subject:(CAI Controlled Auto Ignition )

Loughborough University

1. Beauquel, Julien A. Numerical investigation on the in-cylinder flow with SI and CAI valve timings.

Degree: PhD, 2016, Loughborough University

► The principle of controlled auto-ignition (CAI) is to mix fuel and air homogeneously before compressing the mixture to the point of auto-ignition. As ignition occurs… (more)

▼ The principle of controlled auto-ignition (CAI) is to mix fuel and air homogeneously before compressing the mixture to the point of auto-ignition. As ignition occurs simultaneously, CAI engines operate with lean mixtures preventing high cylinder pressures. CAI engines produce small amounts of nitrogen oxides (NOx) due to low combustion temperatures while maintaining high compression ratios and engine efficiencies. Due to simultaneous combustion and lean mixtures, CAI engines are restricted between low and mid load operations. Various strategies have been studied to improve the load limit of CAI engines. The scope of the project is to investigate the consequences of varying valve timing, as a method to control the mixture temperature within the combustion chamber and therefore, controlling the mixture auto-ignition point. This study presents computational fluid dynamics (CFD) modelling results of transient flow, inside a 0.45 litre Lotus single cylinder engine. After a validation process, a chemical kinetics model is combined with the CFD code, in order to study in-cylinder temperatures, the mixture distribution during compression and to predict the auto-ignition timing. The first part of the study focuses on validating the calculated in-cylinder velocities. A mesh sensitivity study is performed as well as a comparison of different turbulence models. A method to reduce computational time of the calculations is presented. The effects of engine speed on charge delay and charge amount inside the cylinder, the development of the in-cylinder flow field and the variation of turbulence parameters during the intake and compression stroke, are studied. The second part of the study focuses on the gasoline mixture and the variation of the valve timing, to retain different ratios of residual gases within the cylinder. After validation of the model, a final set of CFD calculations is performed, to investigate the effects of valve timing on flow and the engine parameters. The results are then compared to a fully homogeneous mixture model to study the benefits of varying valve duration. New key findings and contributions to CAI knowledge were found in this investigation. Reducing the intake and exhaust valve durations created a mixture temperature stratification and a fuel concentration distribution, prior to auto-ignition. It resulted in extending the heat release rate duration, improving combustion. However, shorter valve timing durations also showed an increase in heat transfer, pumping work and friction power, with a decrease of cylinder indicated efficiency. Valve timing, as a method to control auto-ignition, should only be used when the load limit of CAI engines, is to be improved.

Subjects/Keywords: 621.43; Computational fluid dynamics; CFD; Controlled auto ignition; CAI; Engine; Combustion; Chemical kinetics; Laser doppler anemometry; LDA; Homogeneous charge compression ignition; HCCI

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

APA (6^th Edition):

Beauquel, J. A. (2016). Numerical investigation on the in-cylinder flow with SI and CAI valve timings. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/21548

Chicago Manual of Style (16^th Edition):

Beauquel, Julien A. “Numerical investigation on the in-cylinder flow with SI and CAI valve timings.” 2016. Doctoral Dissertation, Loughborough University. Accessed January 22, 2021. http://hdl.handle.net/2134/21548.

MLA Handbook (7^th Edition):

Beauquel, Julien A. “Numerical investigation on the in-cylinder flow with SI and CAI valve timings.” 2016. Web. 22 Jan 2021.

Vancouver:

Beauquel JA. Numerical investigation on the in-cylinder flow with SI and CAI valve timings. [Internet] [Doctoral dissertation]. Loughborough University; 2016. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2134/21548.

Council of Science Editors:

Beauquel JA. Numerical investigation on the in-cylinder flow with SI and CAI valve timings. [Doctoral Dissertation]. Loughborough University; 2016. Available from: http://hdl.handle.net/2134/21548

Universitat Politècnica de València

2. Valero Marco, Jorge. Analysis of the potential of SI lean combustion and CAI combustion in a two-stroke spark-assisted gasoline engine .

Degree: 2020, Universitat Politècnica de València

URL: http://hdl.handle.net/10251/138556

► [EN] Internal combustion engines are in a situation in which they must be cleaner and more efficient than they have ever been. This change is… (more)

▼ [EN] Internal combustion engines are in a situation in which they must be cleaner and more efficient than they have ever been. This change is motivated by the global and continuous evolution of the emissions regulations linked to their commercialization, which try to establish the path to protect the human health, and move towards more sustainable energetic models. Framed in this context, the research work developed in this PhD thesis has focused on the way to continue improving the spark ignition engines. To this end, a prototype two-stroke engine has been used, with the idea of studying the Spark Ignited combustion in lean conditions ('lean SI') and the Controlled Auto-Ignition combustion 'CAI'). In this way, the traditional 'SI' operation in stoichiometric conditions of this type of engines is replaced, looking for an improvement in fuel efficiency, and a reduction, at the same time, of the pollutant emissions. This work has been approached mainly from an experimental point of view. Firstly, different works have been performed on the engine: operation of the different combustion modes, definition of the operating strategies, and compilation of experimental data coming from the engine operation in the different regions of the engine map. And, secondly, all this data has been analyzed and studied in detail to define the strengths and weaknesses of each combustion mode applied to the different engine operating conditions. The combination of these two works has led to obtain a large amount of data about the achievable efficiencies and the emissions values obtained in each combustion mode. And, in addition, the influence on the combustion of the burned gases recirculation in the engine ('EGR'), has also been studied as a strategy to reduce emissions, and control the combustion at high loads in both combustion modes. Regarding the analytical part of the work, several problems have been detected. Firstly, the high combustion variability in this engine, and secondly, the coupling of two completely different combustion modes. These issues have generated the need to analyze the data obtained in a more detailed way, in order to get more information about the combustion process. To solve these two aspects, first, a different point of view has been raised when dealing with the combustion diagnosis, the cycle to cycle analysis, and secondly, a combustion analysis methodology has been proposed in order to allow the combustion analysis from a more detailed point of view. In this way the combustion development is studied, and thus, the differentiation between the different combustion events that take place in the engine can be studied. All this work has been useful to define the strategies to operate the whole engine map by combining the 'lean SI' and 'CAI' combustion modes. This solution, compared to the current Euro VI engines, has presented higher efficiency values complying with the established emissions limits, showing in this way, the high potential of these combustion modes applied to 'SI' engines, as well as a real… Advisors/Committee Members: López Sánchez, José Javier (advisor).

Subjects/Keywords: Two-stoke engine; engines developement; CAI (Controlled Auto-Ignition); SI (Spark Ignition); Lean Combustion; advanced combustion modes; combustion analysis; instantaneous cycles; cycle to cycle variation; air-assisted injection; HRL (Heat Release Law); combustion speed.

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APA (6^th Edition):

Valero Marco, J. (2020). Analysis of the potential of SI lean combustion and CAI combustion in a two-stroke spark-assisted gasoline engine . (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/138556

Chicago Manual of Style (16^th Edition):

Valero Marco, Jorge. “Analysis of the potential of SI lean combustion and CAI combustion in a two-stroke spark-assisted gasoline engine .” 2020. Doctoral Dissertation, Universitat Politècnica de València. Accessed January 22, 2021. http://hdl.handle.net/10251/138556.

MLA Handbook (7^th Edition):

Valero Marco, Jorge. “Analysis of the potential of SI lean combustion and CAI combustion in a two-stroke spark-assisted gasoline engine .” 2020. Web. 22 Jan 2021.

Vancouver:

Valero Marco J. Analysis of the potential of SI lean combustion and CAI combustion in a two-stroke spark-assisted gasoline engine . [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2020. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10251/138556.

Council of Science Editors:

Valero Marco J. Analysis of the potential of SI lean combustion and CAI combustion in a two-stroke spark-assisted gasoline engine . [Doctoral Dissertation]. Universitat Politècnica de València; 2020. Available from: http://hdl.handle.net/10251/138556

Colorado State University

3. Bayliff, Scott Michael. Evaluation of controlled end gas auto ignition with exhaust gas recirculation in a stoichiometric, spark ignited, natural gas engine.

Degree: MS(M.S.), Mechanical Engineering, 2020, Colorado State University

URL: http://hdl.handle.net/10217/208468

► Many stationary and heavy-duty on-road natural gas fueled engines today operate under stoichiometric conditions with a three-way catalyst. The disadvantage of stoichiometric natural gas engines… (more)

▼ Many stationary and heavy-duty on-road natural gas fueled engines today operate under stoichiometric conditions with a three-way catalyst. The disadvantage of stoichiometric natural gas engines compared to lean-burn natural gas and diesel engines is lower efficiency, resulting primarily from lower power density and compression ratio. Exhaust gas recirculation (EGR) coupled with advanced combustion controls can enable operation with higher compression ratio and power density, which yields higher efficiency. This also results in engine operation between the limits of knock and misfire. Operation between these limits has been named controlled end gas auto-ignition (C-EGAI) and can be used to improve the brake efficiency of the engine. Various methods of cylinder pressure-based knock quantification were explored to implement C-EGAI. The indicated quantification methods are used for the implementation of a control scheme for C-EGAI with a relation to the fractional heat release due to auto-ignition. A custom EGR system was built and the effect of EGR on the performance of a stoichiometric, spark ignited, natural gas engine is evaluated. C-EGAI is implemented and the optimal parameters are determined for peak performance under EGR and C-EGAI conditions. In this study, knock detection is used for the recognition, magnitude, and location of the auto-ignition events. Cylinder pressure-based knock detection was the primary method for determining the occurrence and location of knock but was also used for implementing the ignition control scheme for controlled end gas auto-ignition. The combustion intensity metric (CIM) enabled parametric ignition timing control which allowed for the creation of a relationship between fractional heat release due to auto-ignition and CIM. Both exhaust gas recirculation and controlled end gas auto-ignition were analyzed with a cooperative fuel research (CFR) engine modified for boosted fuel/air intake. The data was interpreted to provide a proper evaluation of unique analytical methods to quantify the results of C_EGAI and characterize the live auto-ignition events. The control variables for this method of C-EGAI were optimized with EGR conditions to generate the point of peak performance on the CFR engine under stoichiometric, spark ignited, natural gas conditions. Advisors/Committee Members: Olsen, Daniel B. (advisor), Windom, Bret (committee member), Baker, Daniel (committee member).

Subjects/Keywords: cooperative fuel research engine; exhaust gas recirculation; controlled end gas auto ignition; stoichiometric; engine knock

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APA (6^th Edition):

Bayliff, S. M. (2020). Evaluation of controlled end gas auto ignition with exhaust gas recirculation in a stoichiometric, spark ignited, natural gas engine. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/208468

Chicago Manual of Style (16^th Edition):

Bayliff, Scott Michael. “Evaluation of controlled end gas auto ignition with exhaust gas recirculation in a stoichiometric, spark ignited, natural gas engine.” 2020. Masters Thesis, Colorado State University. Accessed January 22, 2021. http://hdl.handle.net/10217/208468.

MLA Handbook (7^th Edition):

Bayliff, Scott Michael. “Evaluation of controlled end gas auto ignition with exhaust gas recirculation in a stoichiometric, spark ignited, natural gas engine.” 2020. Web. 22 Jan 2021.

Vancouver:

Bayliff SM. Evaluation of controlled end gas auto ignition with exhaust gas recirculation in a stoichiometric, spark ignited, natural gas engine. [Internet] [Masters thesis]. Colorado State University; 2020. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10217/208468.

Council of Science Editors:

Bayliff SM. Evaluation of controlled end gas auto ignition with exhaust gas recirculation in a stoichiometric, spark ignited, natural gas engine. [Masters Thesis]. Colorado State University; 2020. Available from: http://hdl.handle.net/10217/208468

4. Techer, Anthony. Simulation aux grandes échelles implicite et explicite de la combustion supersonique : Implicit and Explicit Large-Eddy Simulation of Supersonic Combustion.

Degree: Docteur es, Energétique, thermique, combustion, 2017, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique

URL: http://www.theses.fr/2017ESMA0020

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Cette Thèse de doctorat est consacrée à l’étude, par simulation aux grandes échelles ou LES (Larg eeddy simulation), d’un jet pariétal d’hydrogène sous-détendu dans un… (more)

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Cette Thèse de doctorat est consacrée à l’étude, par simulation aux grandes échelles ou LES (Larg eeddy simulation), d’un jet pariétal d’hydrogène sous-détendu dans un écoulement transverse supersonique d’air vicié. Cette configuration est représentative des conditions d’écoulement rencontrées dans les moteurs aérobies de type super-statoréacteurs (scramjets). En effet, les futurs systèmes de transport à grande vitesse dépendent fortement du développement de ce type de moteur. Dans de telles conditions, l’écoulement d’air chaud est maintenu supersonique dans la chambre de combustion afin de réduire les effets induits par l’échauffement et la dissociation de l’air. Nous étudions les processus de mélange et de combustion qui se développent en aval du jet de combustible. Ce travail s’appuie sur l’emploi d’un outil de simulation numérique haute fidélité : CREAMS (Compressible REActive Multi-species Solver) développé à l’Institut Pprime. Ce code de calcul met en oeuvre des schémas numériques d’ordre élevé : schéma Runge–Kutta d’ordre 3 pour l’intégration temporelle combiné à un schéma WENO d’ordre 7 et centré d’ordre 8 pour la discrétisation spatiale. Les simulations réalisées dans des conditions inertes permettent de caractériser l’importance des interactions choc/turbulence avec une attention particulière accordée à la description des fluctuations de composition à l’échelle non-résolue (i.e. sous-maille). Compte tenu de leur niveau de résolution,les simulations réactives permettent quant à elles une analyse détaillée du mode de stabilisation et des régimes de combustion turbulente rencontrés fournissant ainsi des informations très précieuses quant à l’adéquation des modélisations existantes pour ces conditions extrêmes.

This dissertation is devoted to the Large-eddy simulation (LES) study of a wall hydrogen underexpanded jet in a supersonic crossflow of vitiated air. This configuration is representative of flow conditions encountered in aerospace engines such as supersonic combustion ramjet (scramjets). Indeed, future of high-speed transport systems heavily depends on the development of this type of engine. Under such conditions, the high temperature flow of vitiated air is maintained supersonic in the combustion chamber to reduce effects of heating and dissociation. The mixing and combustion processes that develop downstream of the fuel jet are studied. This work is based on the use of a high fidelity numerical simulation: CREAMS (Compressible REActive Multi-species Solver) which is developed at the Pprime Institute. This computational solver makes use of high precision numerical schemes: a 3rd order Runge–Kutta scheme for the time integration combines with a 7th order WENO and 8th order centered scheme for the spatial discretisation. Non-reactive simulations allow to characterize the importance of shock/turbulence interactions with special attention paid to the description of the unresolved (i.e. sub-grid scale) scalar fluctuations. The reactive simulations allow to perform a detailed analysis of the stabilization…

Advisors/Committee Members: Mura, Arnaud (thesis director), Lehnasch, Guillaume (thesis director).

Subjects/Keywords: Auto-allumage; Auto-ignition

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

APA (6^th Edition):

Techer, A. (2017). Simulation aux grandes échelles implicite et explicite de la combustion supersonique : Implicit and Explicit Large-Eddy Simulation of Supersonic Combustion. (Doctoral Dissertation). Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique. Retrieved from http://www.theses.fr/2017ESMA0020

Chicago Manual of Style (16^th Edition):

Techer, Anthony. “Simulation aux grandes échelles implicite et explicite de la combustion supersonique : Implicit and Explicit Large-Eddy Simulation of Supersonic Combustion.” 2017. Doctoral Dissertation, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique. Accessed January 22, 2021. http://www.theses.fr/2017ESMA0020.

MLA Handbook (7^th Edition):

Techer, Anthony. “Simulation aux grandes échelles implicite et explicite de la combustion supersonique : Implicit and Explicit Large-Eddy Simulation of Supersonic Combustion.” 2017. Web. 22 Jan 2021.

Vancouver:

Techer A. Simulation aux grandes échelles implicite et explicite de la combustion supersonique : Implicit and Explicit Large-Eddy Simulation of Supersonic Combustion. [Internet] [Doctoral dissertation]. Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; 2017. [cited 2021 Jan 22]. Available from: http://www.theses.fr/2017ESMA0020.

Council of Science Editors:

Techer A. Simulation aux grandes échelles implicite et explicite de la combustion supersonique : Implicit and Explicit Large-Eddy Simulation of Supersonic Combustion. [Doctoral Dissertation]. Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; 2017. Available from: http://www.theses.fr/2017ESMA0020

Brunel University

5. Martins, Mario Eduardo Santos. Investigation of performance and characteristics of a multi-cylinder gasoline engine with controlled auto-ignition combustion in naturally aspirated and boosted operation.

Degree: PhD, 2007, Brunel University

URL: http://bura.brunel.ac.uk/handle/2438/7915 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.573924

► Controlled Auto-Ignition (CAI) also known as Homogeneous Charge Compression Ignition (HCCI) is increasingly seen as a very effective way of lowering both fuel consumption and… (more)

Subjects/Keywords: 629.2; Controlled auto-ignition : Homogenous charge compression : Multi-cylinder gasoline engine : Fuel emission

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APA (6^th Edition):

Martins, M. E. S. (2007). Investigation of performance and characteristics of a multi-cylinder gasoline engine with controlled auto-ignition combustion in naturally aspirated and boosted operation. (Doctoral Dissertation). Brunel University. Retrieved from http://bura.brunel.ac.uk/handle/2438/7915 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.573924

Chicago Manual of Style (16^th Edition):

Martins, Mario Eduardo Santos. “Investigation of performance and characteristics of a multi-cylinder gasoline engine with controlled auto-ignition combustion in naturally aspirated and boosted operation.” 2007. Doctoral Dissertation, Brunel University. Accessed January 22, 2021. http://bura.brunel.ac.uk/handle/2438/7915 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.573924.

MLA Handbook (7^th Edition):

Martins, Mario Eduardo Santos. “Investigation of performance and characteristics of a multi-cylinder gasoline engine with controlled auto-ignition combustion in naturally aspirated and boosted operation.” 2007. Web. 22 Jan 2021.

Vancouver:

Martins MES. Investigation of performance and characteristics of a multi-cylinder gasoline engine with controlled auto-ignition combustion in naturally aspirated and boosted operation. [Internet] [Doctoral dissertation]. Brunel University; 2007. [cited 2021 Jan 22]. Available from: http://bura.brunel.ac.uk/handle/2438/7915 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.573924.

Council of Science Editors:

Martins MES. Investigation of performance and characteristics of a multi-cylinder gasoline engine with controlled auto-ignition combustion in naturally aspirated and boosted operation. [Doctoral Dissertation]. Brunel University; 2007. Available from: http://bura.brunel.ac.uk/handle/2438/7915 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.573924

Wayne State University

6. Joshi, Umashankar M. Quantification Of Auto-Ignition In Diesel Engines.

Degree: PhD, Mechanical Engineering, 2015, Wayne State University

URL: https://digitalcommons.wayne.edu/oa_dissertations/1341

► Efforts have been made previously by researchers to quantify the auto-ignition quality of fuels by calculating global activation energy using Arrhenius plots with data… (more)

▼ Efforts have been made previously by researchers to quantify the auto-ignition quality of fuels by calculating global activation energy using Arrhenius plots with data measured for the ignition delay period (ID). Large variation in the activation energy of fuels has been observed even for fuels with closer CN values. More recently, the activation energy values obtained by Kook et al in (2005) on an optical engine do not agree with data obtained in an identical metallic engine by Jayakumar using fuels of same CN. The disparity in their results can be attributed to the differences in ignition delay (ID) and effective temperature definitions used. Most researchers agree upon the start of ID time as the start of injection (SOI). The main point of disagreement has been in defining the end of ID period which is considered to be the start of combustion (SOC). As a result, numerous definitions for the ID period have been used by researchers which lead to variation in calculation of activation energy value. In addition, in heterogeneous combustion equipment to account for changes in charge temperature due to fuel evaporation and piston movement (in engines) an effective temperature value is used. Different definitions for the effective temperature have been reported in the literature. This leads to more variations in the activation energy value calculation. Furthermore, it was observed that engine test conditions and the temperature regime in which the tests are done would also affect the calculation of activation energy value. This dissertation examines the effects of ignition delay definitions, effective temperatures, engine conditions and temperature regimes on the global activation energy. Moreover, homogeneous charge test data has shown presence of a NTC regime in which the activation energy value can be either positive, negative or zero. However, heterogeneous test data from literature has always shown positive values for activation energy. This dissertation has also explained the reasons behind such a behavior. Advisors/Committee Members: Naeim A. Henein.

Subjects/Keywords: Activation energy; Arrhenius plots; Auto-ignition; Diesel combustion; Ignition delay; Ignition delay correlation; Mechanical Engineering

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

APA (6^th Edition):

Joshi, U. M. (2015). Quantification Of Auto-Ignition In Diesel Engines. (Doctoral Dissertation). Wayne State University. Retrieved from https://digitalcommons.wayne.edu/oa_dissertations/1341

Chicago Manual of Style (16^th Edition):

Joshi, Umashankar M. “Quantification Of Auto-Ignition In Diesel Engines.” 2015. Doctoral Dissertation, Wayne State University. Accessed January 22, 2021. https://digitalcommons.wayne.edu/oa_dissertations/1341.

MLA Handbook (7^th Edition):

Joshi, Umashankar M. “Quantification Of Auto-Ignition In Diesel Engines.” 2015. Web. 22 Jan 2021.

Vancouver:

Joshi UM. Quantification Of Auto-Ignition In Diesel Engines. [Internet] [Doctoral dissertation]. Wayne State University; 2015. [cited 2021 Jan 22]. Available from: https://digitalcommons.wayne.edu/oa_dissertations/1341.

Council of Science Editors:

Joshi UM. Quantification Of Auto-Ignition In Diesel Engines. [Doctoral Dissertation]. Wayne State University; 2015. Available from: https://digitalcommons.wayne.edu/oa_dissertations/1341

University of Colorado

7. Cameron, Drew Morales. Autoignition Studies of Gasoline Surrogate Fuels in the Advanced Fuel Ignition Delay Analyzer.

Degree: MS, Mechanical Engineering, 2017, University of Colorado

URL: https://scholar.colorado.edu/mcen_gradetds/150

► Improving vehicle efficiency is a substantial way to reduce CO₂ emissions from the transportation sector. The most limiting factor of spark ignition (SI) gasoline engine… (more)

Subjects/Keywords: auto-ignition; combustion; fuel; gasoline surrogate; ignition kinetics; spark ignition engine; Advanced Fuel Ignition Delay Analyzer (AFIDA); Chemistry; Mechanical Engineering

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APA (6^th Edition):

Cameron, D. M. (2017). Autoignition Studies of Gasoline Surrogate Fuels in the Advanced Fuel Ignition Delay Analyzer. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/mcen_gradetds/150

Chicago Manual of Style (16^th Edition):

Cameron, Drew Morales. “Autoignition Studies of Gasoline Surrogate Fuels in the Advanced Fuel Ignition Delay Analyzer.” 2017. Masters Thesis, University of Colorado. Accessed January 22, 2021. https://scholar.colorado.edu/mcen_gradetds/150.

MLA Handbook (7^th Edition):

Cameron, Drew Morales. “Autoignition Studies of Gasoline Surrogate Fuels in the Advanced Fuel Ignition Delay Analyzer.” 2017. Web. 22 Jan 2021.

Vancouver:

Cameron DM. Autoignition Studies of Gasoline Surrogate Fuels in the Advanced Fuel Ignition Delay Analyzer. [Internet] [Masters thesis]. University of Colorado; 2017. [cited 2021 Jan 22]. Available from: https://scholar.colorado.edu/mcen_gradetds/150.

Council of Science Editors:

Cameron DM. Autoignition Studies of Gasoline Surrogate Fuels in the Advanced Fuel Ignition Delay Analyzer. [Masters Thesis]. University of Colorado; 2017. Available from: https://scholar.colorado.edu/mcen_gradetds/150

8. Tudorache, Diana Elena. Tabulation de la cinétique chimique pour la prédiction des polluants dans les moteurs à combustion interne : Chemical kinetics tabulation for pollutants prediction in internal combustion engines.

Degree: Docteur es, Energétique, 2013, Châtenay-Malabry, Ecole centrale de Paris

URL: http://www.theses.fr/2013ECAP0024

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Les responsabilités environnementales font que les constructeurs automobiles visent à acquérir des connaissances approfondies sur les phénomènes physico-chimiques des chambres de combustion des moteurs pour… (more)

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Les responsabilités environnementales font que les constructeurs automobiles visent à acquérir des connaissances approfondies sur les phénomènes physico-chimiques des chambres de combustion des moteurs pour la compréhension et le contrôle des émissions polluantes. En dépit des performances remarquables dans le domaine du calcul numérique intensif de très haute performance, les simulations numériques des chambres de combustion des moteurs à combustion interne ne permettent pas encore une description détaillée des processus chimiques. L’objectif de ces travaux est d’améliorer les modèles de combustion turbulente basés sur la Simulation aux Grandes Echelles en développant une méthode de tabulation de la cinétique chimique représentative de la combustion dans un cycle moteur. Une attention toute particulière est portée sur la capacité de la méthode de tabulation à reproduire la formation des espèces polluantes lors des phases de compression, d’auto-allumage et de détente d’un moteur à combustion interne. Cette méthode suppose que la chimie dans une chambre de combustion interne peut être approchée par une tabulation des résultats issus de calculs de réacteurs isochores 0-D, les coordonnées de la table étant: la variable de progrès, l’énergie et la masse volumique. La capacité prédictive de la technique de tabulation a été testée par des simulations d’auto-allumage en volume variable. La méthode de tabulation "Tabulated Thermo Chemistry" (TTC) a été initialement développée pour coupler la cinétique chimique à des solveurs Navier-Stokes compressibles dans des situations d’écoulement à faible nombre de Mach. Dans ce travail, la méthode TTC a été adaptée pour la combustion à pression variable. Une version TTC dédiée à la combustion dans les moteurs est donc implantée dans un code instationnaire LES compressible. La méthode de couplage a été testée avec succès tant sur des configurations simplifiées que sur une Machine à Compression Rapide.

Due to environmental concerns, automotive manufacturers aim at acquiring knowledge of physical and chemical phenomena inside the combustion chamber to understand and control pollutant emissions. Despite the outstanding performances in the domain of high performance intensive numerical calculation, the numerical simulations of the combustion chambers of the internal combustion engines do not allow a detailed description of the chemical processes. The present study aims to improve the turbulent combustion models based on Large Eddy Simulation approach by developing an efficient cost cutting tabulation method to fit chemistry in engine combustion modeling. A particular attention is paid to the capacity of the tabulation method to reproduce the pollutant species formation during the compression stroke, the reaction phase, and the power stroke of an ICE. This method assumes that IC engine chemistry can be mapped by a collection of 0-D reactor computation data, using for coordinates: the progress variable, the energy and the density. In a first step, the chemical prediction capability of this…

Advisors/Committee Members: Darabiha, Nasser (thesis director).

Subjects/Keywords: Combustion; Auto-allumage; Tabulation de la cinétique chimique; Combustion; Auto-ignition; Tabulated chemistry

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APA (6^th Edition):

Tudorache, D. E. (2013). Tabulation de la cinétique chimique pour la prédiction des polluants dans les moteurs à combustion interne : Chemical kinetics tabulation for pollutants prediction in internal combustion engines. (Doctoral Dissertation). Châtenay-Malabry, Ecole centrale de Paris. Retrieved from http://www.theses.fr/2013ECAP0024

Chicago Manual of Style (16^th Edition):

Tudorache, Diana Elena. “Tabulation de la cinétique chimique pour la prédiction des polluants dans les moteurs à combustion interne : Chemical kinetics tabulation for pollutants prediction in internal combustion engines.” 2013. Doctoral Dissertation, Châtenay-Malabry, Ecole centrale de Paris. Accessed January 22, 2021. http://www.theses.fr/2013ECAP0024.

MLA Handbook (7^th Edition):

Tudorache, Diana Elena. “Tabulation de la cinétique chimique pour la prédiction des polluants dans les moteurs à combustion interne : Chemical kinetics tabulation for pollutants prediction in internal combustion engines.” 2013. Web. 22 Jan 2021.

Vancouver:

Tudorache DE. Tabulation de la cinétique chimique pour la prédiction des polluants dans les moteurs à combustion interne : Chemical kinetics tabulation for pollutants prediction in internal combustion engines. [Internet] [Doctoral dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2013. [cited 2021 Jan 22]. Available from: http://www.theses.fr/2013ECAP0024.

Council of Science Editors:

Tudorache DE. Tabulation de la cinétique chimique pour la prédiction des polluants dans les moteurs à combustion interne : Chemical kinetics tabulation for pollutants prediction in internal combustion engines. [Doctoral Dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2013. Available from: http://www.theses.fr/2013ECAP0024

University of Lund

9. Truedsson, Ida. The HCCI Fuel Number - Measuring and Describing Auto-ignition for HCCI Combustion Engines.

Degree: 2014, University of Lund

URL: https://lup.lub.lu.se/record/4378685 ; https://portal.research.lu.se/ws/files/3962370/4378736.pdf

► HCCI is an advanced combustion concept, using premixed fuel and air with a diluted charge. This is thermodynamically favorable, leading to high efficiency and therefore… (more)

▼ HCCI is an advanced combustion concept, using premixed fuel and air with a diluted charge. This is thermodynamically favorable, leading to high efficiency and therefore lower CO2 emissions. The well-premixed and diluted fuel charge gives lower cylinder temperatures than conventional diesel compression ignition and spark ignited gasoline combustion, resulting in low engine out emissions of both nitrogen oxides and soot. To be able to optimize and use the advanced combustion concepts in commercial engines, knowledge of fuel behavior is needed, and a way to describe it. This thesis work provides detailed information about HCCI auto-ignition by studying parameters such as low temperature heat release and auto-ignition temperatures. An HCCI Fuel Number is presented, developed with the purpose to describe fuel performance. By comparing fuels such as full distillate gasolines or biofuels to the required compression ratio for auto-ignition for reference fuels, a measure on HCCI fuel performance is gained. This fuel number was shown to correlate well with pre-reactions in the fuels. The thesis work is based on CFR engine experiments, studying over 40 different reference fuels consisting of blends of n-heptane, iso-octane, toluene, and ethanol, which are model surrogates for gasoline. In addition, 21 different full distillate gasoline fuels prepared from refinery feedstocks, some with addition of single components, were tested as well. Five different inlet air temperatures ranging from 50°C to 150°C were used to achieve different temperature-pressure histories, and the compression ratio was changed accordingly to keep a constant combustion phasing, CA50, of 3±1° after TDC. The main parts of the experiments were carried out in lean operation with a constant equivalence ratio of 0.33 and with an engine speed of 600 rpm. Additional experiments were performed at higher engine speeds. Studied fuel effects include low temperature heat release quenching effects, were ethanol was found to quench low temperature heat release at all conditions, and toluene had an in comparison very weak effect on these pre-reactions. All conditions and fuels with extensive low temperature heat release showed similar auto-ignition temperatures. When LTHR diminished, either due to fuel quenching from ethanol or toluene, or when the inlet air temperature was increased, the auto-ignition temperature was increased.

Subjects/Keywords: Energy Engineering; Fuel; Combustion Engines; HCCI; Auto-ignition

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APA (6^th Edition):

Truedsson, I. (2014). The HCCI Fuel Number - Measuring and Describing Auto-ignition for HCCI Combustion Engines. (Doctoral Dissertation). University of Lund. Retrieved from https://lup.lub.lu.se/record/4378685 ; https://portal.research.lu.se/ws/files/3962370/4378736.pdf

Chicago Manual of Style (16^th Edition):

Truedsson, Ida. “The HCCI Fuel Number - Measuring and Describing Auto-ignition for HCCI Combustion Engines.” 2014. Doctoral Dissertation, University of Lund. Accessed January 22, 2021. https://lup.lub.lu.se/record/4378685 ; https://portal.research.lu.se/ws/files/3962370/4378736.pdf.

MLA Handbook (7^th Edition):

Truedsson, Ida. “The HCCI Fuel Number - Measuring and Describing Auto-ignition for HCCI Combustion Engines.” 2014. Web. 22 Jan 2021.

Vancouver:

Truedsson I. The HCCI Fuel Number - Measuring and Describing Auto-ignition for HCCI Combustion Engines. [Internet] [Doctoral dissertation]. University of Lund; 2014. [cited 2021 Jan 22]. Available from: https://lup.lub.lu.se/record/4378685 ; https://portal.research.lu.se/ws/files/3962370/4378736.pdf.

Council of Science Editors:

Truedsson I. The HCCI Fuel Number - Measuring and Describing Auto-ignition for HCCI Combustion Engines. [Doctoral Dissertation]. University of Lund; 2014. Available from: https://lup.lub.lu.se/record/4378685 ; https://portal.research.lu.se/ws/files/3962370/4378736.pdf

University of Ottawa

10. Sabourin, Shaun. Auto-Ignition of Liquid n-Paraffin Fuels Mixtures as Single Droplets Using Continuous Thermodynamics .

Degree: 2011, University of Ottawa

URL: http://hdl.handle.net/10393/20135

► This thesis reports a model to predict the auto-ignition time of single droplets of n-paraffin fuel mixtures using the method of continuous thermodynamics. The model… (more)

Subjects/Keywords: Auto Ignition; n-paraffin fuels; mixtures; single droplets; continuous thermodynamics; chemical rate equation; arrhenius rate equation; droplet combustion; droplet ignition; model

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APA (6^th Edition):

Sabourin, S. (2011). Auto-Ignition of Liquid n-Paraffin Fuels Mixtures as Single Droplets Using Continuous Thermodynamics . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/20135

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):

Sabourin, Shaun. “Auto-Ignition of Liquid n-Paraffin Fuels Mixtures as Single Droplets Using Continuous Thermodynamics .” 2011. Thesis, University of Ottawa. Accessed January 22, 2021. http://hdl.handle.net/10393/20135.

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

MLA Handbook (7^th Edition):

Sabourin, Shaun. “Auto-Ignition of Liquid n-Paraffin Fuels Mixtures as Single Droplets Using Continuous Thermodynamics .” 2011. Web. 22 Jan 2021.

Vancouver:

Sabourin S. Auto-Ignition of Liquid n-Paraffin Fuels Mixtures as Single Droplets Using Continuous Thermodynamics . [Internet] [Thesis]. University of Ottawa; 2011. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10393/20135.

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

Council of Science Editors:

Sabourin S. Auto-Ignition of Liquid n-Paraffin Fuels Mixtures as Single Droplets Using Continuous Thermodynamics . [Thesis]. University of Ottawa; 2011. Available from: http://hdl.handle.net/10393/20135

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

NSYSU

11. Wang, Jen-Chung. On-Line Compuer Aided Instruction and Numerical Tool of Particle Dynamics.

Degree: Master, Physics, 2000, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0706100-231910

► We develop on-line Java applets of Particle Dynamics in which user can construct their own physical system, such as the number of the particles, initial… (more)

Subjects/Keywords: cai

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APA (6^th Edition):

Wang, J. (2000). On-Line Compuer Aided Instruction and Numerical Tool of Particle Dynamics. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0706100-231910

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):

Wang, Jen-Chung. “On-Line Compuer Aided Instruction and Numerical Tool of Particle Dynamics.” 2000. Thesis, NSYSU. Accessed January 22, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0706100-231910.

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

MLA Handbook (7^th Edition):

Wang, Jen-Chung. “On-Line Compuer Aided Instruction and Numerical Tool of Particle Dynamics.” 2000. Web. 22 Jan 2021.

Vancouver:

Wang J. On-Line Compuer Aided Instruction and Numerical Tool of Particle Dynamics. [Internet] [Thesis]. NSYSU; 2000. [cited 2021 Jan 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0706100-231910.

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

Council of Science Editors:

Wang J. On-Line Compuer Aided Instruction and Numerical Tool of Particle Dynamics. [Thesis]. NSYSU; 2000. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0706100-231910

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

Loughborough University

12. Milovanović, Nebojša. A study of controlled auto ignition (CAI) combustion in internal combustion engines.

Degree: PhD, 2003, Loughborough University

URL: http://hdl.handle.net/2134/19906

► Controlled Auto Ignition (CAI) combustion is a new combustion principle in internal combustion engines which has in recent years attracted increased attention. In CAI combustion,… (more)

Subjects/Keywords: 629.254; CAI; HCCI; PCCI; Chemical kinetics; Auto-ignition; Heat release rate; Fuel composition; Engine parameters; Internal exhaust gas recirculation; IEGR; Gas exchange process; Variable valve timings; Commercial gasoline; N-heptane; Iso-octane; Ethanol; Methane; Dimethyl ether; Bio-diesel fuel; RON

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APA (6^th Edition):

Milovanović, N. (2003). A study of controlled auto ignition (CAI) combustion in internal combustion engines. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/19906

Chicago Manual of Style (16^th Edition):

Milovanović, Nebojša. “A study of controlled auto ignition (CAI) combustion in internal combustion engines.” 2003. Doctoral Dissertation, Loughborough University. Accessed January 22, 2021. http://hdl.handle.net/2134/19906.

MLA Handbook (7^th Edition):

Milovanović, Nebojša. “A study of controlled auto ignition (CAI) combustion in internal combustion engines.” 2003. Web. 22 Jan 2021.

Vancouver:

Milovanović N. A study of controlled auto ignition (CAI) combustion in internal combustion engines. [Internet] [Doctoral dissertation]. Loughborough University; 2003. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2134/19906.

Council of Science Editors:

Milovanović N. A study of controlled auto ignition (CAI) combustion in internal combustion engines. [Doctoral Dissertation]. Loughborough University; 2003. Available from: http://hdl.handle.net/2134/19906

University of Minnesota

13. Fang, Wei. An Experimental Investigation Of Reactivity-Controlled Compression Ignition Combustion In Diesel Engines Using Hydrous Ethanol.

Degree: PhD, Mechanical Engineering, 2016, University of Minnesota

URL: http://hdl.handle.net/11299/182265

► This thesis presents a systematic investigation of advanced dual-fuel low temperature combustion (LTC) strategy, reactivity-controlled compression ignition (RCCI), on a modified diesel engine to obtain… (more)

▼ This thesis presents a systematic investigation of advanced dual-fuel low temperature combustion (LTC) strategy, reactivity-controlled compression ignition (RCCI), on a modified diesel engine to obtain high thermal efficiency and low engine-out emissions using hydrous ethanol as the primary fuel. Direct use of hydrous ethanol in internal combustion engines has been shown to provide significant energy savings in the bio-ethanol production process, substantially improving life-cycle energy use and economics compared to commercially available anhydrous ethanol. While many studies have reported high thermal efficiency and extremely low soot and NOX emissions without exhaust aftertreatment systems in RCCI engines fueled with petroleum-based fuels, limited work has been done regarding the characteristics of performance and emissions of RCCI operation using hydrous ethanol. In this work, a systematic experimental investigation has been conducted to explore the operability region, characterize the performance and emissions, and optimize the key operating parameters of RCCI operation using hydrous ethanol as the primary fuel. It has been shown that hydrous ethanol with water content of up to 25% by volume can be effectively used in RCCI operation with ethanol energy fraction up to 75% over a wide engine load range. However, intake charge heating is needed at low loads and exhaust gas recirculation (EGR) is required under high load conditions. Response surface methodology (RSM) has been shown to be an efficient approach of identifying and optimizing the key engine operating parameters of RCCI operation with reduced experimentation. The performance and emissions characteristics of RCCI combustion have been shown to be different and subject to the influence of different engine operating parameters under different engine operating conditions. NOX and soot emissions have been considerably reduced with the optimal settings of operating parameters generated from the RSM models. The fumigated low reactivity fuel has been shown to primarily contribute to the relatively high hydrocarbon emissions from the RCCI combustion. The particulate matter (PM) emissions from RCCI combustion have been shown to be primarily composed of semi-volatile organic compounds and a smaller fraction of solid carbonaceous particles. The characteristics of RCCI PM emissions vary when using different low reactivity fuels and they are highly sensitive to dilution conditions such as dilution ratio and sampling system temperature.

Subjects/Keywords: hydrous ethanol; internal combustion engine; reactivity-controlled compression ignition; response surface methodology

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APA (6^th Edition):

Fang, W. (2016). An Experimental Investigation Of Reactivity-Controlled Compression Ignition Combustion In Diesel Engines Using Hydrous Ethanol. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/182265

Chicago Manual of Style (16^th Edition):

Fang, Wei. “An Experimental Investigation Of Reactivity-Controlled Compression Ignition Combustion In Diesel Engines Using Hydrous Ethanol.” 2016. Doctoral Dissertation, University of Minnesota. Accessed January 22, 2021. http://hdl.handle.net/11299/182265.

MLA Handbook (7^th Edition):

Fang, Wei. “An Experimental Investigation Of Reactivity-Controlled Compression Ignition Combustion In Diesel Engines Using Hydrous Ethanol.” 2016. Web. 22 Jan 2021.

Vancouver:

Fang W. An Experimental Investigation Of Reactivity-Controlled Compression Ignition Combustion In Diesel Engines Using Hydrous Ethanol. [Internet] [Doctoral dissertation]. University of Minnesota; 2016. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11299/182265.

Council of Science Editors:

Fang W. An Experimental Investigation Of Reactivity-Controlled Compression Ignition Combustion In Diesel Engines Using Hydrous Ethanol. [Doctoral Dissertation]. University of Minnesota; 2016. Available from: http://hdl.handle.net/11299/182265

14. Leguille, Matthieu. Étude du cliquetis dans un moteur industriel à allumage commandé par Simulation aux Grandes Échelles : Investigating knock in an industrial spark-ignition engine by Large-Eddy Simulation.

Degree: Docteur es, Combustion, 2018, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2018SACLC081

►

Les préoccupations environnementales actuelles ont conduit les constructeurs automobiles à proposer de nouvelles technologies dans le but de réduire les émissions de CO2. Parmi ces… (more)

▼

Les préoccupations environnementales actuelles ont conduit les constructeurs automobiles à proposer de nouvelles technologies dans le but de réduire les émissions de CO2. Parmi ces technologies, le downsizing appliqué aux moteurs turbocompressés à allumage commandé est une des solutions privilégiées, car permettant d'atteindre des points de fonctionnement fortement chargés, avec un meilleur rendement thermique. Cependant, les fortes charges favorisent l'apparition de cliquetis, un phénomène potentiellement dommageable pour le moteur et qui l'empêche d'exploiter tout son potentiel. Du fait des variabilités cycliques de combustion dans le moteur, le cliquetis, qui dépend des conditions locales dans la chambre de combustion, peut apparaître uniquement sur quelques cycles, à différents endroits et instants. Dans cette thèse, une approche par Simulation aux Grandes Échelles (SGE) a été choisi, dans le but d'étudier et d'améliorer notre compréhension du cliquetis. L'étude se base sur la SGE d'un moteur industriel, le RENAULT 1.2 TCe 115. Un premier ensemble de 30 cycles a été simulé sur un point de fonctionnement de référence, correspondant à un point cliquetant dans la base de données banc d'essais fournie par RENAULT. Les résultats de simulation ont été comparés aux résultats expérimentaux, aussi bien en termes de variabilités cycliques de combustion que de cliquetis. A la suite, un balayage d'avance à l'allumage a été simulé pour étendre la base de données LES à des points plus faiblement et plus fortement cliquetants. La base de données résultante se compose de 150 cycles de combustion, utilisés pour développer des méthodologies et outils, dans le but de mieux caractériser le cliquetis et d'approfondir sa compréhension. L'accès numérique à toute grandeur dans la chambre de combustion, combiné à la description séparée dans cette simulation entre la flamme de pré-mélange initiée par la bougie et l'auto-inflammation dans les gaz frais, ont permis de caractériser le cliquetis en se focalisant sur son origine : l'auto-inflammation. A la suite, les méthodologies et outils développés ont soutenu une analyse détaillée des mécanismes qui contrôlent l'apparition du cliquetis. En particulier, le lien entre le cliquetis et les variabilités cycliques de combustion a été exploré. Les résultats mettent notamment en évidence l'impact des variabilités cycliques, aussi bien de la vitesse de propagation que de la forme de la flamme de pré-mélange, sur le cliquetis.

The rising concerns about the environment have led car manufacturers to come up with new engine technologies, in order to reduce the impact of internal combustion engines on CO2 emissions. In this context, downsizing of turbocharged spark-ignition engines has become a commonly used technology, the advantage of which is to operate the engine under thermally more efficient high loads. However, these high loads favour the appearance of potentially damaging knock phenomena, which prevent the engine to fully exploit its potential. Because of cyclic combustion variability (CCV)…

Advisors/Committee Members: Angelberger, Christian (thesis director), Colin, Olivier (thesis director).

Subjects/Keywords: Cliquetis; Auto-inflammation; Variabilités cycliques de combustion; Simulation aux grandes échelles; Knock; Auto-ignition; Cyclic combustion variability; Large-eddy simulation

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APA (6^th Edition):

Leguille, M. (2018). Étude du cliquetis dans un moteur industriel à allumage commandé par Simulation aux Grandes Échelles : Investigating knock in an industrial spark-ignition engine by Large-Eddy Simulation. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2018SACLC081

Chicago Manual of Style (16^th Edition):

Leguille, Matthieu. “Étude du cliquetis dans un moteur industriel à allumage commandé par Simulation aux Grandes Échelles : Investigating knock in an industrial spark-ignition engine by Large-Eddy Simulation.” 2018. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed January 22, 2021. http://www.theses.fr/2018SACLC081.

MLA Handbook (7^th Edition):

Leguille, Matthieu. “Étude du cliquetis dans un moteur industriel à allumage commandé par Simulation aux Grandes Échelles : Investigating knock in an industrial spark-ignition engine by Large-Eddy Simulation.” 2018. Web. 22 Jan 2021.

Vancouver:

Leguille M. Étude du cliquetis dans un moteur industriel à allumage commandé par Simulation aux Grandes Échelles : Investigating knock in an industrial spark-ignition engine by Large-Eddy Simulation. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2018. [cited 2021 Jan 22]. Available from: http://www.theses.fr/2018SACLC081.

Council of Science Editors:

Leguille M. Étude du cliquetis dans un moteur industriel à allumage commandé par Simulation aux Grandes Échelles : Investigating knock in an industrial spark-ignition engine by Large-Eddy Simulation. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2018. Available from: http://www.theses.fr/2018SACLC081

15. Zaccardi, Jean-Marc. Contribution à la compréhension des combustions anormales dans les moteurs à allumage commandé : caractérisation et analyse phénoménologique du pré allumage à forte charge : Contribution the understanding of abnormal combustions in spark ignition engines : characterization and phenomenological analysis of pre-ignition at high load.

Degree: Docteur es, Thermique, énergétique, 2012, INSA Lyon

URL: http://www.theses.fr/2012ISAL0019

►

L'augmentation continue des charges de fonctionnement des moteurs à allumage commandé a conduit à l'apparition d'une nouvelle forme de combustion anormale à bas régime sous… (more)

▼

L'augmentation continue des charges de fonctionnement des moteurs à allumage commandé a conduit à l'apparition d'une nouvelle forme de combustion anormale à bas régime sous la forme d'un pré allumage. Dans des conditions de pression et de température extrêmes, une auto-inflammation incontrôlée du mélange carburé peut en effet se produire avant l'allumage normal à la bougie et conduire à une seconde auto-inflammation de type cliquetis donnant naissance à des oscillations de pression inacceptables même pour les moteurs les plus robustes. Cette anomalie constitue donc une véritable limite au downsizing des moteurs et à l'augmentation de leurs performances spécifiques. Cette dernière forme de combustion anormale est bien plus critique que le cliquetis car son apparition est aléatoire, le plus souvent sporadique et généralement très violente. Ces caractéristiques fondamentales expliquent que de nouveaux outils et de nouvelles méthodologies d'analyse aient dû être développés pour mieux caractériser le processus d'auto-inflammation dans ces conditions extrêmes. Des méthodes statistiques avancées ont notamment été mises au point pour quantifier de manière fiable la fréquence d'apparition du pré allumage malgré son caractère aléatoire. En parallèle, un travail expérimental important a été réalisé pour mettre au point une méthodologie de réalisation de visualisations endoscopiques permettant de mieux analyser le processus de combustion, et d'identifier de manière plus précise les zones préférentielles d'apparition du pré allumage dans la chambre de combustion. Les impacts des paramètres fondamentaux régissant l'auto-inflammation (aérodynamique interne, thermique et chimie du mélange) ont d'abord été analysés sur un monocylindre de recherche. Le processus de combustion a ainsi été détaillé et l'hypothèse d'une auto-inflammation spontanée en phase gazeuse a également pu être abordée en parallèle de l'analyse expérimentale par une approche numérique RANS. Une étude plus approfondie a ensuite montré qu'il était possible qu'un pré allumage conduise à une auto-inflammation de type détonation, ce qui explique qu'un nombre réduit d'occurrences suffise à détériorer irrémédiablement le moteur. La versatilité du monocylindre a également permis de mettre en évidence la diversité des phénomènes qui pouvaient conduire au pré allumage et d'autres hypothèses que celle d'une auto-inflammation spontanée en phase gazeuse ont ainsi pu être formulées. Celles-ci ont finalement été testées sur un multicylindre en appliquant des méthodologies d'essais et d'analyse éprouvées sur monocylindre. Les investigations tournées vers l'impact des réglages moteur ont alors notamment confirmé que les impacts du carburant sur les parois de la chambre de combustion conduisaient à la formation de films liquides dont les caractéristiques locales pouvaient être favorables à une auto-inflammation.

The continuous increase of engine loads on SI engines has provoked the apparition of a new form of abnormal combustion at low engine speed in the guise of a pre-ignition.…

Advisors/Committee Members: Escudié, Dany (thesis director).

Subjects/Keywords: Mécanique appliquée; Moteur à combustion interne; Moteur à allumage commandé; Combustion anormale; Pré-allumage; Couple moteur; Auto-inflammation; Forte charge; Modélisation de comportement; Pre-ignition; Spark ignition engine; Abnormal combustion; Auto-ignition; 629.207 2

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

APA (6^th Edition):

Zaccardi, J. (2012). Contribution à la compréhension des combustions anormales dans les moteurs à allumage commandé : caractérisation et analyse phénoménologique du pré allumage à forte charge : Contribution the understanding of abnormal combustions in spark ignition engines : characterization and phenomenological analysis of pre-ignition at high load. (Doctoral Dissertation). INSA Lyon. Retrieved from http://www.theses.fr/2012ISAL0019

Chicago Manual of Style (16^th Edition):

Zaccardi, Jean-Marc. “Contribution à la compréhension des combustions anormales dans les moteurs à allumage commandé : caractérisation et analyse phénoménologique du pré allumage à forte charge : Contribution the understanding of abnormal combustions in spark ignition engines : characterization and phenomenological analysis of pre-ignition at high load.” 2012. Doctoral Dissertation, INSA Lyon. Accessed January 22, 2021. http://www.theses.fr/2012ISAL0019.

MLA Handbook (7^th Edition):

Zaccardi, Jean-Marc. “Contribution à la compréhension des combustions anormales dans les moteurs à allumage commandé : caractérisation et analyse phénoménologique du pré allumage à forte charge : Contribution the understanding of abnormal combustions in spark ignition engines : characterization and phenomenological analysis of pre-ignition at high load.” 2012. Web. 22 Jan 2021.

Vancouver:

Zaccardi J. Contribution à la compréhension des combustions anormales dans les moteurs à allumage commandé : caractérisation et analyse phénoménologique du pré allumage à forte charge : Contribution the understanding of abnormal combustions in spark ignition engines : characterization and phenomenological analysis of pre-ignition at high load. [Internet] [Doctoral dissertation]. INSA Lyon; 2012. [cited 2021 Jan 22]. Available from: http://www.theses.fr/2012ISAL0019.

Council of Science Editors:

Zaccardi J. Contribution à la compréhension des combustions anormales dans les moteurs à allumage commandé : caractérisation et analyse phénoménologique du pré allumage à forte charge : Contribution the understanding of abnormal combustions in spark ignition engines : characterization and phenomenological analysis of pre-ignition at high load. [Doctoral Dissertation]. INSA Lyon; 2012. Available from: http://www.theses.fr/2012ISAL0019

Northeastern University

16. Nicolas, Ghassan Jawdat. The rate-controlled constrained-equilibrium modeling of C1-C2/O2/diluent mixtures.

Degree: PhD, Department of Mechanical and Industrial Engineering, 2012, Northeastern University

URL: http://hdl.handle.net/2047/d20002907

► The method of Rate-Controlled Constrained-Equilibrium (RCCE) has been further developed to study the combustion of CH4/Air and C2H5OH/O2/Diluent mixtures. The method is based on local… (more)

▼ The method of Rate-Controlled Constrained-Equilibrium (RCCE) has been further developed to study the combustion of CH4/Air and C2H5OH/O2/Diluent mixtures. The method is based on local maximization of entropy or minimization of a relevant free energy at any time during the non-equilibrium evolution of the system subject to a set of kinetic constraints. These constraints are imposed by slow rate-limiting reactions. Direct integration of the rate equations for the constraint potentials were used, once the values of which are known, the concentration of all species can be calculated.; It is well established that oxidation of C1-C2 molecules constitutes a major part of high temperature oxidation of heavy hydrocarbons, either under flame or homogeneous conditions. Since the RCCE model of C1/O2 combustion has been studied by Janbozorgi et. al [1], this thesis extends the work to C1/air mixtures. It is intended to identify a minimal set of constraints that independently from the initial thermodynamic state result in acceptable agreements with the detailed kinetic model. The model includes 60 species and 351 reactions. A set of 16 constraints was found to yield great agreement with the detailed model over a wide range of initial conditions. At high temperatures the ignition delay time, is significantly lower than the hydrodynamic and thermal boundary layer time scales in shock tubes. As a result, a constant energy model is satisfactory. At low temperatures, however, the ignition delay time is long enough for these competing effects to come into play. In order to properly take these effects into account, modifications to the reactor type, by introducing the prescribed pressure (H, P) profile, will be made for comparison against experimental data.; RCCE is then applied to C2 oxidation mainly C2H5OH/O2/Diluent mixtures. The Li, Kazakov, Chaos and Dryer's [2] C2H5OH/O2/Diluent detailed kinetic model (DKM) has been used for this study. The model originally includes 37 species and 232 reactions. Hydrogen abstraction via O2 was found to be an important under certain initial conditions, so 3 corresponding reactions were added to the model to form a set of 235 chemical reactions. A set of 16 constraints was found to yield great agreement with the detailed model over a wide range of initial conditions. Moreover, a reduced set of 13 constraints was identified, that predicted well the ignition delay time from shock tube experiments. In the C2 model, nitrogen and argon are used as diluents when comparing RCCE to DKM and experimental data respectively.

Subjects/Keywords: detailed modeling; ethanol; ignition delay time; maximum entropy principle; methane; rate-controlled constrained-equilibrium; Energy Systems; Mechanical Engineering

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

APA (6^th Edition):

Nicolas, G. J. (2012). The rate-controlled constrained-equilibrium modeling of C1-C2/O2/diluent mixtures. (Doctoral Dissertation). Northeastern University. Retrieved from http://hdl.handle.net/2047/d20002907

Chicago Manual of Style (16^th Edition):

Nicolas, Ghassan Jawdat. “The rate-controlled constrained-equilibrium modeling of C1-C2/O2/diluent mixtures.” 2012. Doctoral Dissertation, Northeastern University. Accessed January 22, 2021. http://hdl.handle.net/2047/d20002907.

MLA Handbook (7^th Edition):

Nicolas, Ghassan Jawdat. “The rate-controlled constrained-equilibrium modeling of C1-C2/O2/diluent mixtures.” 2012. Web. 22 Jan 2021.

Vancouver:

Nicolas GJ. The rate-controlled constrained-equilibrium modeling of C1-C2/O2/diluent mixtures. [Internet] [Doctoral dissertation]. Northeastern University; 2012. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2047/d20002907.

Council of Science Editors:

Nicolas GJ. The rate-controlled constrained-equilibrium modeling of C1-C2/O2/diluent mixtures. [Doctoral Dissertation]. Northeastern University; 2012. Available from: http://hdl.handle.net/2047/d20002907

17. Roulo, David J. Effect of Low Reactivity Fuel on Reaction Wave Growth of Dual-Fuel Stratified Mixtures in a Rapid Compression Machine.

Degree: 2019, Marquette University

URL: https://epublications.marquette.edu/theses_open/540

► For over 40 years, researchers have been studying homogenous charge compression ignition (HCCI) as a combustion strategy to improve the efficiency and emissions of the… (more)

▼ For over 40 years, researchers have been studying homogenous charge compression ignition (HCCI) as a combustion strategy to improve the efficiency and emissions of the internal combustion strategy. Although early results were promising, it has been since discovered that HCCI engines only operate to their potential over a narrow load band. To remedy this, introducing inhomogeneities has been suggested as a method of controlling HCCI combustion in such a way to improve its usefulness. One such inhomogeneity is referred to as fuel octane number stratification and consists of port injecting a low reactivity fuel, allowing it to become well mixed, and then direct injecting a high reactivity fuel to introduce local mixture stratifications. Reciprocating engine and computational studies have shown this to improve efficiency and emissions of compression ignition engines, however, there has been little work done to explore octane number stratification on a per stroke basis in well-controlled conditions. The objective of this study is to utilize fuel octane number stratification combustion strategy to optically observe the influence of the low-reactivity fuel, propane, on the dynamics of the reaction zone growth. To accomplish this, a rapid compression machine (RCM) was used to perform experiments in which combustion was captured by a high-speed camera. The RCM was outfitted with heaters and a polycarbonate window to control the temperature and optically access the cylinder. In addition, the mixture composition of propane to n-heptane was varied while keeping the global equivalence ratio constant at three unique initial temperatures. The results of this study showed that ignition time, reaction front start location, and reaction front speed was sensitive to the amount of propane in the mixture. As propane content was decreased the time for the mixture to ignite relative to the start of compression decreased. Furthermore, as propane content decreased, the origin of the reaction front(s) increased in height along the cylinder wall. Reaction front velocity also increased as propane content decreased. Finally, through this work it was also discovered that ignition time and the reaction front speed of some mixtures were sensitive to changes in initial and compressed temperature. Advisors/Committee Members: Allen, Casey M., Singer, Simcha, Roy, Somesh.

Subjects/Keywords: Combustion Imaging; Dual-Fuel Stratification; Rapid Compression Machine; Reaction Front Speed; Reaction Zone Growth; Reactivity Controlled Compression Ignition; Engineering

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APA (6^th Edition):

Roulo, D. J. (2019). Effect of Low Reactivity Fuel on Reaction Wave Growth of Dual-Fuel Stratified Mixtures in a Rapid Compression Machine. (Thesis). Marquette University. Retrieved from https://epublications.marquette.edu/theses_open/540

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):

Roulo, David J. “Effect of Low Reactivity Fuel on Reaction Wave Growth of Dual-Fuel Stratified Mixtures in a Rapid Compression Machine.” 2019. Thesis, Marquette University. Accessed January 22, 2021. https://epublications.marquette.edu/theses_open/540.

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

MLA Handbook (7^th Edition):

Roulo, David J. “Effect of Low Reactivity Fuel on Reaction Wave Growth of Dual-Fuel Stratified Mixtures in a Rapid Compression Machine.” 2019. Web. 22 Jan 2021.

Vancouver:

Roulo DJ. Effect of Low Reactivity Fuel on Reaction Wave Growth of Dual-Fuel Stratified Mixtures in a Rapid Compression Machine. [Internet] [Thesis]. Marquette University; 2019. [cited 2021 Jan 22]. Available from: https://epublications.marquette.edu/theses_open/540.

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

Council of Science Editors:

Roulo DJ. Effect of Low Reactivity Fuel on Reaction Wave Growth of Dual-Fuel Stratified Mixtures in a Rapid Compression Machine. [Thesis]. Marquette University; 2019. Available from: https://epublications.marquette.edu/theses_open/540

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

Universidade do Rio Grande do Sul

18. Schultz, Eduardo dos Santos. A importância do ponto de operação nas técnicas de self-optimizing control.

Degree: 2015, Universidade do Rio Grande do Sul

URL: http://hdl.handle.net/10183/127932

►

A otimização de processos vem se tornando uma ferramenta fundamental para o aumento da lucratividade das plantas químicas. Diversos métodos de otimização foram propostos ao… (more)

▼

A otimização de processos vem se tornando uma ferramenta fundamental para o aumento da lucratividade das plantas químicas. Diversos métodos de otimização foram propostos ao longo dos anos, sendo que a otimização em tempo real (RTO) é a solução mais consolidada industrialmente, enquanto que o self-optimizing control (SOC) surge como uma alternativa simplificada, com um menor custo de implantação em relação a esse. Neste trabalho são estudados diversos aspectos da metodologia de SOC, iniciando pela análise do impacto do ponto de operação para o desenvolvimento de estruturas de controle auto-otimizáveis. São propostas modificações na formulação do problema de otimização de SOC de modo que as variáveis controladas sejam determinadas no mesmo problema de otimização em que é escolhido o ponto de operação, permitindo a redução da perda do processo. De forma a analisar a influência da dinâmica nos resultados obtidos, é realizado um estudo comparativo da perda gerada no processo ao longo da operação para as estruturas de otimização baseadas em RTO e em SOC. Com base nos resultados obtidos para uma unidade didática, mostra-se que o comportamento dinâmico do distúrbio possui grande influência na escolha da técnica de otimização, quebrando a ideia de que o RTO é um limite superior do SOC. A aplicação industrial das técnicas clássicas de SOC é validada em uma unidade de separação de propeno, baseada em uma unidade real em operação. A partir da modelagem do processo em simulador comercial, foram geradas as variáveis controladas que permitam uma perda aceitável para a unidade, comprovando a viabilidade de implantação da metodologia em unidades reais.

Process optimization has become a fundamental tool for increasing chemical plants profit. Several optimization methods have been proposed over the years, and real-time optimization (RTO) is the most consolidated solution industrially while self-optimizing control (SOC) appears as a simplified alternative with a lower implementation cost. In this work several aspects of SOC methodology are studied, starting from the analysis of the impact of operating point in the development of self-optimizing control structures. Improvements are proposed in SOC optimization problem formulation where controlled variables are determined in the same optimization problem that operating point, thus reducing significantly process loss. In order to analyze the influence of dynamics on the results, a comparative study is accomplished comparing the loss generated in the process throughout the operation for optimization structures based on RTO and SOC. With the results generated for a toy unit, it is shown that the disturbance dynamic behavior has a great influence on choosing the optimization technique, breaking the idea that RTO is an upper limit of SOC. The industrial application of classical SOC techniques is tested on a propylene separation unit, really operating nowadays. The process was modelled in a commercial simulator and with this model it was generated the best set of controlled variables, based…

Advisors/Committee Members: Farenzena, Marcelo.

Subjects/Keywords: Process optimization; Auto-otimização; Self-optimizing control; Real-time optimization; Controlled variable selection

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APA (6^th Edition):

Schultz, E. d. S. (2015). A importância do ponto de operação nas técnicas de self-optimizing control. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/127932

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):

Schultz, Eduardo dos Santos. “A importância do ponto de operação nas técnicas de self-optimizing control.” 2015. Thesis, Universidade do Rio Grande do Sul. Accessed January 22, 2021. http://hdl.handle.net/10183/127932.

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

MLA Handbook (7^th Edition):

Schultz, Eduardo dos Santos. “A importância do ponto de operação nas técnicas de self-optimizing control.” 2015. Web. 22 Jan 2021.

Vancouver:

Schultz EdS. A importância do ponto de operação nas técnicas de self-optimizing control. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2015. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10183/127932.

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

Council of Science Editors:

Schultz EdS. A importância do ponto de operação nas técnicas de self-optimizing control. [Thesis]. Universidade do Rio Grande do Sul; 2015. Available from: http://hdl.handle.net/10183/127932

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

University of Michigan

19. Pal, Pinaki. Computational Modeling and Analysis of Low Temperature Combustion Regimes for Advanced Engine Applications.

Degree: PhD, Mechanical Engineering, 2016, University of Michigan

URL: http://hdl.handle.net/2027.42/120735

► To achieve cleaner and more efficient energy utilization, novel strategies in modern combustion devices operate using lean, premixed reactant mixtures at high pressures. Under these… (more)

▼ To achieve cleaner and more efficient energy utilization, novel strategies in modern combustion devices operate using lean, premixed reactant mixtures at high pressures. Under these conditions, auto-ignition often becomes a dominant process for burning. Therefore, accurate prediction of auto-ignition characteristics is of paramount importance in successful implementation of these advanced combustion systems. The first part of this dissertation focuses on auto-ignition characteristics at high-pressure, low-temperature conditions, relevant to modern gas turbine engines. In particular, strong (homogeneous) and weak (deflagration-dominant) ignition regimes in the presence of thermal inhomogeneities are computationally investigated. Predictive criteria based on Zel’dovich’s theory and passive scalar mixing, which can capture the ignition behavior a priori, are proposed and validated using extensive parametric tests of one-dimensional laminar systems of a lean syngas/air mixture. Subsequently, a non-dimensional scaling analysis is performed to derive regime criteria for turbulent reacting flows, leading to a turbulent ignition regime diagram. The regime diagram is then numerically validated against two-dimensional direct numerical simulations of syngas/air auto-ignition. A number of parametric test cases, by varying the turbulent Damköhler and Reynolds numbers, are considered. The auto-ignition phenomena are characterized by analyzing the corresponding heat release rates and resultant combustion modes. It is demonstrated that the observed ignition behaviors are consistent with the regime diagram predictions. In the second part of the dissertation, applicability of a Reynolds-Averaged Navier Stokes based spray-interactive flamelet (SIF) combustion model to stratified LTC in direct-injection compression ignition (DICI) engines is assessed, which incorporates the interaction between spray evaporation, gas-phase combustion and turbulent mixing. A number of parametric cases are considered by way of varying the fuel start-of-injection (SOI) timing. The numerical results are validated against available experimental data for in-cylinder pressure trace and CO/NO emissions. It is shown that the SIF model performs well over a wide range of stratified conditions due to the incorporation of the effects of small-scale turbulent transport on combustion. Finally, the SIF model is employed to further investigate the impact of fuel injection parameters such as injection pressure and spray cone angle on the NO-CO trade-off of the DICI engine for the most delayed SOI timing. Advisors/Committee Members: Im, Hong G (committee member), Wooldridge, Margaret S (committee member), Raman, Venkatramanan (committee member), Katopodes, Nikolaos D (committee member), Atreya, Arvind (committee member).

Subjects/Keywords: Combustion; Computational fluid dynamics; Modeling and simulation; Turbulence-chemistry interaction; Auto-ignition; High-efficiency engines; Mechanical Engineering; Engineering

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

APA (6^th Edition):

Pal, P. (2016). Computational Modeling and Analysis of Low Temperature Combustion Regimes for Advanced Engine Applications. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/120735

Chicago Manual of Style (16^th Edition):

Pal, Pinaki. “Computational Modeling and Analysis of Low Temperature Combustion Regimes for Advanced Engine Applications.” 2016. Doctoral Dissertation, University of Michigan. Accessed January 22, 2021. http://hdl.handle.net/2027.42/120735.

MLA Handbook (7^th Edition):

Pal, Pinaki. “Computational Modeling and Analysis of Low Temperature Combustion Regimes for Advanced Engine Applications.” 2016. Web. 22 Jan 2021.

Vancouver:

Pal P. Computational Modeling and Analysis of Low Temperature Combustion Regimes for Advanced Engine Applications. [Internet] [Doctoral dissertation]. University of Michigan; 2016. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2027.42/120735.

Council of Science Editors:

Pal P. Computational Modeling and Analysis of Low Temperature Combustion Regimes for Advanced Engine Applications. [Doctoral Dissertation]. University of Michigan; 2016. Available from: http://hdl.handle.net/2027.42/120735

Brno University of Technology

20. Melichárek, Patrik. Detekce a analýza detonačního spalování: Knock detection and analysis.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/176708

► This thesis focuses on knocking combustion. First part of this thesis focuses on recherche of this topic, where is a brief comparison of normal and… (more)

Subjects/Keywords: Detonační spalování; samovznícení; klepání; oktanové číslo; detekce klepání; Knocking combustion; auto-ignition; knocking; octane number; knocking detection

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APA (6^th Edition):

Melichárek, P. (2019). Detekce a analýza detonačního spalování: Knock detection and analysis. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/176708

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):

Melichárek, Patrik. “Detekce a analýza detonačního spalování: Knock detection and analysis.” 2019. Thesis, Brno University of Technology. Accessed January 22, 2021. http://hdl.handle.net/11012/176708.

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

MLA Handbook (7^th Edition):

Melichárek, Patrik. “Detekce a analýza detonačního spalování: Knock detection and analysis.” 2019. Web. 22 Jan 2021.

Vancouver:

Melichárek P. Detekce a analýza detonačního spalování: Knock detection and analysis. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11012/176708.

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

Council of Science Editors:

Melichárek P. Detekce a analýza detonačního spalování: Knock detection and analysis. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/176708

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

21. Vicquelin, Ronan. Tabulation de la cinétique chimique pour la modélisation et la simulation de la combustion turbulente : Tabulated chemistry for turbulent combustion modeling and simulation.

Degree: Docteur es, combustion, 2010, Châtenay-Malabry, Ecole centrale de Paris

URL: http://www.theses.fr/2010ECAP0015

► Cette thèse se situe dans le cadre de la simulation numérique de la combustion turbulente à l’aide de méthodes de tabulation de la cinétique chimique.… (more)

▼ Cette thèse se situe dans le cadre de la simulation numérique de la combustion turbulente à l’aide de méthodes de tabulation de la cinétique chimique. En approximant la structure fine des flammes turbulentes, ces méthodes prennent en compte des effets fins de cinétique chimique pour un faible coup dans les calculs numériques. Ceci permet de prédire les champs de température et d’espèces chimiques incluant les polluants. Le champ d’application de la chimie tabulée a d’abord été réservé à la simulation des écoulements moyens (RANS) dans une hypothèse de faible nombre de Mach pour une combustion dite "conventionnelle". Cependant, le développement actuel de nouvelles technologies de combustion ainsi que celui de modèles numériques plus avancés que les approches RANS nécessite d’étendre ce champ d’application. Les travaux de cette thèse ont mené au développement de nouveaux modèles de chimie tabulée afin de répondre à ces nouvelles exigences. L’émergence de nouvelles technologies comme la combustion sans flamme nécessite le développement de modèles dédiés. Ce mode de combustion présente en effet des structures de flamme mixtes. C’est pourquoi un modèle de tabulation de la cinétique chimique nommé UTaC (Unsteady flamelets Tabulated Chemistry) est proposé pour prédire la combustion diluée à haute température qui caractérise la combustion sans flamme. Le modèle est basé sur la tabulation de solutions instationnaires de flammelettes non-prémelangées qui s’auto-allument. Les pertes thermiques et la dilution variable des gaz brûlés sont négligés dans le cadre de cette thèse par soucis de simplification et de clarté de la validation du modèle. Le modèle est appliqué au cas d’un jet de combustible dilué dans un environnement de gaz vicié qui favorise l’auto-allumage comme moyen de stabilisation d’une flamme liftée. Plusieurs simulations RANS sont réalisées en faisant varier le combustible utilisé. Enfin, une simulation aux grandes échelles (LES) est aussi conduite pour le mélange méthane/air. Plusieurs codes numériques dédiés à la LES sont basés sur une formulation compressible des équations de Navier-Stokes. Cependant les méthodes de tabulation ne permettent pas directement de prendre en compte les effets acoustiques. Un modèle appelé TTC (Tabulated Thermo-chemistry for Compressible flows) a été créé afin d’introduire les méthodes de chimie tabulée dans les codes numériques compressibles. Pour cela, le calcul de la température est reformulé ainsi que le traitement des conditions aux limites à l’aide d’ondes caractéristiques. Enfin, l’application de modèle RANS de tabulation de la cinétique chimique à la LES est souvent faite sans tenir compte des spécificités de la simulation aux grandes échelles. Ainsi, les fonctions de densité de probabilités de type ß qui traduisent l’interaction de la combustion avec la turbulence en RANS sont utilisées telles quelles en LES. Nous montrerons que cette hypothèse est mauvaise car elle ne conserve pas l’intégrale du terme source dans une flamme prémélangée. Un nouveau modèle de chimie tabulée… Advisors/Committee Members: Gicquel, Olivier (thesis director), Fiorina, Benoît (thesis director).

Subjects/Keywords: Combustion turbulente; auto-allumage; combustion sans flamme; chimie tabulée; simulation des écoulements moyens; simulation aux grandes échelles; Turbulent combustion; auto-ignition; large-eddy simulation

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

APA (6^th Edition):

Vicquelin, R. (2010). Tabulation de la cinétique chimique pour la modélisation et la simulation de la combustion turbulente : Tabulated chemistry for turbulent combustion modeling and simulation. (Doctoral Dissertation). Châtenay-Malabry, Ecole centrale de Paris. Retrieved from http://www.theses.fr/2010ECAP0015

Chicago Manual of Style (16^th Edition):

Vicquelin, Ronan. “Tabulation de la cinétique chimique pour la modélisation et la simulation de la combustion turbulente : Tabulated chemistry for turbulent combustion modeling and simulation.” 2010. Doctoral Dissertation, Châtenay-Malabry, Ecole centrale de Paris. Accessed January 22, 2021. http://www.theses.fr/2010ECAP0015.

MLA Handbook (7^th Edition):

Vicquelin, Ronan. “Tabulation de la cinétique chimique pour la modélisation et la simulation de la combustion turbulente : Tabulated chemistry for turbulent combustion modeling and simulation.” 2010. Web. 22 Jan 2021.

Vancouver:

Vicquelin R. Tabulation de la cinétique chimique pour la modélisation et la simulation de la combustion turbulente : Tabulated chemistry for turbulent combustion modeling and simulation. [Internet] [Doctoral dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2010. [cited 2021 Jan 22]. Available from: http://www.theses.fr/2010ECAP0015.

Council of Science Editors:

Vicquelin R. Tabulation de la cinétique chimique pour la modélisation et la simulation de la combustion turbulente : Tabulated chemistry for turbulent combustion modeling and simulation. [Doctoral Dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2010. Available from: http://www.theses.fr/2010ECAP0015

University of Newcastle

22. Al-Zuraiji, Mohammed Jabbar Ajrash. Ignition and explosion characteristics of coal dust and methane mixture under conditions pertinent to ventilation air methane abatement.

Degree: PhD, 2020, University of Newcastle

URL: http://hdl.handle.net/1959.13/1412553

►

Research Doctorate - Doctor of Philosophy (PhD)

Fire and explosion caused by combustible dusts and flammable gases is a major safety concern in the extractive… (more)

▼

Research Doctorate - Doctor of Philosophy (PhD)

Fire and explosion caused by combustible dusts and flammable gases is a major safety concern in the extractive industries, such as petroleum and coal mining. Combustible coal dust and methane gas can be exploded in the presence of an ignition source with sufficient ignition energy. These accidents can claim many lives and cause considerable property damage. The indirect costs of these types of accidents, however, are substantially higher and cannot be expressed in dollars. To avoid fires and explosions from occurring in coal mines as well as to reduce the consequences of accidental explosions, an indepth understanding of this phenomena is critical. To understand the most important fire and explosion driving components, as well as to develop the most suitable counter measures, a comprehensive experimental work was carried out at the University of Newcastle, Australia. The aim of this research was to determine the ignition and explosion characteristics of coal dust clouds and methane mixtures in Ventilation Air Methane (VAM) Capture Ducts. The objectives of this work include investigating the impact of environmental conditions and ignition source energy on the thermal, fire and explosion properties of coal dust and methane gas, which are often in the VAM stream. The first study focused on the Minimum Auto Ignition Temperature (MAIT) for coal dust particles deposited in layer form inside the VAM safety capture duct. This study was conducted by employing a flat top furnace (made by the ANKO company) in accordance with the ASTM E2021 and IEC 1241 standards. The MAIT for coal dust layer outcomes indicated that the humidity and the hot environment have slight influences on the MAIT. However, the coal dust particle sizes and packing have a significant impact on the MAIT. The multi-ignition phenomenon of the dust layer is attributed to the moisture content in the dust bed. The influences of environmental conditions and the particles’ compositions on the MAIT of dust clouds were investigated according to the potential coal dust particles that were likely to be present in a VAM capture duct stream. The goal was achieved by employing an ANKO MAIT dust cloud apparatus (ASTM E1491). It was revealed that 15 g.m⁻³ of coal dust cloud is able to auto ignite when it is in cloud form, and the flame of combustion travels and reaches the end of the furnace. The moisture content, which was up to 4.21 %, had no influence on the MAIT of the dust cloud. For particle sizes between 0-74μm it was found that for a coal dust concentration above 300 g.m⁻³ the volatile matter content has a profound impact. However, for coal dust concentrations below 100 g.m⁻³ the mean particle size (D₅₀) has a pronounced impact on the volatile matter due to the reaction on the surface which drives the ignition process. The third investigation focused on the methane’s lower flammability limit and the lower explosion limit of a hybrid methane-coal dust explosion. Two apparatus were employed for this aim. These were…

Advisors/Committee Members: University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering.

Subjects/Keywords: ventilation air methane; fire; pressure relieving; detonation tube; flame propagation; mine safey; fire countermeasure; explosion countermeasure; explosion; coal dust ignition; minimum ignition energy; auto ignition temperature; hybrid explosion; methane explosion; methane; flame deflagration

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APA (6^th Edition):

Al-Zuraiji, M. J. A. (2020). Ignition and explosion characteristics of coal dust and methane mixture under conditions pertinent to ventilation air methane abatement. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1412553

Chicago Manual of Style (16^th Edition):

Al-Zuraiji, Mohammed Jabbar Ajrash. “Ignition and explosion characteristics of coal dust and methane mixture under conditions pertinent to ventilation air methane abatement.” 2020. Doctoral Dissertation, University of Newcastle. Accessed January 22, 2021. http://hdl.handle.net/1959.13/1412553.

MLA Handbook (7^th Edition):

Al-Zuraiji, Mohammed Jabbar Ajrash. “Ignition and explosion characteristics of coal dust and methane mixture under conditions pertinent to ventilation air methane abatement.” 2020. Web. 22 Jan 2021.

Vancouver:

Al-Zuraiji MJA. Ignition and explosion characteristics of coal dust and methane mixture under conditions pertinent to ventilation air methane abatement. [Internet] [Doctoral dissertation]. University of Newcastle; 2020. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/1959.13/1412553.

Council of Science Editors:

Al-Zuraiji MJA. Ignition and explosion characteristics of coal dust and methane mixture under conditions pertinent to ventilation air methane abatement. [Doctoral Dissertation]. University of Newcastle; 2020. Available from: http://hdl.handle.net/1959.13/1412553

Freie Universität Berlin

23. Berndt, Phillip. Mathematische Modellierung der stoßfreien, druckerhöhenden Verbrennung (SEC).

Degree: 2016, Freie Universität Berlin

URL: http://dx.doi.org/10.17169/refubium-10410

► Die stoßfreie, druckerhöhende Verbrennung (shockless explosion combustion, SEC) ist ein alternativer Betriebsmodus für Gasturbinen. Sie stellt eine Annäherung an eine Gleichraumverbrennung mit Aussicht auf eine… (more)

▼ Die stoßfreie, druckerhöhende Verbrennung (shockless explosion combustion, SEC) ist ein alternativer Betriebsmodus für Gasturbinen. Sie stellt eine Annäherung an eine Gleichraumverbrennung mit Aussicht auf eine hohe Effizienzsteigerung dar. Besonders macht sie dabei der aktive Einsatz schwacher Detonationen: Der Prozess erzeugt eine Schichtung von Luft und Treibstoff, die nach einer Weile sequentiell selbstzündet. Im Gegensatz zu den starken Stoßwellen, die eine Detonation mit sich bringen würde, erzeugt die folgende Verbrennung glatte Druckwellen. In der SEC wird die durch diese Wellen erzeugte Akustik zum Spülen und Nachladen des Brennrohres verwendet. Diese Arbeit dokumentiert eine erste, theoretische Untersuchung des Prozesses. Dabei wird ein Modell sowie dazugehörige numerische Verfahren für seine Simulation vorgestellt. Die Arbeit besteht aus drei Teilen: Der erste Teil beschäftigt sich mit Treibstoffen für den SEC Prozess. Eine SEC erfordert spezielle Treibstoffe, die die Eigenschaft haben, eine im wesentlichen temperaturunabhängige Zündverzugszeit zu besitzen. Als Zündverzugszeit bezeichnet man dabei die Zeit, die zwischen der Erzeugung eines Treibstoff /Luft-Gemisches bei relativ hohen Temperaturen und seiner Selbstzündung vergeht. Treibstoffe mit dieser Eigenschaft besitzen eine komplexe Reaktionskinetik, die sich mit traditionellen Verfahren nur mit hochdimensionalen Modellen beschreiben lässt. Solche Modelle sind für qualitative Strömungssimulationen ungeeignet. In dieser Arbeit wird daher ein generisches, niedrigdimensionales Modell für derartige Treibstoffe eingeführt. Das Modell erreicht die Niedrigdimensionalität dabei, indem der Treibstoff auf das geforderte Verhalten im Fall einer funktionierenden SEC reduziert wird. Weiterhin werden Ergebnisse rund um die Modellreduktion und Optimierung eines für die SEC vorgeschlagenen Treibstoffes vorgestellt. Der zweite Teil der Arbeit entwickelt numerische Verfahren zur Simulation einer SEC. Zur Beschreibung des strömungsmechanischen Verhaltens des Systems werden dabei die reaktiven Eulergleichungen verwendet. Da das System verschiedensten Temperaturen ausgesetzt ist, wird die ideale Gasgleichung mit temperaturabhängigen Wärmekapazitäten verwendet. Um dieses Gleichungssystem mit einem Finite-Volumen-Verfahren lösen zu können, wird zunächst die Lösung des Riemannproblems für diesen Fall diskutiert. Daraufhin führt die Arbeit die nötigen Erweiterungen für den HLLEM-Löser ein, um mit allgemeinen idealen Gasgemischen umgehen zu können. Insbesondere wird die Positivität des sich ergebenden Verfahrens bewiesen. Zusätzlich diskutiert der Teil der Arbeit das bekannte Problem von Druckschwankungen an Kontaktunstetigkeiten und stellt eine Verbindung zu einem physikalischen Phänomen her. Der dritte Teil nutzt das entwickelte numerische Verfahren zusammen mit den Kinetikmodellen, um die SEC zu simulieren. Es wird zunächst gezeigt, dass eine SEC prinzipiell machbar ist. Durch weitere Simulationen gelangt der Teil dann zu Abschätzungen, die für die Suche nach einem… Advisors/Committee Members: m (gender), Prof. Dr.-Ing. Rupert Klein (firstReferee), Prof. Dr.-Ing. Christian Oliver Paschereit (furtherReferee), Prof. Dr. rer. nat. Volker John (furtherReferee).

Subjects/Keywords: Shockless Explosion Combustion; Auto-ignition; Auto-ignition delay time; Ideal gas Riemann solvers; 500 Naturwissenschaften und Mathematik::510 Mathematik::518 Numerische Analysis; 500 Naturwissenschaften und Mathematik::510 Mathematik::510 Mathematik; 600 Technik, Medizin, angewandte Wissenschaften::620 Ingenieurwissenschaften::620 Ingenieurwissenschaften und zugeordnete Tätigkeiten

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

APA (6^th Edition):

Berndt, P. (2016). Mathematische Modellierung der stoßfreien, druckerhöhenden Verbrennung (SEC). (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-10410

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):

Berndt, Phillip. “Mathematische Modellierung der stoßfreien, druckerhöhenden Verbrennung (SEC).” 2016. Thesis, Freie Universität Berlin. Accessed January 22, 2021. http://dx.doi.org/10.17169/refubium-10410.

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

MLA Handbook (7^th Edition):

Berndt, Phillip. “Mathematische Modellierung der stoßfreien, druckerhöhenden Verbrennung (SEC).” 2016. Web. 22 Jan 2021.

Vancouver:

Berndt P. Mathematische Modellierung der stoßfreien, druckerhöhenden Verbrennung (SEC). [Internet] [Thesis]. Freie Universität Berlin; 2016. [cited 2021 Jan 22]. Available from: http://dx.doi.org/10.17169/refubium-10410.

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

Council of Science Editors:

Berndt P. Mathematische Modellierung der stoßfreien, druckerhöhenden Verbrennung (SEC). [Thesis]. Freie Universität Berlin; 2016. Available from: http://dx.doi.org/10.17169/refubium-10410

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

The Ohio State University

24. Lubot, Eugene Stephen. Ts'ai Yuan-P'ei from Confucian scholar to chancellor of Peking University, 1868-1923 : the evolution of a patient reformer .

Degree: PhD, Graduate School, 1970, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486655760440075

Subjects/Keywords: History; Cai

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APA (6^th Edition):

Lubot, E. S. (1970). Ts'ai Yuan-P'ei from Confucian scholar to chancellor of Peking University, 1868-1923 : the evolution of a patient reformer . (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1486655760440075

Chicago Manual of Style (16^th Edition):

Lubot, Eugene Stephen. “Ts'ai Yuan-P'ei from Confucian scholar to chancellor of Peking University, 1868-1923 : the evolution of a patient reformer .” 1970. Doctoral Dissertation, The Ohio State University. Accessed January 22, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486655760440075.

MLA Handbook (7^th Edition):

Lubot, Eugene Stephen. “Ts'ai Yuan-P'ei from Confucian scholar to chancellor of Peking University, 1868-1923 : the evolution of a patient reformer .” 1970. Web. 22 Jan 2021.

Vancouver:

Lubot ES. Ts'ai Yuan-P'ei from Confucian scholar to chancellor of Peking University, 1868-1923 : the evolution of a patient reformer . [Internet] [Doctoral dissertation]. The Ohio State University; 1970. [cited 2021 Jan 22]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486655760440075.

Council of Science Editors:

Lubot ES. Ts'ai Yuan-P'ei from Confucian scholar to chancellor of Peking University, 1868-1923 : the evolution of a patient reformer . [Doctoral Dissertation]. The Ohio State University; 1970. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486655760440075

25. Tyagi, Prashant. Elaboration de membranes polymères auto-réparables : Elaboration of self-healing polymer membranes.

Degree: Docteur es, Chimie des matériaux, 2012, Montpellier, Ecole nationale supérieure de chimie; Ecole nationale supérieure de chimie (Montpellier)

URL: http://www.theses.fr/2012ENCM0015

►

L'objectif de cette thèse est d'élaborer et de développer un type de membranes polymères qui peuvent se réparer de manière autonome en cas de fissures.… (more)

▼

L'objectif de cette thèse est d'élaborer et de développer un type de membranes polymères qui peuvent se réparer de manière autonome en cas de fissures. Si elles ne sont pas détectées, ces fissures peuvent poser des problèmes notamment pour des applications médicales. Dans une première partie, une membrane polymère dynamique à base de micelles de copolymère tribloc ABA a été préparée. Le bloc "A" est représenté par le poly (styrene-co-acrylonitrile), copolymère bloc mécaniquement robuste, et un bloc "B" relativement mou et souple, le poly (ethylene oxide). Lorsqu'une pression est appliquée à la membrane, sa morphologie peut être ajustée grâce à la nature compressible des micelles, ainsi que les ponts dynamiques intermicellaires. Une gamme de porosités accessible peut être régulée par la pression et de manière à contrôler la performance de filtration. La même nature dynamique a également été utilisée pour montrer une réparation autonome entrainée par la pression. L'efficacité du processus de réparation dépend de la taille des fissures, de la valeur de pression et de la durée d'application de la pression. En utilisant la propriété d'auto-réparation de la membrane ci-dessus, le processus « Direct Mode Translocation » de nanoparticules a également été étudié. Quatre classes différentes de nanoparticules ont été utilisées avec diverses propriétés intrinsèques et extrinsèques. Les conclusions de ces travaux prouvent que les caractéristiques de taille, de forme et de surface des nanoparticules ainsi que la force exercée régissent le processus de translocation. Dans une seconde partie, un revêtement 2D et 3D réversible basé sur l'auto-assemblage de micelles de copolymère dibloc constitué d'un poly (methyl methacrylate) (PMMA) et du poly (n-octadecyl methacrylate) (PODMA) blocs a été développé. L'assemblage de micelles est réalisé par l'effet "Zipper", grâce aux longues chaînes pendantes du bloc PODMA. Le même effet "Zipper" permet d'enlever facilement le revêtement par lavage dans un solvant sélectif, donnant ainsi la possibilité de modifier la surface d'un substrat plusieurs fois de manière réversible. La cristallisation à température ambiante du bloc PODMA offre la possibilité d'avoir un revêtement auto-réparable thermiquement sans affecter la morphologie globale des micelles. Enfin, une dernière partie a été conceptualisée, dans laquelle l'auto-réparation se fait par « nano-gel » encapsulés et dispersés dans une membrane. Le « nano-gel » est à base d'un copolymère hydrophile en forme d'une étoile partiellement réticulée et qui doit être synthétisée par la technique de "Reversible Addition-Fragmentation Transfer" (RAFT) polymérisation. La synthèse d'un agent RAFT avec 4 bras pour la polymérisation a été accomplie, cependant, des travaux sont encore nécessaires pour valider la voie de synthèse vers la synthèse de « nano-gel » ainsi que son application pour le processus d'auto-réparation.

The objective of this thesis is to develop such kind of polymeric membranes which can repair themselves autonomously in an event of…

Advisors/Committee Members: Lagerge, Serge (thesis director), Quémener, Damien (thesis director).

Subjects/Keywords: Auto-réparation; Copolymère à blocs; Translocation; Membranes; Polymérisation radicalaire contrôlée; Self-healing; Block copolymer; Translocation; Membranes; Controlled radical polymerization

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

APA (6^th Edition):

Tyagi, P. (2012). Elaboration de membranes polymères auto-réparables : Elaboration of self-healing polymer membranes. (Doctoral Dissertation). Montpellier, Ecole nationale supérieure de chimie; Ecole nationale supérieure de chimie (Montpellier). Retrieved from http://www.theses.fr/2012ENCM0015

Chicago Manual of Style (16^th Edition):

Tyagi, Prashant. “Elaboration de membranes polymères auto-réparables : Elaboration of self-healing polymer membranes.” 2012. Doctoral Dissertation, Montpellier, Ecole nationale supérieure de chimie; Ecole nationale supérieure de chimie (Montpellier). Accessed January 22, 2021. http://www.theses.fr/2012ENCM0015.

MLA Handbook (7^th Edition):

Tyagi, Prashant. “Elaboration de membranes polymères auto-réparables : Elaboration of self-healing polymer membranes.” 2012. Web. 22 Jan 2021.

Vancouver:

Tyagi P. Elaboration de membranes polymères auto-réparables : Elaboration of self-healing polymer membranes. [Internet] [Doctoral dissertation]. Montpellier, Ecole nationale supérieure de chimie; Ecole nationale supérieure de chimie (Montpellier); 2012. [cited 2021 Jan 22]. Available from: http://www.theses.fr/2012ENCM0015.

Council of Science Editors:

Tyagi P. Elaboration de membranes polymères auto-réparables : Elaboration of self-healing polymer membranes. [Doctoral Dissertation]. Montpellier, Ecole nationale supérieure de chimie; Ecole nationale supérieure de chimie (Montpellier); 2012. Available from: http://www.theses.fr/2012ENCM0015

Pontifical Catholic University of Rio de Janeiro

26. CLAUDIO VIDAL TEIXEIRA. [en] REACTIVITY CONTROLLED COMPRESION IGNITION WITH DOUBLE DIRECT INJECTION DIESEL-ETHANOL.

Degree: 2019, Pontifical Catholic University of Rio de Janeiro

URL: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36558

►

[pt] Uma tecnologia desenvolvida na Universidade de Wisconsin-Madison denominada de Reactivity Controlled Compression Ignition (RCCI) usa dois injetores, por cilindro, para misturar combustível de baixa-reação… (more)

▼

[pt] Uma tecnologia desenvolvida na Universidade de Wisconsin-Madison denominada de Reactivity Controlled Compression Ignition (RCCI) usa dois injetores, por cilindro, para misturar combustível de baixa-reação (gasolina) com combustível de alta-reação (diesel) em um motor de ignição por compressão (ICO). Esta técnica possibilitou maior controle do processo de combustão, diminuição do consumo de combustível e dos gases de exaustão prejudiciais ao meio ambiente.Neste trabalho foi utilizado um motor ICO monocilíndrico, modificado para operar com tecnologia RCCI, injetando diesel e etanol diretamente na câmara de combustão. O objetivo era alcançar a maior taxa de substituição de diesel por etanol, utilizando estratégias de dupla e tripla injeção de combustível. Os resultados dos testes mostram que, operando com a estratégia de dupla injeção de combustível (etanol à -170 graus PMS e diesel a -8 graus PMS), a eficiência do motor modificado melhorou, mas surgiram pontos de alta pressão no interior do cilindro capazes de danificar o motor. Utilizando outra estratégia de dupla injeção de combustível (diesel a -8 graus PMS e etanol à +4 graus PMS) não foram constatados pontos de alta pressão no interior do cilindro, mas ocorreu um decréscimo na eficiência. Os resultados mais promissores foram obtidos empregando a estratégia de tripla injeção de combustível (etanol à -170 graus PMS, diesel a -8 graus PMS e etanol à + 4graus PMS): a eficiência aumentou e foi alcançada a maior taxa de substituição de diesel por etanol (74,6 por cento).

[en] A technology developed at the University of Wisconsin-Madison called Reactivity Controlled Compression Ignition (RCCI) uses two injectors, per cylinder, to mix low-reaction fuel (gasoline) with high-reaction (diesel) fuel ignition (ICO). This technique allowed greater control of the combustion process, reduction of fuel consumption and exhaust gases harmful to the environment. In this work was used a single-cylinder compression ignition (IC) engine, modified to operate with RCCI technology, injecting diesel and ethanol directly into the combustion chamber. The objective was to achieve the highest rate of substitution of diesel by ethanol, using double and triple fuel injection strategies. Test results show that modified engine efficiency improved when the dual fuel injection strategy (ethanol at -170 degrees PMS and diesel at -8 degrees PMS) was used, but high pressure points appeared inside the cylinder that could damage the engine. Using another dual fuel injection strategy (diesel at -8 degrees PMS and ethanol at + 4 degrees PMS) no pressure peaks were detected inside the cylinder, but a decrease in efficiency occurred. The most promising results were obtained using the triple fuel injection strategy (ethanol at -170 degrees PMS, diesel at -8 degrees PMS and ethanol at + 4 degrees PMS): efficiency increased and the highest diesel substitution rate by ethanol was achieve (74,6 percent).

Advisors/Committee Members: SERGIO LEAL BRAGA.

Subjects/Keywords: [pt] DIESEL; [en] DIESEL; [pt] ETANOL; [en] ETHANOL; [pt] IGNICAO POR COMPRESSAO COM REATIVIDADE CONTROLADA; [en] REACTIVITY CONTROLLED COMPRESSION IGNITION; [pt] RCCI; [en] RCCI

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APA (6^th Edition):

TEIXEIRA, C. V. (2019). [en] REACTIVITY CONTROLLED COMPRESION IGNITION WITH DOUBLE DIRECT INJECTION DIESEL-ETHANOL. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36558

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):

TEIXEIRA, CLAUDIO VIDAL. “[en] REACTIVITY CONTROLLED COMPRESION IGNITION WITH DOUBLE DIRECT INJECTION DIESEL-ETHANOL.” 2019. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed January 22, 2021. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36558.

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

MLA Handbook (7^th Edition):

TEIXEIRA, CLAUDIO VIDAL. “[en] REACTIVITY CONTROLLED COMPRESION IGNITION WITH DOUBLE DIRECT INJECTION DIESEL-ETHANOL.” 2019. Web. 22 Jan 2021.

Vancouver:

TEIXEIRA CV. [en] REACTIVITY CONTROLLED COMPRESION IGNITION WITH DOUBLE DIRECT INJECTION DIESEL-ETHANOL. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2019. [cited 2021 Jan 22]. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36558.

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

Council of Science Editors:

TEIXEIRA CV. [en] REACTIVITY CONTROLLED COMPRESION IGNITION WITH DOUBLE DIRECT INJECTION DIESEL-ETHANOL. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2019. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36558

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

Michigan Technological University

27. Soloukmofrad, Ali. MODEL-BASED CONTROL OF HYBRID ELECTRIC POWERTRAINS INTEGRATED WITH LOW TEMPERATURE COMBUSTION ENGINES.

Degree: PhD, Department of Mechanical Engineering-Engineering Mechanics, 2017, Michigan Technological University

URL: https://digitalcommons.mtu.edu/etdr/384

► Powertrain electrification including hybridizing advanced combustion engines is a viable cost-effective solution to improve fuel economy of vehicles. This will provide opportunity for narrow-range… (more)

▼ Powertrain electrification including hybridizing advanced combustion engines is a viable cost-effective solution to improve fuel economy of vehicles. This will provide opportunity for narrow-range high-efficiency combustion regimes to be able to operate and consequently improve vehicle’s fuel conversion efficiency, compared to conventional hybrid electric vehicles (HEV)s. Low temperature combustion (LTC) engines offer the highest peak brake thermal efficiency reported in literature, but these engines have narrow operating range. In addition, LTC engines have ultra-low soot and nitrogen oxides (NOx) emissions, compared to conventional compression ignition and spark ignition (SI) engines. This dissertation concentrates on integrating the LTC engines (i) in series HEV and extended range electric vehicle (E-REV) architectures which decouple the engine from the drivetrain and allow the ICE to operate fully in a dedicated LTC mode, and (ii) a parallel HEV architecture to investigate optimum performance for fuel saving by utilizing electric torque assist level offered by e-motor. An electrified LTC-SI powertrain test setup is built at Michigan Technological University to develop the powertrain efficiency maps to be used in energy management control (EMC) framework. Three different types of Energy Management Control (EMC) strategies are developed. The EMC strategies encompass thermostatic rule-based control (RBC), offline (i.e., dynamic programing (DP) and pontryagin’s minimum principal (PMP)), and online optimization (i.e., model predictive control (MPC)). The developed EMC strategies are then implemented on experimentally validated HEV powertrain model to investigate the powertrain fuel economy. A dedicated single-mode homogeneous charge compression ignition (HCCI) and reactivity controlled compression ignition (RCCI) engines are integrated with series HEV powertrain. The results show up to 17.7% and 14.2% fuel economy saving of using HCCI and RCCI, respectively in series HEV compared to modern SI engine in the similar architecture. In addition, the MPC results show that sub-optimal fuel economy is achieved by predicting the vehicle speed profile for a time horizon of 70 sec. Furthermore, a multi-mode LTC-SI engine is integrated in both series and parallel HEVs. The developed multi-mode LTC-SI engine enables flexibility in combustion mode-switching over the driving cycle, which helps to improve the overall fuel economy. The engine operation modes include HCCI, RCCI, and SI modes. The powertrain controller is designed to enable switching among different modes, with minimum fuel penalty for transient engine operations. In the parallel HEV architecture, the results for the UDDS driving cycle show the maximum benefit of the multi-mode LTCSI engine is realized in the mild electrification level, where the LTC mode operating time increases dramatically from 5.0% in Plug-in Hybrid Electric Vehicle (PHEV) to 20.5% in mild HEV. Advisors/Committee Members: Mahdi Shahbakhti.

Subjects/Keywords: Low Temperature Combustion engine; hybrid electric vehicles; homogeneous charge compression ignition; reactivity controlled compression ignition; energy management control; powertrain electrification;

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APA (6^th Edition):

Soloukmofrad, A. (2017). MODEL-BASED CONTROL OF HYBRID ELECTRIC POWERTRAINS INTEGRATED WITH LOW TEMPERATURE COMBUSTION ENGINES. (Doctoral Dissertation). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/384

Chicago Manual of Style (16^th Edition):

Soloukmofrad, Ali. “MODEL-BASED CONTROL OF HYBRID ELECTRIC POWERTRAINS INTEGRATED WITH LOW TEMPERATURE COMBUSTION ENGINES.” 2017. Doctoral Dissertation, Michigan Technological University. Accessed January 22, 2021. https://digitalcommons.mtu.edu/etdr/384.

MLA Handbook (7^th Edition):

Soloukmofrad, Ali. “MODEL-BASED CONTROL OF HYBRID ELECTRIC POWERTRAINS INTEGRATED WITH LOW TEMPERATURE COMBUSTION ENGINES.” 2017. Web. 22 Jan 2021.

Vancouver:

Soloukmofrad A. MODEL-BASED CONTROL OF HYBRID ELECTRIC POWERTRAINS INTEGRATED WITH LOW TEMPERATURE COMBUSTION ENGINES. [Internet] [Doctoral dissertation]. Michigan Technological University; 2017. [cited 2021 Jan 22]. Available from: https://digitalcommons.mtu.edu/etdr/384.

Council of Science Editors:

Soloukmofrad A. MODEL-BASED CONTROL OF HYBRID ELECTRIC POWERTRAINS INTEGRATED WITH LOW TEMPERATURE COMBUSTION ENGINES. [Doctoral Dissertation]. Michigan Technological University; 2017. Available from: https://digitalcommons.mtu.edu/etdr/384

University of Michigan

28. He, Xin. An investigation of iso -octane auto-ignition using a rapid compression facility.

Degree: PhD, Mechanical engineering, 2005, University of Michigan

URL: http://hdl.handle.net/2027.42/125380

► Homogeneous charge compression ignition (HCCI) is a category of low temperature combustion (LTC), which represents a potential major advancement in high-efficiency, low-emissions engines. Although HCCI… (more)

▼ Homogeneous charge compression ignition (HCCI) is a category of low temperature combustion (LTC), which represents a potential major advancement in high-efficiency, low-emissions engines. Although HCCI engines have been demonstrated to operate well under certain conditions, obstacles have been encountered at high-load, cold-start and during transient operating conditions. Thus, an extensive understanding of HCCI combustion is required to address technology barriers and develop valuable control strategies for HCCI engines. The study of iso-octane auto-ignition is of particular interest because iso-octane is one of the primary reference fuels that determine octane numbers. In this work, auto-ignition of iso-octane was examined using a rapid-compression facility (RCF) with iso-octane, oxygen, nitrogen and argon mixtures. The effects of HCCI conditions on the iso-octane ignition characteristics, including ignition delay time, time-resolved OH time histories, and detailed speciation at select times, were studied. Experimental results for iso-octane ignition delay times, tau_ign, were obtained over a range of equivalence ratios (&phis; = 0.25-1.0), pressures (P = 5.12-23 atm), temperatures (T = 943-1027 K), oxygen mole fractions (chi_O2 = 9-21%), and with the addition of trace amounts of combustion product gases (CO₂ and H₂O). The ignition delay times were well represented by the expression:<display-math> <fd> tign=1.3x10-4˙P -1.05˙f-0.77˙cO 2-1.41 ˙exp33700/R cal/mol/k</fen>T</fen> . </fd> </display-math> Absolute quantitative OH mole fraction time histories were obtained using differential narrow-line laser absorption of the R₁(5) line of the A²&Sgr;⁺←X²product_i(0,0) band of the OH spectrum (nu_o = 32606.56 cm^-1). For these experiments, diluted iso-octane/argon/nitrogen/oxygen mixtures were used with fuel/oxygen equivalence ratios from &phgr; = 0.25 to 0.35. The pressures and temperatures after compression ranged from 8.5 to 15 atm and from 945 to 1020 K, respectively. Intermediate species were quantified by chemically quenching the test gases in the core region at various times during the combustion process via rapid expansion into a vacuum chamber. The composition of the contents in the sampling chamber was analyzed using gas chromatography for stable species, hydrocarbons (C1-C8), and oxygenates. The speciation experiments were conducted at fuel lean (&phgr; = 0.4) and fuel rich (&phgr; = 1.2) conditions. The experimental results of this work provide data critical for the development of LTC engine technologies, particularly kinetically controlled HCCI engines. The data also have direct relevance to other LTC applications where the reaction kinetics affects combustion performance. Quantitative understanding of iso-octane ignition characteristics at lean, low temperature, and moderate pressure conditions can now applied with confidence. Advisors/Committee Members: Atreya, Arvind (advisor), Wooldridge, Margaret S. (advisor).

Subjects/Keywords: Auto; Autoignition; Facility; Ignition; Investigation; Iso-octane; Rapid Compression; Using

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APA (6^th Edition):

He, X. (2005). An investigation of iso -octane auto-ignition using a rapid compression facility. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/125380

Chicago Manual of Style (16^th Edition):

He, Xin. “An investigation of iso -octane auto-ignition using a rapid compression facility.” 2005. Doctoral Dissertation, University of Michigan. Accessed January 22, 2021. http://hdl.handle.net/2027.42/125380.

MLA Handbook (7^th Edition):

He, Xin. “An investigation of iso -octane auto-ignition using a rapid compression facility.” 2005. Web. 22 Jan 2021.

Vancouver:

He X. An investigation of iso -octane auto-ignition using a rapid compression facility. [Internet] [Doctoral dissertation]. University of Michigan; 2005. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2027.42/125380.

Council of Science Editors:

He X. An investigation of iso -octane auto-ignition using a rapid compression facility. [Doctoral Dissertation]. University of Michigan; 2005. Available from: http://hdl.handle.net/2027.42/125380

University of Michigan

29. Sankaran, Ramanan. A computational study of auto-ignition and flame propagation in stratified mixtures relevant to modern engines.

Degree: PhD, Mechanical engineering, 2004, University of Michigan

URL: http://hdl.handle.net/2027.42/124554

► Numerical simulations are performed to study the nature of auto-ignition and flame propagation in a stratified mixture. The results of this study are expected to… (more)

▼ Numerical simulations are performed to study the nature of auto-ignition and flame propagation in a stratified mixture. The results of this study are expected to provide a fundamental understanding of the combustion occurring in direct injection spark ignition (DISI) and homogeneous charge compression ignition (HCCI) engines. In the first part, the effect of time varying composition on a premixed methane-air flame is studied using a counterflow configuration and the concept of dynamic flammability limit is established to quantify the extension in flammability limit under unsteady situations. In addition, the effects of blending hydrogen to methane are studied as a possible means to improve the stability of lean premixed combustion. It is found that hydrogen blending substantially affects the diffusive-thermal stability while the dynamic response is unchanged. The second part of the dissertation is devoted to a fundamental study of ignition characteristics relevant to HCCI engines. Models at various levels of complexity are attempted, ranging from a homogenous reactor model to direct numerical simulation (DNS). First, the mixing of exhaust gas recirculation (EGR) on HCCI combustion are investigated for their benefit of knock reduction. Results obtained using a homogenous reactor model suggest that the effects of EGR is predominantly thermal than chemical for the conditions under study. This leads to a closer examination of the thermo-physical aspects of EGR on HCCI combustion due to incomplete mixing and mixture stratification. High-fidelity DNS studies are thus performed to assess the effects of the initial temperature distribution on ignition and subsequent heat release. For the three test cases considered, the presence of hotter core gas leads to early ignition and increased duration of burning, while a cold core leaves dormant end gas which is consumed by slow combustion. Finally, as a more extensive parametric study to quantify the effects of mixing rate on HCCI ignition, the ignition and propagation of a reaction front in a premixed fuel/air stream mixed with hotter exhaust gases is investigated using the counterflow configuration. The results provide a systematic framework to identify two distinct regimes of ignition, namely the spontaneous propagation and the deflagration regimes. A criterion based on the ratio of the time scales of auto-ignition and diffusion is proposed to identify the transition between these two regimes. Implications of the different regimes in the development of submodels for HCCI modeling are discussed. Advisors/Committee Members: Im, Hong G. (advisor).

Subjects/Keywords: Auto; Autoignition; Combustion; Computational; Engines; Flame Propagation; Ignition; Modern; Relevant; Stratified Mixtures; Study

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

APA (6^th Edition):

Sankaran, R. (2004). A computational study of auto-ignition and flame propagation in stratified mixtures relevant to modern engines. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/124554

Chicago Manual of Style (16^th Edition):

Sankaran, Ramanan. “A computational study of auto-ignition and flame propagation in stratified mixtures relevant to modern engines.” 2004. Doctoral Dissertation, University of Michigan. Accessed January 22, 2021. http://hdl.handle.net/2027.42/124554.

MLA Handbook (7^th Edition):

Sankaran, Ramanan. “A computational study of auto-ignition and flame propagation in stratified mixtures relevant to modern engines.” 2004. Web. 22 Jan 2021.

Vancouver:

Sankaran R. A computational study of auto-ignition and flame propagation in stratified mixtures relevant to modern engines. [Internet] [Doctoral dissertation]. University of Michigan; 2004. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2027.42/124554.

Council of Science Editors:

Sankaran R. A computational study of auto-ignition and flame propagation in stratified mixtures relevant to modern engines. [Doctoral Dissertation]. University of Michigan; 2004. Available from: http://hdl.handle.net/2027.42/124554

Northeastern University

30. Elia, Mimmo. Measurement apparatus and modelling of laminar burning speed and mass burning rate of syngas and onset of auto-ignition of N-heptane and gas to liquid fuel.

Degree: PhD, Department of Mechanical and Industrial Engineering, 2016, Northeastern University

URL: http://hdl.handle.net/2047/D20211318

► Research studies into understanding the fundamental thermodynamic properties of Syngas are extremely relevant in engineering combustion modelling for stationary turbine based power plants and for… (more)

▼ Research studies into understanding the fundamental thermodynamic properties of Syngas are extremely relevant in engineering combustion modelling for stationary turbine based power plants and for IC engines. The models rely heavily on accurate experimental results and of critical importance is the data for: chemical kinetic rates, mass burning rate and auto-ignition conditions. To produce some of this necessary data, an experimental facility capable of measuring the pressure rise from spherically expanding flames was developed. The first core component of the facility includes a spherical combustion vessel that enables the measurement of the pressure rise from a combustion process, at high initial temperature and pressure. The second core component of the facility, which includes a lower pressure cylindrical combustion vessel, with optically clear sides, enables the direct measurement of laminar flame speed as well as the visualization of expanding spherical flames for the study of flame structures. An improved model to complement the experimental measurements has been developed. Using the thermodynamic model, the mass burning rate and laminar burning speed can be calculated from the pressure data measured using one of the two constant volume combustion vessels. The model is used to calculate the mass fraction of the burned gas by simultaneously solving the conservation of mass and energy equations coupled with equilibrium concentrations calculation of the combustion products using STANJAN. For smooth non-cellular flames laminar burning speed can be also calculated. The facility and model have been used and improved by many of the researchers at Northeastern University with results published in a variety of technical journals, and thus expanding the measured range of laminar flame speed. This thesis will describe in detail the experimental apparatus and report the laminar burning speed and mass burning rate for Syngas-Air and Syngas-O₂-He at high temperature and pressure as well as auto-ignition characteristics of n-Heptane and GTL (S8), which is a synthetic surrogate for aviation fuel.

Subjects/Keywords: auto-ignition; GTL; laminar burning speed; mass burning speed; S8; syngas; Synthesis gas; Combustion; Combustion; Combustion chambers; Gas as fuel; Flame; Chemical kinetics

Record Details Similar Records Cite « Share

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

APA (6^th Edition):

Elia, M. (2016). Measurement apparatus and modelling of laminar burning speed and mass burning rate of syngas and onset of auto-ignition of N-heptane and gas to liquid fuel. (Doctoral Dissertation). Northeastern University. Retrieved from http://hdl.handle.net/2047/D20211318

Chicago Manual of Style (16^th Edition):

Elia, Mimmo. “Measurement apparatus and modelling of laminar burning speed and mass burning rate of syngas and onset of auto-ignition of N-heptane and gas to liquid fuel.” 2016. Doctoral Dissertation, Northeastern University. Accessed January 22, 2021. http://hdl.handle.net/2047/D20211318.

MLA Handbook (7^th Edition):

Elia, Mimmo. “Measurement apparatus and modelling of laminar burning speed and mass burning rate of syngas and onset of auto-ignition of N-heptane and gas to liquid fuel.” 2016. Web. 22 Jan 2021.

Vancouver:

Elia M. Measurement apparatus and modelling of laminar burning speed and mass burning rate of syngas and onset of auto-ignition of N-heptane and gas to liquid fuel. [Internet] [Doctoral dissertation]. Northeastern University; 2016. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2047/D20211318.

Council of Science Editors:

Elia M. Measurement apparatus and modelling of laminar burning speed and mass burning rate of syngas and onset of auto-ignition of N-heptane and gas to liquid fuel. [Doctoral Dissertation]. Northeastern University; 2016. Available from: http://hdl.handle.net/2047/D20211318

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Open Access Theses and Dissertations