20b9585c09be

►

The efficient and clean combustion of liquid fuels is a fundamental requirement in the design of future energy systems. Simulation plays a more and more… (more)

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The efficient and clean combustion of liquid fuels is a fundamental requirement in the design of future energy systems. Simulation plays a more and more important role in the design of such burners. In this work the spray combustion simulation approach introduced by Ma (2016) is improved, and validated against the CORIA Jet Spray Flame database (Verdier et al., 2017). The database presents droplet temperatures measured by global rainbow refractometry technique, which gives a unique insight in the flame structure. The two phase flow is treated with an Eulerian-Lagrangian approach. Flamelet Generated Manifold (FGM) is used to model the gas phase combustion. The RANS equations are solved using final volume method, with standard k − ε turbulence modelling. The turbulence-chemistry interaction is addressed with assumed probability density function method. The spray cloud is modelled with the Lagrangian transport of droplets including heat and mass transfer. Ma (2016) developed a solver based on the OpenFOAM 2.3.x libraries. His development is complemented in this work with a novel spray model. The improved spray modelling allows the treatment of droplet evaporation in the context of FGM without limiting the complexity of the chemical mechanism. This improvement is crucial for the modelling of complex fuels and the correct prediction of emissions. The modelling concept is rather light-weight considering the RANS approach. Despite the low computational expenses, most of the results agree fairly well with the measurement data. However the correct prediction of droplet temperature remains an an unresolved problem. Ma, L. (2016). Computational modelling of turbulent spray combustion. PhD Thesis, Delft University of Technology. Verdier, A., Santiago, J. M., Vandel, A., Saengkaew, S., Cabot, G., Grehan, G., and Renou, B. (2017). Experimental study of local flame structures and fuel droplet properties of a spray jet flame. Proceedings of the Combustion Institute , 36(2):2595-2602.

Sustainable Process and Energy

Advisors/Committee Members: Roekaerts, Dirk (mentor), Boersma, Bendiks Jan (graduation committee), Lahaye, Domenico (graduation committee), Tummers, Mark (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Flamelet Generated Manifold; RANS; CORIA Jet Spray Flame; Turbulent Spray Combustion; Simulation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Both, A. (. (2017). RANS-FGM simulation of n-heptane spray flame in OpenFOAM: A new implementation of flamelet generated manifold to account for enthalpy loss with detailed reaction mechanisms. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:0851a55a-4490-4176-a587-20b9585c09be

Chicago Manual of Style (16^th Edition):

Both, Ambrus (author). “RANS-FGM simulation of n-heptane spray flame in OpenFOAM: A new implementation of flamelet generated manifold to account for enthalpy loss with detailed reaction mechanisms.” 2017. Masters Thesis, Delft University of Technology. Accessed March 05, 2021. http://resolver.tudelft.nl/uuid:0851a55a-4490-4176-a587-20b9585c09be.

MLA Handbook (7^th Edition):

Both, Ambrus (author). “RANS-FGM simulation of n-heptane spray flame in OpenFOAM: A new implementation of flamelet generated manifold to account for enthalpy loss with detailed reaction mechanisms.” 2017. Web. 05 Mar 2021.

Vancouver:

Both A(. RANS-FGM simulation of n-heptane spray flame in OpenFOAM: A new implementation of flamelet generated manifold to account for enthalpy loss with detailed reaction mechanisms. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 05]. Available from: http://resolver.tudelft.nl/uuid:0851a55a-4490-4176-a587-20b9585c09be.

Council of Science Editors:

Both A(. RANS-FGM simulation of n-heptane spray flame in OpenFOAM: A new implementation of flamelet generated manifold to account for enthalpy loss with detailed reaction mechanisms. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:0851a55a-4490-4176-a587-20b9585c09be

Universitat Politècnica de València

13. Bardi, Michele. PARTIAL NEEDLE LIFT AND INJECTION RATE SHAPE EFFECT ON THE FORMATION AND COMBUSTION OF THE DIESEL SPRAY .

Degree: 2014, Universitat Politècnica de València

URL: http://hdl.handle.net/10251/37374

► Fuel direct injection represents one of the key turning points in the development of the Diesel engines. The appeal of this solution has been growing… (more)

▼ Fuel direct injection represents one of the key turning points in the development of the Diesel engines. The appeal of this solution has been growing thanks to the parallel advancement in the technology of the injection hardware and in the knowledge of the physics involved in the spray formation and combustion. In the present thesis, the effect of partial needle lift and injection rate shaping has been investigated experimentally using a multi-orifice Diesel injector. Injection rate shaping is one of the most attractive alternatives to multiple injection strategies but its implementation has been for long time impeded by technological limitations. A novel direct-acting injector prototype made it possible to carry out the present research: this injector features a mechanical coupling between the nozzle needle and the piezo-stack actuator, allowing a fully flexible control on the nozzle needle movement and enabling partial needle lift as well as the implementation of alternative injection rate shapes typologies. Different optical diagnostics were applied to study the spray development and combustion in a novel continuous flow test chamber that allows an accurate control on a wide range of thermodynamic conditions (up to 1000K and 15MPa). In addition, hydraulic characterization tests were carried out to analyze the fuel flow through the injector nozzle. Partial needle lift has been found to affect the injection event, reducing the mass flow rate (as expected) but also causing a reduction in the effective orifice area and an increase on the spreading angle. Moreover, at this condition, higher hole-to-hole dispersion and flow instabilities were detected. Needle vibrations caused by the needle interactions with fuel flow and by the onset of cavitation in the needle seat are likely the causes of this behavior. Injection rate shaping has a substantial impact on the premixed phase of the combustion and on the location where the ignition takes place. Furthermore, the results proved that the modifications in the internal flow caused by the partial needle lift are reflected on the ignition timing. On the other hand, the analysis of the experimental data through a 1D spray model revealed that an increasing mass flow rate (e.g. ramp or boot injection rate profiles) causes an increase in the fuelair equivalence ratio at the lift-off length and a consequent higher soot formation during the diffusive phase of the combustion. Finally, the wide range of boundary conditions tested in all the experiments served to draw general conclusions about the physics involved in the injection/combustion event and, in some cases, to obtain statistical correlations. Advisors/Committee Members: Payri Marín, Raúl (advisor).

Subjects/Keywords: Diesel Injection; Spray formation; Spray combustion; Partial needle lift; Injection rate shapeing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bardi, M. (2014). PARTIAL NEEDLE LIFT AND INJECTION RATE SHAPE EFFECT ON THE FORMATION AND COMBUSTION OF THE DIESEL SPRAY . (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/37374

Chicago Manual of Style (16^th Edition):

Bardi, Michele. “PARTIAL NEEDLE LIFT AND INJECTION RATE SHAPE EFFECT ON THE FORMATION AND COMBUSTION OF THE DIESEL SPRAY .” 2014. Doctoral Dissertation, Universitat Politècnica de València. Accessed March 05, 2021. http://hdl.handle.net/10251/37374.

MLA Handbook (7^th Edition):

Bardi, Michele. “PARTIAL NEEDLE LIFT AND INJECTION RATE SHAPE EFFECT ON THE FORMATION AND COMBUSTION OF THE DIESEL SPRAY .” 2014. Web. 05 Mar 2021.

Vancouver:

Bardi M. PARTIAL NEEDLE LIFT AND INJECTION RATE SHAPE EFFECT ON THE FORMATION AND COMBUSTION OF THE DIESEL SPRAY . [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2014. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/10251/37374.

Council of Science Editors:

Bardi M. PARTIAL NEEDLE LIFT AND INJECTION RATE SHAPE EFFECT ON THE FORMATION AND COMBUSTION OF THE DIESEL SPRAY . [Doctoral Dissertation]. Universitat Politècnica de València; 2014. Available from: http://hdl.handle.net/10251/37374

14. Magalhães de Oliveira, Pedro. Ignition and propagation mechanisms of spray flames.

Degree: PhD, 2019, University of Cambridge

URL: https://doi.org/10.17863/CAM.44744 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787821

► Fuel droplets represent strong inhomogeneities that are generally detrimental and intensify the stochastic behaviour of ignition. Still, the presence of small droplets has been found… (more)

▼ Fuel droplets represent strong inhomogeneities that are generally detrimental and intensify the stochastic behaviour of ignition. Still, the presence of small droplets has been found to decrease minimum ignition energies and enhance flame speeds. In this study, a comprehensive analysis of the phases of ignition in sprays is carried out in a controlled, well-characterised experiment: the initiation of a spherically expanding flame in a turbulent droplet-laden jet by a laser spark. A revision of definitions of ignition-related terms is proposed based on a critical time scale of the spark effects on the flame, evaluated from OH* visualisation, allowing for a distinction between the phases of kernel generation and flame growth. Based on the critical time scale, ignition failure time scales can be measured, as well as kernel sizes conditional on ignition or failure. Small kernels typically quenched faster than the critical time scale, characterising the short-mode failure. This mode was suppressed by increasing the laser energy and, consequently, the initial kernel size. Still, the ignitability of lean ethanol mixtures was only effectively improved through high-energy sparks and partial prevaporisation, with ignition being limited by breakdown. In jet fuel sprays, a suppression of short and long-mode failure occurred by decreasing the droplet size. In fact, by doing this, different flame propagation mechanisms were observed by OH/fuel PLIF. Both aviation fuels investigated - Jet A and a renewable alternative, ATJ-8 - exhibited similar flame speed behaviour due to changes in droplet size in each of the modes identified: the droplet, inter-droplet, and gaseous-like propagation modes. Concentrated reactions around large droplets found in lean conditions allowed for a slowly propagating flame front which ignited new droplets. Stoichiometric to rich conditions presented stronger evaporation at the flame and higher and more uniform heat release. Still, large droplets penetrated the flame, locally inducing regions of negative curvature and continuing to evaporate in the products. The droplet-induced effects disappeared at low SMD and rich conditions, giving rise to a fully gaseous layer at the flame and the highest flame speeds. Finally, insight and data from experiments are used to improve a low-order ignition model towards applications with sprays. Fuel fluctuations are modelled using a stochastic approach, and the extinction criterion of the model is calibrated. The model is then tested for an aviation gas-turbine combustor.

Subjects/Keywords: spray combustion; flame propagation; ignition; jet fuel; low-order modelling; polydisperse spray; two-phase flow

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Magalhães de Oliveira, P. (2019). Ignition and propagation mechanisms of spray flames. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.44744 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787821

Chicago Manual of Style (16^th Edition):

Magalhães de Oliveira, Pedro. “Ignition and propagation mechanisms of spray flames.” 2019. Doctoral Dissertation, University of Cambridge. Accessed March 05, 2021. https://doi.org/10.17863/CAM.44744 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787821.

MLA Handbook (7^th Edition):

Magalhães de Oliveira, Pedro. “Ignition and propagation mechanisms of spray flames.” 2019. Web. 05 Mar 2021.

Vancouver:

Magalhães de Oliveira P. Ignition and propagation mechanisms of spray flames. [Internet] [Doctoral dissertation]. University of Cambridge; 2019. [cited 2021 Mar 05]. Available from: https://doi.org/10.17863/CAM.44744 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787821.

Council of Science Editors:

Magalhães de Oliveira P. Ignition and propagation mechanisms of spray flames. [Doctoral Dissertation]. University of Cambridge; 2019. Available from: https://doi.org/10.17863/CAM.44744 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.787821

University of Sydney

15. Lowe, Albyn. Flow and Temperature-field Structure of Turbulent Spray Flames: From Dilute to Dense .

Degree: 2018, University of Sydney

URL: http://hdl.handle.net/2123/20144

► The novel diagnostic approaches employed in this dissertation showcase the on-going development of experimental datasets in turbulent spray jets and flames; for both physical insight… (more)

▼ The novel diagnostic approaches employed in this dissertation showcase the on-going development of experimental datasets in turbulent spray jets and flames; for both physical insight and model validation. The piloted Sydney Needle Spray Burner (SYNSBURNTM) is introduced for this purpose, featuring air-blast atomization with liquid injection from a needle that can be translated within a co-flowing air stream. The pilot-stabilized spray flames can range between the two extremes of dilute and dense by physically translating the needle tip relative to the burner’s exit plane. The burner provides a versatile platform for studying complex multi-phase flows more akin to practical combustors and the resulting analysis has proved useful in the development and validation of related models for turbulent spray jets and flames. The stability characteristics for these spray flames are presented for multiple recess lengths using acetone, ethanol and biodiesel fuels. LDV/PDA and high-speed shadowgraphy are performed in the dense atomization region of spray jets and flames to characterise the flow-field. A novel classification scheme based on shape is developed and used to clearly define the boundary conditions and to map the evolution of liquid fragments. The characteristic final breakup point of the liquid column, as well as the onset of primary and secondary atomization regimes are spatially-resolved using these techniques. The first temperature measurements in turbulent dilute and dense spray flames using single- laser-shot chirped-probe-pulse femtosecond coherent anti-Stokes Raman spectroscopy (CPP-fs-CARS) are demonstrated and the subsequent dataset analysed. The state-of-the-art 5 kHz CPP-fs-CARS system has achieved integration times of 3 picoseconds (ps) as well as spatial resolution of approximately 800μm along beam propagation and 60μm in the transverse dimension. New details of the technique, calibration, correction of interferences, and spectral fitting procedures relevant to turbulent spray flame thermometry are presented, along with estimates of the associated error. The measurements are validated against well-established datasets in comparable gaseous flames. The thermal structure of spray flames is spatially and temporally resolved. The correlation between the flow and temperature-field show that thermal structures in turbulent spray flames are affected by liquid morphology in the near-field. The wealth of information available in these combined datasets has provided great insight into partially-premixed combustion.

Subjects/Keywords: Spray Jets; Turbulent Spray combustion; Automization; Droplet Dynamics; Temperature measurements; Femtosecond-CARS

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lowe, A. (2018). Flow and Temperature-field Structure of Turbulent Spray Flames: From Dilute to Dense . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/20144

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lowe, Albyn. “Flow and Temperature-field Structure of Turbulent Spray Flames: From Dilute to Dense .” 2018. Thesis, University of Sydney. Accessed March 05, 2021. http://hdl.handle.net/2123/20144.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lowe, Albyn. “Flow and Temperature-field Structure of Turbulent Spray Flames: From Dilute to Dense .” 2018. Web. 05 Mar 2021.

Vancouver:

Lowe A. Flow and Temperature-field Structure of Turbulent Spray Flames: From Dilute to Dense . [Internet] [Thesis]. University of Sydney; 2018. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/2123/20144.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lowe A. Flow and Temperature-field Structure of Turbulent Spray Flames: From Dilute to Dense . [Thesis]. University of Sydney; 2018. Available from: http://hdl.handle.net/2123/20144

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Toronto

16. Chatterjee, Sandipan. Turbulent Non-premixed Swirl-Stabilized Flames of Gaseous and Liquid Fuels in a Gas Turbine Model Combustor.

Degree: PhD, 2019, University of Toronto

URL: http://hdl.handle.net/1807/94067

► Turbulent non-premixed swirl-stabilized flames of gaseous and liquid fuels were investigated experimentally in an optically-accessible gas turbine model combustor. Propane/air and ethylene/air flames were operated… (more)

▼ Turbulent non-premixed swirl-stabilized flames of gaseous and liquid fuels were investigated experimentally in an optically-accessible gas turbine model combustor. Propane/air and ethylene/air flames were operated at three global fuel-air equivalence ratios. Spray flames of liquid n-heptane fuel were stabilized at six global fuel-air equivalence ratios. The velocity, reaction zone structure and soot measurements were performed using stereoscopic particle image velocimetry, planar laser induced fluorescence of OH radicals and laser induced incandescence, respectively. In all the experimented test flow cases, the time-averaged velocity data show the presence of two large recirculation zones, separated by a zone of high velocity swirled inflow. The inner recirculation zone, which surrounds the combustor axis, shows high turbulence intensities. In gaseous fuel flames, the inner recirculation zone also contained most of the combustion-generated soot concentration of the flow field of gaseous fuel flames. The flow field regions exterior to the inner recirculation zone showed negligible soot values mainly due to the soot oxidation caused by the high intensity turbulence as well as strong OH intensity near the recirculation zone boundary. The time-averaged soot values showed strong sensitivity to changes in the air flow rates. The changes in the air flow rate mostly increased the soot intermittency, while the instantaneous soot concentrations stayed nearly constant. Intensified turbulence as well as shortening of flow time for soot chemistry are speculated to be the reasons for the high sensitivity of soot values to air flow rates. Further, in n-heptane/air flames, the velocity data showed a region of high velocity fuel droplets, positioned in-between two large recirculation zones. The boundary of the inner recirculation zones showed the heat release events, thereby leading to high OH counts. The OH fluorescence profiles showed the major role played by the recirculation zones in fuel droplet evaporation, forming the evaporated fuel-air reactant mixture, and subsequently, igniting the reactant mixture in the presence of hot combustion products and active radicals. Advisors/Committee Members: Gulder, Omer L, Aerospace Science and Engineering.

Subjects/Keywords: Gas Turbine Combustion; LII Soot Measurement; SPIV and OH-PLIF; Spray Combustion; Swirl Stabilized Combustion; Turbulent Non-premixed Combustion; 0538

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chatterjee, S. (2019). Turbulent Non-premixed Swirl-Stabilized Flames of Gaseous and Liquid Fuels in a Gas Turbine Model Combustor. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/94067

Chicago Manual of Style (16^th Edition):

Chatterjee, Sandipan. “Turbulent Non-premixed Swirl-Stabilized Flames of Gaseous and Liquid Fuels in a Gas Turbine Model Combustor.” 2019. Doctoral Dissertation, University of Toronto. Accessed March 05, 2021. http://hdl.handle.net/1807/94067.

MLA Handbook (7^th Edition):

Chatterjee, Sandipan. “Turbulent Non-premixed Swirl-Stabilized Flames of Gaseous and Liquid Fuels in a Gas Turbine Model Combustor.” 2019. Web. 05 Mar 2021.

Vancouver:

Chatterjee S. Turbulent Non-premixed Swirl-Stabilized Flames of Gaseous and Liquid Fuels in a Gas Turbine Model Combustor. [Internet] [Doctoral dissertation]. University of Toronto; 2019. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/1807/94067.

Council of Science Editors:

Chatterjee S. Turbulent Non-premixed Swirl-Stabilized Flames of Gaseous and Liquid Fuels in a Gas Turbine Model Combustor. [Doctoral Dissertation]. University of Toronto; 2019. Available from: http://hdl.handle.net/1807/94067

17. Hervo, Loïc. Simulation numérique de l’écoulement d’un mélange air et phase dispersée pour l’allumage d’une chambre de combustion aéronautique via un formalisme Euler Lagrange : Numerical simulation of an air flow with a dispersed phase for the ignition of an aeronautical combustion chamber with an Euler Lagrange method.

Degree: Docteur es, Energétique et transferts, 2017, Toulouse, ISAE

URL: http://www.theses.fr/2017ESAE0043

►

L'objectif de cette thèse est de contribuer au développement et à la validation d'outils numériques permettant la Simulation aux Grandes Echelles (SGE) de l'allumage d'un… (more)

▼

L'objectif de cette thèse est de contribuer au développement et à la validation d'outils numériques permettant la Simulation aux Grandes Echelles (SGE) de l'allumage d'un écoulement turbulent diphasique dans une chambre de combustion. Pour ce faire, une méthode de dépôt d'énergie modélisant l'apport d'énergie lié au claquage de la bougie d'allumage a été implémentée dans la chaîne de calcul CEDRE. Cette méthode a été validée sur une simulation de l'allumage d'un écoulement laminaire purement gazeux d'air et de propane. Une SGE de l'écoulement d'air du MERCATO a été effectué à l'aide du solveur Navier-Stokes CHARME de CEDRE. Cette simulation reproduit fidèlement l'écoulement turbulent non-réactif dans la chambre de combustion. Une méthode d'injection simplifiée FIMUR a été ajoutée au solveur lagrangien SPARTE de CEDRE. Dans cette méthode, des gouttes sont injectées directement au nez de l'injecteur avec une distribution de vitesse et de taille imposée. Une SGE de l'écoulement turbulent diphasique dispersé non-réactif dans la chambre MERCATO a ensuite été réalisée avec cette méthode. La comparaison des champs particulaires moyens de vitesse et de taille obtenus par simulation numérique avec les données expérimentales est satisfaisante. Enfin, des SGE de l'allumage de la chambre MERCATO ont été effectuées à partir du champ diphasique non-réactif simulé et de la méthode de dépôt d'énergie développée. Selon l'instant du dépôt d'énergie, les simulations conduisent à des allumages réussis ou ratés. La propagation de la flamme dans la chambre pour un allumage réussi a fait l'objet d'une analyse détaillée pour tenter de déterminer les principaux facteurs l'influençant.

The goal of this thesis is to contribute to the development and validation of numerical tools for the Large Eddy Simulation (LES) of the ignition of a turbulent multiphase flow in a combustion chamber. An energy deposition method that models the energy supplied by the spark plug to the flow was implemented in the CEDRE code. This method was validated on a simulation of the ignition of a purely gaseous laminar propane-air flow. Then, a LES of the non-reacting gas flow in the monosector combustor MERCATO was performed with the Navier-Stokes solver CHARME of the CEDRE code. The comparison between simulations and experiments demonstrates that the main flow field features are well reproduced. In order to simulate the non-reacting dispersed two-phase flow of the same configuration, a simplified injection method called FIMUR was implemented in the Lagrangian solver SPARTE of the CEDRE code. In this method, droplets are injected directly at the tip of the injector with velocities deduced from experimental correlations while the size distribution is directly obtained from experimental data. The comparison of the mean droplet velocity and diameter fields in the vicinity of the injector between simulations and experiments appears satisfactory. Finally, LES's of the ignition of the MERCATO were performed using the non-reacting two-phase flow simulations and the…

Advisors/Committee Members: Cuenot, Bénédicte (thesis director), Senoner, Jean-Mathieu (thesis director).

Subjects/Keywords: Simulation numérique; Écoulement diphasique; Combustion; Allumage; Spray; Euler-Lagrange; Numerical simulation; Multiphase flow; Combustion; Ignition; Spray; Euler-Lagrange; 532

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hervo, L. (2017). Simulation numérique de l’écoulement d’un mélange air et phase dispersée pour l’allumage d’une chambre de combustion aéronautique via un formalisme Euler Lagrange : Numerical simulation of an air flow with a dispersed phase for the ignition of an aeronautical combustion chamber with an Euler Lagrange method. (Doctoral Dissertation). Toulouse, ISAE. Retrieved from http://www.theses.fr/2017ESAE0043

Chicago Manual of Style (16^th Edition):

Hervo, Loïc. “Simulation numérique de l’écoulement d’un mélange air et phase dispersée pour l’allumage d’une chambre de combustion aéronautique via un formalisme Euler Lagrange : Numerical simulation of an air flow with a dispersed phase for the ignition of an aeronautical combustion chamber with an Euler Lagrange method.” 2017. Doctoral Dissertation, Toulouse, ISAE. Accessed March 05, 2021. http://www.theses.fr/2017ESAE0043.

MLA Handbook (7^th Edition):

Hervo, Loïc. “Simulation numérique de l’écoulement d’un mélange air et phase dispersée pour l’allumage d’une chambre de combustion aéronautique via un formalisme Euler Lagrange : Numerical simulation of an air flow with a dispersed phase for the ignition of an aeronautical combustion chamber with an Euler Lagrange method.” 2017. Web. 05 Mar 2021.

Vancouver:

Hervo L. Simulation numérique de l’écoulement d’un mélange air et phase dispersée pour l’allumage d’une chambre de combustion aéronautique via un formalisme Euler Lagrange : Numerical simulation of an air flow with a dispersed phase for the ignition of an aeronautical combustion chamber with an Euler Lagrange method. [Internet] [Doctoral dissertation]. Toulouse, ISAE; 2017. [cited 2021 Mar 05]. Available from: http://www.theses.fr/2017ESAE0043.

Council of Science Editors:

Hervo L. Simulation numérique de l’écoulement d’un mélange air et phase dispersée pour l’allumage d’une chambre de combustion aéronautique via un formalisme Euler Lagrange : Numerical simulation of an air flow with a dispersed phase for the ignition of an aeronautical combustion chamber with an Euler Lagrange method. [Doctoral Dissertation]. Toulouse, ISAE; 2017. Available from: http://www.theses.fr/2017ESAE0043

INP Toulouse

18. Paulhiac, Damien. Modélisation de la combustion d’un spray dans un brûleur aéronautique : Modeling spray combustion in an aeronautical burner.

Degree: Docteur es, Énergétique et Transferts, 2015, INP Toulouse

URL: http://www.theses.fr/2015INPT0051

►

La combustion d’hydrocarbures représente encore aujourd’hui une part très majoritaire de la production d’énergie mondiale, en particulier dans la propulsion aérospatiale. La plupart des brûleurs… (more)

▼

La combustion d’hydrocarbures représente encore aujourd’hui une part très majoritaire de la production d’énergie mondiale, en particulier dans la propulsion aérospatiale. La plupart des brûleurs industriels sont alimentés par un carburant sous forme liquide, qui est injecté directement dans la chambre de combustion, ce qui génère une forte interaction entre le spray, l’écoulement turbulent et la zone de combustion. Cette interaction a déjà largement été étudiée, mais certaines questions restent ouvertes. En particulier, la prise en compte de la combustion de goutte isolée dans le cadre de la Simulation aux Grandes Echelles (‘Large Eddy Simulation’ LES) de géométries complexes reste un problème difficile. L’objectif de cette thèse est d’améliorer la modélisation de la combustion du spray dans le contexte de la LES de configurations complexes avec une approche Euler-Lagrange. Dans un premier temps, un modèle de combustion de gouttes incluant les différents régimes pour la LES, appelé MustARD pour « Multi-State Algorithm for Reacting Droplets », est proposé et validé dans plusieurs configurations académiques de complexité croissante. Dans un deuxième temps, MustARD est évalué sur une configuration de brûleur expérimental et comparé aux modèles classiques sans combustion de gouttes isolées. Cette étude montre que le régime de combustion de gouttes isolées n’est pas négligeable dans une telle configuration et qu’il modifie la structure de flamme. D’autre part, les comparaisons avec les résultats expérimentaux montrent que le modèle MustARD permet d’améliorer la précision des LES de sprays turbulents réactifs.

The combustion of hydrocarbons still represents the major part of the worldwide production of energy, especially for aerospace. Most industrials burners are fed with liquid fuel that is directly injected in the combustion chamber, generating a strong interaction between the spray, the turbulent flow and the combustion. This interaction has been widely studied, but is not yet fully understood. In particular, modeling individual droplet combustion, in the framework of Large Eddy Simulation (LES) of complex geometries, is a difficult issue. This work aims at improving models for spray combustion, in the context of two-phase reactive LES of complex configurations using an Euler-Lagrange approach. First, a droplet combustion model accounting for the various regimes and called MustARD for « Multi-State Algorithm for Reacting Droplets » is proposed and validated on several academic configurations of growing complexity. Second, MustARD is evaluated in the LES of a lab-scale burner and compared to classical models neglecting individual droplet combustion. Results show in particular the importance of the new model and its impact on the flame structure. Moreover, the comparison with experiments shows that MustARD contributes to improve the numerical prediction of LES of two-phase reacting flows.

Advisors/Committee Members: Cuenot, Bénédicte (thesis director), Riber, Eleonore (thesis director).

Subjects/Keywords: Spray; Combustion; Simulation aux grandes échelles; Simulation; Goutte; Euler-Lagrange; Spray; Combustion; Les; Simulation; Droplet; Euler-Lagrange

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Paulhiac, D. (2015). Modélisation de la combustion d’un spray dans un brûleur aéronautique : Modeling spray combustion in an aeronautical burner. (Doctoral Dissertation). INP Toulouse. Retrieved from http://www.theses.fr/2015INPT0051

Chicago Manual of Style (16^th Edition):

Paulhiac, Damien. “Modélisation de la combustion d’un spray dans un brûleur aéronautique : Modeling spray combustion in an aeronautical burner.” 2015. Doctoral Dissertation, INP Toulouse. Accessed March 05, 2021. http://www.theses.fr/2015INPT0051.

MLA Handbook (7^th Edition):

Paulhiac, Damien. “Modélisation de la combustion d’un spray dans un brûleur aéronautique : Modeling spray combustion in an aeronautical burner.” 2015. Web. 05 Mar 2021.

Vancouver:

Paulhiac D. Modélisation de la combustion d’un spray dans un brûleur aéronautique : Modeling spray combustion in an aeronautical burner. [Internet] [Doctoral dissertation]. INP Toulouse; 2015. [cited 2021 Mar 05]. Available from: http://www.theses.fr/2015INPT0051.

Council of Science Editors:

Paulhiac D. Modélisation de la combustion d’un spray dans un brûleur aéronautique : Modeling spray combustion in an aeronautical burner. [Doctoral Dissertation]. INP Toulouse; 2015. Available from: http://www.theses.fr/2015INPT0051

INP Toulouse

19. Shum-Kivan, Francis. Simulation des Grandes Echelles de flammes de spray et modélisation de la combustion non-prémélangée : Large Eddy Simulation of spray flames and modelling of non-premixed combustion.

Degree: Docteur es, Dynamique des fluides, 2017, INP Toulouse

URL: http://www.theses.fr/2017INPT0050

►

La combustion d’hydrocarbures représente encore aujourd’hui une part très majoritaire de la production d’énergie dans le monde, et en particulier dans l’industrie aéronautique. La plupart… (more)

▼

La combustion d’hydrocarbures représente encore aujourd’hui une part très majoritaire de la production d’énergie dans le monde, et en particulier dans l’industrie aéronautique. La plupart des brûleurs industriels sont alimentés par un carburant sous forme liquide, injecté directement dans la chambre de combustion, générant ainsi de fortes interactions entre le spray, l’écoulement turbulent et la flamme. Dans le but d’acquérir une meilleure compréhension de la structure complexe des flammes de spray, une étude numérique a été réalisée sur la configuration du brûleur diphasique KIAI, caractérisée de façon précise et complète expérimentalement. Une approche de type simulation des grandes échelles a été utilisée pour simuler la phase gazeuse tandis que la phase liquide était résolue selon un formalisme Lagrangien déterministe (LES-DPS). L’analyse détaillée de la structure de flamme de spray permet de mettre en exergue le rôle important de la combustion non prémélangée dans ce type de flamme. Cela a motivé dans une seconde étape le développement d’une nouvelle approche pour modéliser les flammes de diffusion turbulentes. Le modèle présenté s’appuie sur la réponse des flammes de diffusion laminaires au maillage, à l’étirement et au plissement. Le dégagement de chaleur global de la flamme a été analysé dans des configurations de complexité croissante, et la capacité du modèle à le décrire a été évaluée.

The combustion of hydrocarbons still represents a major part of the worldwide production of energy, especially in the aeronautical industry. Most industrial burners are fed with liquid fuel that is directly injected in the combustion chamber, generating a strong interaction between the spray, the turbulent flow and the flame. In order to provide a better understanding of turbulent spray flame complex structures, a numerical study has been performed on the two-phase flow burner KIAI which has been experimentally fully characterized. Numerical simulations consist of Large Eddy Simulation coupled to Discrete Particle Simulation for the dispersed phase (LES-DPS). A detailed analysis of the flame structure shows that non-premixed combustion plays an important role in this type of spray flame. This motivates, in a second step of the present work, the development of a new approach to model turbulent diffusion flames. The model is based on the response to the mesh, strain rate and wrinkling. The global flame heat release is analyzed through configurations of increasing complexity and the capacity of the model to describe it is evaluated.

Advisors/Committee Members: Cuenot, Bénédicte (thesis director), Riber, Eleonore (thesis director).

Subjects/Keywords: LES-DPS (Discrete Particle Simulation); Flamme de spray; Combustion non-prémélangée; LES-DPS; Spray flames; Non-premixed combustion

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shum-Kivan, F. (2017). Simulation des Grandes Echelles de flammes de spray et modélisation de la combustion non-prémélangée : Large Eddy Simulation of spray flames and modelling of non-premixed combustion. (Doctoral Dissertation). INP Toulouse. Retrieved from http://www.theses.fr/2017INPT0050

Chicago Manual of Style (16^th Edition):

Shum-Kivan, Francis. “Simulation des Grandes Echelles de flammes de spray et modélisation de la combustion non-prémélangée : Large Eddy Simulation of spray flames and modelling of non-premixed combustion.” 2017. Doctoral Dissertation, INP Toulouse. Accessed March 05, 2021. http://www.theses.fr/2017INPT0050.

MLA Handbook (7^th Edition):

Shum-Kivan, Francis. “Simulation des Grandes Echelles de flammes de spray et modélisation de la combustion non-prémélangée : Large Eddy Simulation of spray flames and modelling of non-premixed combustion.” 2017. Web. 05 Mar 2021.

Vancouver:

Shum-Kivan F. Simulation des Grandes Echelles de flammes de spray et modélisation de la combustion non-prémélangée : Large Eddy Simulation of spray flames and modelling of non-premixed combustion. [Internet] [Doctoral dissertation]. INP Toulouse; 2017. [cited 2021 Mar 05]. Available from: http://www.theses.fr/2017INPT0050.

Council of Science Editors:

Shum-Kivan F. Simulation des Grandes Echelles de flammes de spray et modélisation de la combustion non-prémélangée : Large Eddy Simulation of spray flames and modelling of non-premixed combustion. [Doctoral Dissertation]. INP Toulouse; 2017. Available from: http://www.theses.fr/2017INPT0050

20. Jamali, S.H. (author). Computational Modeling of Turbulent Ethanol Spray Flames in a Hot Diluted Coflow.

Degree: 2014, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:05e02a58-8e1a-4c61-8a52-a3771197302e

►

The phenomenon of turbulent spray combustion occurs in all industrial furnaces that consume liquid fuels. It is essential that a furnace is capable to have… (more)

▼

The phenomenon of turbulent spray combustion occurs in all industrial furnaces that consume liquid fuels. It is essential that a furnace is capable to have high efficiency and performance while the pollutant emissions meet the stricter national and international regulations. One of the recently proposed solutions to improve the aforementioned conditions is flameless spray combustion. In this process the combustion of fuel is done with oxidizer diluted with recirculated exhaust gases, which results in a lower peak temperature and more distributed reaction zone, so the NOx produced in conventional burners is highly reduced. Hence, it can be a promising approach in order to increase efficiency and decrease pollutant emission. Because flameless combustion is a novel concept, it should be fully investigated and optimized before being applied to large-scale cases. Due to the considerable costs of experimental tests, numerical simulation is used more and more to predict the performance of the flameless furnaces before utilizing them in a real case. The objective of this study is to develop and validate computational models for flameless spray combustion base on a validation study using the Delft Spray-in-Hot-Coflow (DSHC) flame. The burner has been designed to mimic the flameless oxidation of light oils. The properties of DSHC ethanol flames are computed by using a combination of CFD models for turbulence, chemistry and dispersed multiphase flow. The results are validated by comparison with the available experimental data for gas-phase velocity and temperature as well as droplets statistics. Furthermore, the experimental data are available for another case in which air is used instead of air diluted with exhaust gases. This case is also simulated to validate the models. This study employs a Reynolds-Averaged Navier Stokes (RANS) simulation approach. The combination of different turbulence and combustion models is investigated while the standard Lagrangian spray model is kept the same. The steady flamelet and the Flamelet Generated Manifold (FGM) models are two combustion models that are validated. It is shown that the FGM model can predict flame structure such as double-reaction region, lift-off, etc. better than the steady flamelet model. Moreover, it was observed that the Reynolds stress and the realizable k-epsilon models show similar results while the standard k-epsilon model performs differently. The effects of other models and parameters are also investigated. The results show that radiative heat transfer, secondary atomization and coalescence of droplets as well as buoyancy have negligible effects on the DSHC ethanol flame. Still, the effects of complete two-way coupling between two phases (liquid and gas) are demonstrated to be important.

Sustainable Prcoess and Energy Technology

Process and Energy

Mechanical, Maritime and Materials Engineering

Advisors/Committee Members: Roekaerts, D.J.E.M. (mentor), Ma, L. (mentor).

Subjects/Keywords: flameless combustion; spray combustion; Flamelet Generated Manifold (FGM); flamelet; Delft Spray-in-Hot-Coflow (DSHC) flame

10 more images…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jamali, S. H. (. (2014). Computational Modeling of Turbulent Ethanol Spray Flames in a Hot Diluted Coflow. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:05e02a58-8e1a-4c61-8a52-a3771197302e

Chicago Manual of Style (16^th Edition):

Jamali, S H (author). “Computational Modeling of Turbulent Ethanol Spray Flames in a Hot Diluted Coflow.” 2014. Masters Thesis, Delft University of Technology. Accessed March 05, 2021. http://resolver.tudelft.nl/uuid:05e02a58-8e1a-4c61-8a52-a3771197302e.

MLA Handbook (7^th Edition):

Jamali, S H (author). “Computational Modeling of Turbulent Ethanol Spray Flames in a Hot Diluted Coflow.” 2014. Web. 05 Mar 2021.

Vancouver:

Jamali SH(. Computational Modeling of Turbulent Ethanol Spray Flames in a Hot Diluted Coflow. [Internet] [Masters thesis]. Delft University of Technology; 2014. [cited 2021 Mar 05]. Available from: http://resolver.tudelft.nl/uuid:05e02a58-8e1a-4c61-8a52-a3771197302e.

Council of Science Editors:

Jamali SH(. Computational Modeling of Turbulent Ethanol Spray Flames in a Hot Diluted Coflow. [Masters Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:05e02a58-8e1a-4c61-8a52-a3771197302e

Universitat Politècnica de València

21. Pinotti, Mattia. COMBUSTION CONTROL OF DIESEL SPRAYS BY MEANS OF LASER INDUCED PLASMA IGNITION .

Degree: 2019, Universitat Politècnica de València

URL: http://hdl.handle.net/10251/130205

► [ES] En los últimos años, la investigación en motores se ha centrado principalmente en la reducción de emisiones contaminantes y en el aumento de la… (more)

▼ [ES] En los últimos años, la investigación en motores se ha centrado principalmente en la reducción de emisiones contaminantes y en el aumento de la eficiencia. Muchos de los esfuerzos de investigación actuales en este campo están dirigidos a mejorar y desarrollar nuevas estrategias activas para la reducción de emisiones, en particular centradas en los nuevos conceptos de combustión y en la obtención de un mejor control sobre ella. Su desarrollo requiere la aplicación de nuevas herramientas experimentales y teóricas. Estas herramientas deberían permitir tanto la aplicación de nuevas estrategias activas de control de contaminantes como ampliar el conocimiento básico de los fundamentos de los procesos involucrados. En este contexto es donde se encuadra el objetivo de esta Tesis: el desarrollo y optimización de un nuevo sistema de encendido no intrusivo y modulable, que permitirá el control sobre el tiempo y la ubicación del punto de encendido. Dicho sistema se aplicará para el encendido de chorros Diesel de inyección directa. En particular, se pretende evidenciar cómo las condiciones locales al encendido pueden afectar al desarrollo de la combustión posterior. Para lograr este objetivo, el trabajo de investigación se ha dividido en dos bloques principales. El primero se centra en el desarrollo y la optimización del sistema de encendido. Aprovechando las posibilidades que ofrece el proceso de inducción de plasma con láser y, una vez seleccionado el mejor método de inducción para su aplicación en un entorno especifico como el de un motor, se ha llevado a cabo un proceso de optimización y validación del sistema. Tal proceso resulta de importancia básica en el desarrollo de esta investigación, ya que la aplicación de un sistema de encendido totalmente fiable resulta ser fundamental, tanto en términos de su posible aplicación para control de combustión como en términos de las posibilidades de estudios que pueda ofrecer. Al principio, a partir de un extenso estudio de la literatura sobre el proceso de inducción de plasma con láser, se han obtenido los parámetros fundamentales a tener en cuenta para la aplicación del sistema al encendido de chorros de combustible de inyección directa. A partir de estos parámetros, se ha diseñado un primer sistema de encendido. Luego su fiabilidad en la inducción de plasma ha sido estudiada experimentalmente en condiciones ambientales y de motor, aplicando una metodología de optimización desarrollada en este mismo trabajo experimental. Como resultado principal de este primer bloque de trabajo, se ha podido obtener un sistema de encendido por plasma inducido con láser completamente optimizado y fiable, así como un método novedoso para su validación y optimización. El segundo bloque de trabajo corresponde a la aplicación del sistema al encendido de un chorro Diesel de inyección directa en condiciones reales del motor. El objetivo de este bloque era lograr dos hitos principales: la determinación de las capacidades y los límites del sistema en su aplicación, y el desarrollo de un primer estudio… Advisors/Committee Members: Pastor Soriano, José Vicente (advisor).

Subjects/Keywords: Optical Techniques; Diesel spray; Combustion basics; Combustion control; Laser Induced Plasma; Ignition System optimization

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APA (6^th Edition):

Pinotti, M. (2019). COMBUSTION CONTROL OF DIESEL SPRAYS BY MEANS OF LASER INDUCED PLASMA IGNITION . (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/130205

Chicago Manual of Style (16^th Edition):

Pinotti, Mattia. “COMBUSTION CONTROL OF DIESEL SPRAYS BY MEANS OF LASER INDUCED PLASMA IGNITION .” 2019. Doctoral Dissertation, Universitat Politècnica de València. Accessed March 05, 2021. http://hdl.handle.net/10251/130205.

MLA Handbook (7^th Edition):

Pinotti, Mattia. “COMBUSTION CONTROL OF DIESEL SPRAYS BY MEANS OF LASER INDUCED PLASMA IGNITION .” 2019. Web. 05 Mar 2021.

Vancouver:

Pinotti M. COMBUSTION CONTROL OF DIESEL SPRAYS BY MEANS OF LASER INDUCED PLASMA IGNITION . [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2019. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/10251/130205.

Council of Science Editors:

Pinotti M. COMBUSTION CONTROL OF DIESEL SPRAYS BY MEANS OF LASER INDUCED PLASMA IGNITION . [Doctoral Dissertation]. Universitat Politècnica de València; 2019. Available from: http://hdl.handle.net/10251/130205

Michigan Technological University

22. Ahmed Abdul Moiz. LOW TEMPERATURE SPLIT INJECTION SPRAY COMBUSTION: IGNITION, FLAME STABILIZATION AND SOOT FORMATION CHARACTERISTICS IN DIESEL ENGINE CONDITIONS.

Degree: PhD, Department of Mechanical Engineering-Engineering Mechanics, 2016, Michigan Technological University

URL: https://digitalcommons.mtu.edu/etdr/253

► The aim of the PhD work is to investigate the fundamental differences in combustion behavior when split injections are used in low temperature combustion… (more)

Subjects/Keywords: Low temperature combustion; multiple injection; split injection; diesel spray; flame stabilization; ignition; Heat Transfer, Combustion

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APA (6^th Edition):

Moiz, A. A. (2016). LOW TEMPERATURE SPLIT INJECTION SPRAY COMBUSTION: IGNITION, FLAME STABILIZATION AND SOOT FORMATION CHARACTERISTICS IN DIESEL ENGINE CONDITIONS. (Doctoral Dissertation). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/253

Chicago Manual of Style (16^th Edition):

Moiz, Ahmed Abdul. “LOW TEMPERATURE SPLIT INJECTION SPRAY COMBUSTION: IGNITION, FLAME STABILIZATION AND SOOT FORMATION CHARACTERISTICS IN DIESEL ENGINE CONDITIONS.” 2016. Doctoral Dissertation, Michigan Technological University. Accessed March 05, 2021. https://digitalcommons.mtu.edu/etdr/253.

MLA Handbook (7^th Edition):

Moiz, Ahmed Abdul. “LOW TEMPERATURE SPLIT INJECTION SPRAY COMBUSTION: IGNITION, FLAME STABILIZATION AND SOOT FORMATION CHARACTERISTICS IN DIESEL ENGINE CONDITIONS.” 2016. Web. 05 Mar 2021.

Vancouver:

Moiz AA. LOW TEMPERATURE SPLIT INJECTION SPRAY COMBUSTION: IGNITION, FLAME STABILIZATION AND SOOT FORMATION CHARACTERISTICS IN DIESEL ENGINE CONDITIONS. [Internet] [Doctoral dissertation]. Michigan Technological University; 2016. [cited 2021 Mar 05]. Available from: https://digitalcommons.mtu.edu/etdr/253.

Council of Science Editors:

Moiz AA. LOW TEMPERATURE SPLIT INJECTION SPRAY COMBUSTION: IGNITION, FLAME STABILIZATION AND SOOT FORMATION CHARACTERISTICS IN DIESEL ENGINE CONDITIONS. [Doctoral Dissertation]. Michigan Technological University; 2016. Available from: https://digitalcommons.mtu.edu/etdr/253

Georgia Tech

23. Kim, Sayop. Advancing turbulent spray and combustion models for compression ignition engine simulations.

Degree: PhD, Aerospace Engineering, 2019, Georgia Tech

URL: http://hdl.handle.net/1853/61216

► This thesis seeks to investigate the turbulent mixing influence on spray atomization and combustion processes encountered in compression ignition diesel engines. Despite greater thermal efficiency… (more)

▼ This thesis seeks to investigate the turbulent mixing influence on spray atomization and combustion processes encountered in compression ignition diesel engines. Despite greater thermal efficiency of diesel engine than spark ignition engine, the nature of stratified air-fuel mixture and non-premixed flame gives rise to unacceptable levels of nitrogen oxides (NOx) and particulate matter (PM), thus the use of diesel engines has often been limited to heavy-duty vehicle and industrial power sources. However, recent advancement in diesel engine combustion strategies, e.g. low temperature combustion (LTC), has demonstrated promising pathways towards improvement in the engine-out pollutants. Therefore, particularly in the effort of computer-aided engine design tasks, such a new engine design concept requires more accurate modeling techniques applicable over a broader range of engine operating conditions than those of conventional engine strategies. In the notion of challenges in new engine operating conditions, this thesis aims to present successful implementation of improvement in numerical modeling techniques in high-pressure spray atomization and resulting turbulent spray flame of interest. Three-dimensional Computational Fluid Dynamics (CFD) in in-cylinder turbu- lent combustion is considered an integral part of engine design progress, but rather a cost-prohibitive to apply over a broad range of engine relevant conditions. In spite of successful use of existing spray atomization modeling, prior researchers have pointed out some degree of failure in LTC targeted injection strategies. Furthermore, finite rate and strong nonlinearity of chemistry influenced by local turbulent mixing still re- main in challenges to account for in cost-efficient CFD analysis. In this context, a new attempt of hybrid spray primary breakup modeling is presented and demonstrated in successful application aimed at LTC technique. In addition, the Representative Interactive Flamelets (RIF) model with aid of multi-flamelets approach is extensively assessed in terms of predictive capability against classical combustion model. The combustion model employed in this study are fully examined in the general diesel combustion metric, e.g., ignition delay and flame lift-off length as well as newly sug- gested test metric, combustion recession. The combustion recession has been recently idenfied, but still remain largely unknown. Since the governing physics of this phenomenon is characterized by turbulent mixing coupled with finite rate chemistry, this can be considered as a relevant test metric for turbulent combustion models. In addition, very recent experimental studies have introduced a new non-sooting diesel combustion technique by manipulating direct injection method. The ducted fuel injection (DFI) has thus been demonstrated with its potential of low soot emissions. Knowing that the duct equipped ahead of injector nozzle was identifed to enhance turbulent mixing, investigations of DFI combustion may prove the effectiveness of turbulece-chemistry… Advisors/Committee Members: Genzale, Caroline (advisor), Jagoda, Jechiel (advisor), Oefelein, Joseph (committee member), Sun, Wenting (committee member), Alexeev, Alexander (committee member), Lucchini, Tommaso (committee member).

Subjects/Keywords: Diesel engine; CFD; Spray modeling; Turbulence-chemistry interaction; Combustion modeling

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APA (6^th Edition):

Kim, S. (2019). Advancing turbulent spray and combustion models for compression ignition engine simulations. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/61216

Chicago Manual of Style (16^th Edition):

Kim, Sayop. “Advancing turbulent spray and combustion models for compression ignition engine simulations.” 2019. Doctoral Dissertation, Georgia Tech. Accessed March 05, 2021. http://hdl.handle.net/1853/61216.

MLA Handbook (7^th Edition):

Kim, Sayop. “Advancing turbulent spray and combustion models for compression ignition engine simulations.” 2019. Web. 05 Mar 2021.

Vancouver:

Kim S. Advancing turbulent spray and combustion models for compression ignition engine simulations. [Internet] [Doctoral dissertation]. Georgia Tech; 2019. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/1853/61216.

Council of Science Editors:

Kim S. Advancing turbulent spray and combustion models for compression ignition engine simulations. [Doctoral Dissertation]. Georgia Tech; 2019. Available from: http://hdl.handle.net/1853/61216

Penn State University

24. Dean, Steven Wesley. Energetic Intermetallic Materials Formed by Cold Spray .

Degree: 2015, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/24776

► Cold spray is a recently developed particle consolidation technique that has attracted attention as a method to create structural energetic materials. These materials can be… (more)

▼ Cold spray is a recently developed particle consolidation technique that has attracted attention as a method to create structural energetic materials. These materials can be used to replace non-energetic structural components in munitions and other devices. This replacement effectively increases the energy density of the device, without the need to develop a new high explosive payload, which has historically been very challenging. These materials are also candidates for use in self-propagating high-temperature synthesis applications, where the product of the energetic reaction is a useful material itself. These reactants can be deposited in a shape near their final form using cold spray, and then ignited to form the desired product. In cold spray, particles are entrained in a carrier gas that is accelerated to high velocity through a supersonic nozzle. The high speed gas and particle stream impinges on a substrate, which the particles impact. The force of this impact is great enough that the particles adhere to the substrate and form a coating. These coatings can have densities and strengths near those of bulk material, making them potentially useful as structural components. The low gas temperatures used in cold spray differentiate it from other thermal spray techniques. These low temperatures allow particles to remain solid throughout the deposition process. This is a significant benefit, as materials that react when mixed in a molten state can be cold sprayed without reaction taking place. It is this feature that makes cold spray an attractive process for the creation of energetic materials. The energetic material used in this work is an intermetallic composed of a mixture of nickel (Ni) and aluminum (Al). The two metals are intimately mixed with each other as they are deposited, but remain heterogeneous until they are heated to the point of reaction. This intermetallic reaction is exothermic, gasless, and results in a product composed of various nickel aluminide phases, such as Al3Ni or AlNi. The goal of this work is to investigate methods to control the properties of energetic materials made using cold spray. To do this, three studies were undertaken. In the first, the effects of different feed powder microstructures on the energetic properties of cold sprayed material were explored. Cold sprayed materials were made and compared with pellets and loose powders with matching compositions. The cold sprayed samples were made using mixed Al and Ni powders as the feed material, or a powder composed of Al particles that had been coated with a Ni shell (Ni-clad Al). The materials were characterized by measuring the rate at which a reaction front propagated through the material, and the amount of heat released by the material, which was measured using differential scanning calorimetry. Results from this study showed that, in Ni-clad Al, the speed of the reaction front increased with material density and reached a maximum of 116 mm/s in the cold sprayed material. The material made with mixed Al and Ni powders showed the… Advisors/Committee Members: Richard A Yetter, Dissertation Advisor/Co-Advisor, Stephen R Turns, Committee Member, Adrianus C Van Duin, Committee Member, James Hansell Adair, Committee Member, Timothy John Eden, Special Member.

Subjects/Keywords: Cold Spray; Intermetallic; Energetic Material; Nickel; Aluminum; Combustion Synthesis; Additive Manufacturing

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APA (6^th Edition):

Dean, S. W. (2015). Energetic Intermetallic Materials Formed by Cold Spray . (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/24776

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Dean, Steven Wesley. “Energetic Intermetallic Materials Formed by Cold Spray .” 2015. Thesis, Penn State University. Accessed March 05, 2021. https://submit-etda.libraries.psu.edu/catalog/24776.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Dean, Steven Wesley. “Energetic Intermetallic Materials Formed by Cold Spray .” 2015. Web. 05 Mar 2021.

Vancouver:

Dean SW. Energetic Intermetallic Materials Formed by Cold Spray . [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Mar 05]. Available from: https://submit-etda.libraries.psu.edu/catalog/24776.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Dean SW. Energetic Intermetallic Materials Formed by Cold Spray . [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/24776

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Michigan Technological University

25. Nazemi, Mohammadreza. MODELING AND ANALYSIS OF REACTIVITY CONTROLLED COMPRESSION IGNITION (RCCI) COMBUSTION.

Degree: MS, Department of Mechanical Engineering-Engineering Mechanics, 2015, Michigan Technological University

URL: https://digitalcommons.mtu.edu/etds/956

► Homogeneous Charge Compression Ignition (HCCI) and Premixed Charge Compression Ignition (PCCI) combustion strategies are promising methods for achieving low engine-out NOx and soot emissions… (more)

▼ Homogeneous Charge Compression Ignition (HCCI) and Premixed Charge Compression Ignition (PCCI) combustion strategies are promising methods for achieving low engine-out NOx and soot emissions as well as high indicated efficiency. However, these combustion strategies have difficulties with controlling the rate of heat release and lack of an adequate combustion phasing control mechanism. A dual-fuel Reactivity Controlled Compression Ignition (RCCI) combustion strategy will address these issues due to the existence of precise means for controlling the heat release rate and combustion phasing. In the RCCI strategy two fuels with different reactivity (auto-ignition characteristics, e.g., gasoline and diesel) are blended inside the combustion chamber. Combustion phasing is controlled by the relative ratios of these two fuels and the combustion duration is controlled by the local equivalence ratio gradient between the two fuels. This thesis focuses on development of RCCI engine combustion model and understanding the effects of key parameters controlling RCCI engine combustion. This thesis includes three major modeling and analysis contributions. In the first part, a computationally efficient modeling platform is developed and validated against the experimental data. The model is able to predict start of combustion (SOC) with average error around 1 Crank Angle Degree (CAD). However, due to premixed nature of air-fuel mixture and considering the whole combustion chamber as one uniform zone, the model over predicts peak in-cylinder pressure and therefore is not capable of predicting crank angle for 50 percent mass of fuel burned (CA50) and Burn Duration (BD). Proper operation of RCCI engines requires an in-depth understanding of the interactions between fluid flows, turbulent mixing and chemical kinetics. In the second part of this thesis, a detailed 3D/Computational Fluid Dynamics (CFD) combustion model in commercial CFD code called CONVERGE is developed and validated against experimental data. In-cylinder pressure trace, combustion phasing and emissions (e.g., NOx, HC and CO) are shown to be in good agreement with experimental data for different operating conditions. In the last part, the effects of fuel injection system parameters on the performance and emissions characteristics of an RCCI engine are discussed. The injection system parameters include Premixed Ratio (PR), injection pressure, Start of Injection (SOI) timing and spray angle. The CFD model is then used to suggest an injection strategy capable of achieving optimized RCCI engine operation. Advisors/Committee Members: Mahdi Shahbakhti.

Subjects/Keywords: CFD; Combustion; Injection pressure; RCCI; SOI; Spray angle; Automotive Engineering

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APA (6^th Edition):

Nazemi, M. (2015). MODELING AND ANALYSIS OF REACTIVITY CONTROLLED COMPRESSION IGNITION (RCCI) COMBUSTION. (Masters Thesis). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etds/956

Chicago Manual of Style (16^th Edition):

Nazemi, Mohammadreza. “MODELING AND ANALYSIS OF REACTIVITY CONTROLLED COMPRESSION IGNITION (RCCI) COMBUSTION.” 2015. Masters Thesis, Michigan Technological University. Accessed March 05, 2021. https://digitalcommons.mtu.edu/etds/956.

MLA Handbook (7^th Edition):

Nazemi, Mohammadreza. “MODELING AND ANALYSIS OF REACTIVITY CONTROLLED COMPRESSION IGNITION (RCCI) COMBUSTION.” 2015. Web. 05 Mar 2021.

Vancouver:

Nazemi M. MODELING AND ANALYSIS OF REACTIVITY CONTROLLED COMPRESSION IGNITION (RCCI) COMBUSTION. [Internet] [Masters thesis]. Michigan Technological University; 2015. [cited 2021 Mar 05]. Available from: https://digitalcommons.mtu.edu/etds/956.

Council of Science Editors:

Nazemi M. MODELING AND ANALYSIS OF REACTIVITY CONTROLLED COMPRESSION IGNITION (RCCI) COMBUSTION. [Masters Thesis]. Michigan Technological University; 2015. Available from: https://digitalcommons.mtu.edu/etds/956

26. Pennisi, Michael. Characterization of 1-butanol electrospray combustion.

Degree: MS, 0133, 2012, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/31107

► This study examined the characteristics of electrosprays of 1-butanol that burn in air. Still images and high-speed movies captured with a laser sheet present helped… (more)

Subjects/Keywords: butanol; electrospray; combustion; spray

…the spray • Capture high speed movies of the combustion spray to obtain measurement of… …the Rayleigh limit for droplet fission 1.2 Spray Combustion Fundamentals Droplet combustion… …Figure 1.1 – Typical group combustion flame structure in a spray [14] A main factor… …modes of spray combustion, based on 5 Figure 1.3 – Group Combustion Modes [16] L… …spray and a diffusion flame surrounding the spray core. • External group combustion is…

10 more images…

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APA (6^th Edition):

Pennisi, M. (2012). Characterization of 1-butanol electrospray combustion. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/31107

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pennisi, Michael. “Characterization of 1-butanol electrospray combustion.” 2012. Thesis, University of Illinois – Urbana-Champaign. Accessed March 05, 2021. http://hdl.handle.net/2142/31107.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pennisi, Michael. “Characterization of 1-butanol electrospray combustion.” 2012. Web. 05 Mar 2021.

Vancouver:

Pennisi M. Characterization of 1-butanol electrospray combustion. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2012. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/2142/31107.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pennisi M. Characterization of 1-butanol electrospray combustion. [Thesis]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/31107

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of New South Wales

27. Pei, Yuanjiang. Transported PDF Modelling of Spray Combustion at Practical Diesel Engine Conditions.

Degree: Photovoltaics & Renewable Energy Engineering, 2014, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/53545 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12240/SOURCE02?view=true

► The thesis considers computational modelling targeted at spray and combustion phenomena in diesel engines. Accurate predictions of these phenomena are needed to enable timely development… (more)

▼ The thesis considers computational modelling targeted at spray and combustion phenomena in diesel engines. Accurate predictions of these phenomena are needed to enable timely development of diesel engines having lower emissions and higher efficiency. However, the modelling required stands out as a grand challenge problem, involving coupled phenomena of high Weber number spray, high Reynolds number turbulence, and complex multi-step kinetics, and having multiple combustion modes and regimes occurring in a single flame.This thesis considers among the first attempts to model diesel spray combustion with the transported probability density function (TPDF) method. The TPDF approach has significant potential to become a useful tool in the automotive industry and address the above challenges. The principal advantage of the TPDF method is that the nonlinear chemical source term appears in closed form, which is expected to be an advantage for the treatment of finite rate chemical processes such as ignition and pollutant formation. Furthermore, it does not require different modelling to be applied between different combustion modes such as ignitions, premixed flames, and nonpremixed flames; and can also, in principle, treat both slow and fast chemistry limits. The TPDF method has been demonstrated, with considerable success, mostly for gaseous atmospheric pressure laboratory flames, but prior to this thesis, demonstration for spray flames at practical diesel engine conditions has been lacking.In this thesis:• The TPDF model is demonstrated and validated against experimental spray flame databases in ambient conditions representative of diesel engines - this being among the very first efforts to address this problem. The databases chosen were n-heptane and n-dodecane spray flames in constant volume and constant flow chambers, which were available through an international collaboration known as the Engine Combustion Network.• Choices for the sub-models involved are recommended, principally the molecular mixing and chemical kinetic models. Excellent results are demonstrated with the TPDF method given appropriate submodel choices.• The importance of considering interactions of turbulence and chemistry is assessed and found to be significant, particularly in less reactive conditions. This provides guidance on whether or not these interactions should be considered in modelling, and demonstrates how they affect modelling outcomes.• Basic physical and chemical characteristics of ignition and combustion of diesel spray flames are comprehensively investigated by a detailed analysis of the TPDF results. Several experimentally observed features are reproduced and/or explained, while other new features which have as yet not been observed experimentally are also noted. Advisors/Committee Members: Hawkes, Evatt, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: Engine Combustion Network; Transported probability density function; Diesel; Spray A

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APA (6^th Edition):

Pei, Y. (2014). Transported PDF Modelling of Spray Combustion at Practical Diesel Engine Conditions. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/53545 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12240/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Pei, Yuanjiang. “Transported PDF Modelling of Spray Combustion at Practical Diesel Engine Conditions.” 2014. Doctoral Dissertation, University of New South Wales. Accessed March 05, 2021. http://handle.unsw.edu.au/1959.4/53545 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12240/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Pei, Yuanjiang. “Transported PDF Modelling of Spray Combustion at Practical Diesel Engine Conditions.” 2014. Web. 05 Mar 2021.

Vancouver:

Pei Y. Transported PDF Modelling of Spray Combustion at Practical Diesel Engine Conditions. [Internet] [Doctoral dissertation]. University of New South Wales; 2014. [cited 2021 Mar 05]. Available from: http://handle.unsw.edu.au/1959.4/53545 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12240/SOURCE02?view=true.

Council of Science Editors:

Pei Y. Transported PDF Modelling of Spray Combustion at Practical Diesel Engine Conditions. [Doctoral Dissertation]. University of New South Wales; 2014. Available from: http://handle.unsw.edu.au/1959.4/53545 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12240/SOURCE02?view=true

Colorado State University

28. Alsulami, Radi Abdulmonem. Role of physical and chemical properties of single and multicomponent liquid fuels on spray processes, flame stability, and emissions, The.

Degree: PhD, Mechanical Engineering, 2019, Colorado State University

URL: http://hdl.handle.net/10217/199865

► Ensuring reliable and clean combustion performance of IC engines, such as liquid-fueled gas turbines, is associated to our understanding of the impact of fuel composition… (more)

▼ Ensuring reliable and clean combustion performance of IC engines, such as liquid-fueled gas turbines, is associated to our understanding of the impact of fuel composition and properties, as well as the processes that the liquid fuel experiences, e.g., atomization, vaporization, turbulent mixing, and chemical kinetics, on the combustion efficiency, stability, and emissions. This understanding is a key prerequisite to the development of fuel surrogates and the deployment of alternative jet fuels. Most of the surrogate formulation activities, especially with regard to aviation fuels, have targeted only the gas-phase behavior of the real fuels, often neglecting properties responsible for atomization, vaporization, and fuel/air mixing (i.e., physical properties). In addition, much research has been done to understand the flame stability (e.g., lean blowout limit and flame liftoff height) of gaseous and pre-vaporized fuels. Thus, the optimization of the fuels and the liquid fueled combustion devices, e.g., gas turbines, requires the consideration of the two-phase process and the coupling between the complex physical and chemical processes. This will improve the understanding of the mechanisms that controls flame lean blowout limit and liftoff height of liquid fuels. Therefore, an appropriate surrogates will be formulated and a faster processes to certify the alternative fuels will be achieved. In this work, the flame stability in spray burner, quantified by flame lean blowout liftoff height, for different single, binary, alternative, and conventional fuels were experimentally measured. The flame behavior from the spray burner was compared to the results which was done using gaseous flame platform, e.g., counterflow flame burner, to clearly demonstrate the significant importance of two-phase spray processes (i.e., atomization, vaporization, and turbulent mixing) on flame stability. It was found that the atomization process, which can lead to the variation of the droplet size and distribution, has significant impact on flame stability. This is because any change in the droplet size can enhance/diminish the vaporization and mixing processes, and therefore influence the clean and efficient energy conversion process. In addition, the sensitivity of the fuels properties on flame stability was evaluated to provide an explanation for why certain fuel properties govern flame stability, such as lean blowout and liftoff height. Thus, flame stability mechanisms can be developed. A number of approaches were used in this work to address these issues, such as multiple linear regression analysis, and previously developed correlations. The results indicate the importance of the atomization process (i.e. droplet size) on the vaporization rate and suggest that the liquid fuel fraction entering the flame plays a dominant role in controlling lean blowout limits. Thus, the large droplet and less volatile fuel was the most resistance fuel to flame blowout. The differences in liftoff height was shown to be a result of two-phase flame speed, which… Advisors/Committee Members: Windom, Bret (advisor), Marchese, Anthony (committee member), Olsen, Daniel (committee member), Venayagamoorthy, Karan (committee member).

Subjects/Keywords: energy conversion; jet fuels; spray flame; flame stability; combustion; liquid fuels

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APA (6^th Edition):

Alsulami, R. A. (2019). Role of physical and chemical properties of single and multicomponent liquid fuels on spray processes, flame stability, and emissions, The. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/199865

Chicago Manual of Style (16^th Edition):

Alsulami, Radi Abdulmonem. “Role of physical and chemical properties of single and multicomponent liquid fuels on spray processes, flame stability, and emissions, The.” 2019. Doctoral Dissertation, Colorado State University. Accessed March 05, 2021. http://hdl.handle.net/10217/199865.

MLA Handbook (7^th Edition):

Alsulami, Radi Abdulmonem. “Role of physical and chemical properties of single and multicomponent liquid fuels on spray processes, flame stability, and emissions, The.” 2019. Web. 05 Mar 2021.

Vancouver:

Alsulami RA. Role of physical and chemical properties of single and multicomponent liquid fuels on spray processes, flame stability, and emissions, The. [Internet] [Doctoral dissertation]. Colorado State University; 2019. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/10217/199865.

Council of Science Editors:

Alsulami RA. Role of physical and chemical properties of single and multicomponent liquid fuels on spray processes, flame stability, and emissions, The. [Doctoral Dissertation]. Colorado State University; 2019. Available from: http://hdl.handle.net/10217/199865

University of Lund

29. Dahlström, Jessica. Experimental Investigations of Combustion Chamber Heat Transfer in a Light-Duty Diesel Engine.

Degree: 2016, University of Lund

URL: https://lup.lub.lu.se/record/9adf550d-7efa-4a70-b41c-99f913047dbd ; https://portal.research.lu.se/ws/files/7644748/Experimental_investigations_of_combustion_chamber_heat_transfer_in_a_light_duty_diesel_engine.pdf

► This work concerned experimental studies of heat transfer in a light-duty diesel engine. Combustion is affected by several parameters, such as pressure, engine speed, mass… (more)

▼ This work concerned experimental studies of heat transfer in a light-duty diesel engine. Combustion is affected by several parameters, such as pressure, engine speed, mass of injected fuel and in-cylinder gas flow. These parameters are in turn affected by the combustion chamber geometry and fuel spray characteristics. At high load the exhaust heat was increased more than at high engine speed. Swirl was found to speed up the combustion event and increased heat loss to the piston cooling, but had no measurable effect on exhaust heat loss. Exhaust gas recirculation (EGR) diverts part of the exhaust gas and mixes it with intake air. The recirculated gas acts as a heat sink and reduces in-cylinder temperatures and thus, heat losses. The air-fuel ratio is another important factor. More air resulted in faster combustion while also increasing exhaust gas temperature. Altering the combustion chamber geometry affected both in-cylinder gas flow and mixing. A more open and shallow design was found to redistribute heat losses from cooling media to exhaust. The original injectors were proven to have a higher fuel flow than the two other configurations, but faster combustion and less heat in the exhaust was mainly found with the injectors with fewest holes. Hot exhaust gases could be more useful than hot cooling media, because that heat may be extracted and used to improve engine efficiency. This reduces fuel consumption, and consequently emissions of greenhouse gases, which contribute to global warming. The world energy demand is still increasing, and more natural resources are being used. Higher efficiency requires less fuel, and thereby reduces the impact on environment and humanity. The work was performed in a 4-cylinder light-duty diesel engine. Temperatures and mass flow measurements were performed in cooling media and exhaust gas. From these calculations were executed to find out the heat fractions emitted to each medium. Two combustion chamber geometries and three injectors were tested and compared with respect to their impact on combustion and heat losses.

Subjects/Keywords: Engineering and Technology; internal combustion engines; heat transfer; diesel engine; Diesel combustion; combustion chamber geometry; piston geometry; spray parameters

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dahlström, J. (2016). Experimental Investigations of Combustion Chamber Heat Transfer in a Light-Duty Diesel Engine. (Doctoral Dissertation). University of Lund. Retrieved from https://lup.lub.lu.se/record/9adf550d-7efa-4a70-b41c-99f913047dbd ; https://portal.research.lu.se/ws/files/7644748/Experimental_investigations_of_combustion_chamber_heat_transfer_in_a_light_duty_diesel_engine.pdf

Chicago Manual of Style (16^th Edition):

Dahlström, Jessica. “Experimental Investigations of Combustion Chamber Heat Transfer in a Light-Duty Diesel Engine.” 2016. Doctoral Dissertation, University of Lund. Accessed March 05, 2021. https://lup.lub.lu.se/record/9adf550d-7efa-4a70-b41c-99f913047dbd ; https://portal.research.lu.se/ws/files/7644748/Experimental_investigations_of_combustion_chamber_heat_transfer_in_a_light_duty_diesel_engine.pdf.

MLA Handbook (7^th Edition):

Dahlström, Jessica. “Experimental Investigations of Combustion Chamber Heat Transfer in a Light-Duty Diesel Engine.” 2016. Web. 05 Mar 2021.

Vancouver:

Dahlström J. Experimental Investigations of Combustion Chamber Heat Transfer in a Light-Duty Diesel Engine. [Internet] [Doctoral dissertation]. University of Lund; 2016. [cited 2021 Mar 05]. Available from: https://lup.lub.lu.se/record/9adf550d-7efa-4a70-b41c-99f913047dbd ; https://portal.research.lu.se/ws/files/7644748/Experimental_investigations_of_combustion_chamber_heat_transfer_in_a_light_duty_diesel_engine.pdf.

Council of Science Editors:

Dahlström J. Experimental Investigations of Combustion Chamber Heat Transfer in a Light-Duty Diesel Engine. [Doctoral Dissertation]. University of Lund; 2016. Available from: https://lup.lub.lu.se/record/9adf550d-7efa-4a70-b41c-99f913047dbd ; https://portal.research.lu.se/ws/files/7644748/Experimental_investigations_of_combustion_chamber_heat_transfer_in_a_light_duty_diesel_engine.pdf

Universitat Politècnica de València

30. Pachano Prieto, Leonardo Manuel. CFD modeling of combustion and soot production in Diesel sprays .

Degree: 2020, Universitat Politècnica de València

URL: http://hdl.handle.net/10251/142189

► [ES] En los últimos años, las emisiones de hollín provenientes de los motores de combustión interna han recibido más atención debido al impacto negativo que… (more)

Subjects/Keywords: Soot modeling; Spray combustion; Computational fluid dynamics; Well-mixed; Flamelet; Diesel spray; Nozzle diameter; Residence time

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pachano Prieto, L. M. (2020). CFD modeling of combustion and soot production in Diesel sprays . (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/142189

Chicago Manual of Style (16^th Edition):

Pachano Prieto, Leonardo Manuel. “CFD modeling of combustion and soot production in Diesel sprays .” 2020. Doctoral Dissertation, Universitat Politècnica de València. Accessed March 05, 2021. http://hdl.handle.net/10251/142189.

MLA Handbook (7^th Edition):

Pachano Prieto, Leonardo Manuel. “CFD modeling of combustion and soot production in Diesel sprays .” 2020. Web. 05 Mar 2021.

Vancouver:

Pachano Prieto LM. CFD modeling of combustion and soot production in Diesel sprays . [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2020. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/10251/142189.

Council of Science Editors:

Pachano Prieto LM. CFD modeling of combustion and soot production in Diesel sprays . [Doctoral Dissertation]. Universitat Politècnica de València; 2020. Available from: http://hdl.handle.net/10251/142189

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