subject:(Diesel Homogeneous Charge Compression Ignition)

University of Bradford

1. Ghomashi, Hossein. Modelling the combustion in a dual fuel HCCI engine : investigation of knock, compression ratio, equivalence ratio and timing in a Homogeneous Charge Compression Ignition (HCCI) engine with natural gas and diesel fuels using modelling and simulation.

Degree: PhD, 2013, University of Bradford

URL: http://hdl.handle.net/10454/7344

► This thesis is about modelling of the combustion and emissions of dual fuel HCCI engines for design of “engine combustion system”. For modelling the combustion… (more)

▼ This thesis is about modelling of the combustion and emissions of dual fuel HCCI engines for design of “engine combustion system”. For modelling the combustion first the laminar flamelet model and a hybrid Lagrangian / Eulerian method are developed and implemented to provide a framework for incorporating detailed chemical kinetics. This model can be applied to an engine for the validation of the chemical kinetic mechanism. The chemical kinetics, reaction rates and their equations lead to a certain formula for which the coefficients can be obtained from different sources, such as NASA polynomials [1]. This is followed by study of the simulation results and significant findings. Finally, for investigation of the knock phenomenon some characteristics such as compression ratio, fuel equivalence ratio, spark timing and their effects on the performance of an engine are examined and discussed. The OH radical concentration (which is the main factor for production of knock) is evaluated with regard to adjustment of the above mentioned characteristic parameters. In the second part of this work the specification of the sample engine is given and the results obtained from simulation are compared with experimental results for this sample engine, in order to validate the method applied in AVL Fire software. This method is used to investigate and optimize the effects of parameters such as inlet temperature, fuels ratio, diesel fuel injection timing, engine RPM and EGR on combustion in a dual fuel HCCI engine. For modelling the dual fuel HCCI engine AVL FIRE software is applied to simulate the combustion and study the optimization of a combustion chamber design. The findings for the dual fuel HCCI engine show that the mixture of methane and diesel fuel has a great influence on an engine's power and emissions. Inlet air temperature has also a significant role in the start of combustion so that inlet temperature is a factor in auto-ignition. With an increase of methane fuel, the burning process will be more rapid and oxidation becomes more complete. As a result, the amounts of CO and HC emissions decrease remarkably. With an increase of premixed ratio beyond a certain amount, NOX emissions decrease. With pressure increases markedly and at high RPM, knock phenomenon is observed in HCCI combustion.

Subjects/Keywords: 621.43; Homogeneous Charge Compression Ignition (HCCI) engine, Dual fuel, Diesel, Gas, Modelling, Emission, Simulation, Combustion

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APA (6^th Edition):

Ghomashi, H. (2013). Modelling the combustion in a dual fuel HCCI engine : investigation of knock, compression ratio, equivalence ratio and timing in a Homogeneous Charge Compression Ignition (HCCI) engine with natural gas and diesel fuels using modelling and simulation. (Doctoral Dissertation). University of Bradford. Retrieved from http://hdl.handle.net/10454/7344

Chicago Manual of Style (16^th Edition):

Ghomashi, Hossein. “Modelling the combustion in a dual fuel HCCI engine : investigation of knock, compression ratio, equivalence ratio and timing in a Homogeneous Charge Compression Ignition (HCCI) engine with natural gas and diesel fuels using modelling and simulation.” 2013. Doctoral Dissertation, University of Bradford. Accessed February 28, 2021. http://hdl.handle.net/10454/7344.

MLA Handbook (7^th Edition):

Ghomashi, Hossein. “Modelling the combustion in a dual fuel HCCI engine : investigation of knock, compression ratio, equivalence ratio and timing in a Homogeneous Charge Compression Ignition (HCCI) engine with natural gas and diesel fuels using modelling and simulation.” 2013. Web. 28 Feb 2021.

Vancouver:

Ghomashi H. Modelling the combustion in a dual fuel HCCI engine : investigation of knock, compression ratio, equivalence ratio and timing in a Homogeneous Charge Compression Ignition (HCCI) engine with natural gas and diesel fuels using modelling and simulation. [Internet] [Doctoral dissertation]. University of Bradford; 2013. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/10454/7344.

Council of Science Editors:

Ghomashi H. Modelling the combustion in a dual fuel HCCI engine : investigation of knock, compression ratio, equivalence ratio and timing in a Homogeneous Charge Compression Ignition (HCCI) engine with natural gas and diesel fuels using modelling and simulation. [Doctoral Dissertation]. University of Bradford; 2013. Available from: http://hdl.handle.net/10454/7344

Indian Institute of Science

2. Pandey, Sunil Kumar. Exploration And Assessment of HCCI Strategies for a Multi-Cylinder Heavy-Duty Diesel Engine.

Degree: PhD, Faculty of Engineering, 2017, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/2720

► Homogeneous Charge Compression Ignition (HCCI) combustion is an alternative combustion mode in which the fuel is homogeneously mixed with air and is auto-ignited by compression.… (more)

▼ Homogeneous Charge Compression Ignition (HCCI) combustion is an alternative combustion mode in which the fuel is homogeneously mixed with air and is auto-ignited by compression. Due to charge homogeneity, this mode is characterized by low equivalence ratios and temperatures giving simultaneously low nitric oxide (NOx) and soot in diesel engines. The conventional problem of NOx-soot trade-off is avoided in this mode due to absence of diffusion combustion. This mode can be employed at part load conditions while maintaining conventional combustion at high load thus minimizing regulatory cycle emissions and reducing cost of after-treatment systems. The present study focuses on achieving this mode in a turbocharged, common rail, direct injection, four-cylinder, heavy duty diesel engine. Specifically, the work involves a combination of three-dimensional CFD simulations and experiments on this engine to assess both traditional and novel strategies related to fuel injection. The first phase of the work involved a quasi-dimensional simulation of the engine to assess potential of achieving HCCI. This was done using a zero-dimensional, single-zone HCCI combustion model with n-heptane skeletal chemistry along with a one-dimensional model of intake and exhaust systems. The feasibility of operation with realistic knock values with high EGR rate of 60% was observed. The second aspect of the work involved three-dimensional CFD simulations of the in-cylinder process with wall film prediction to evaluate injection strategies associated with Early Direct Injection (EDI). The extended Coherent Flame Model-3Zone (ECFM-3Z) was employed for combustion simulation of conventional CI and EDI, and was validated with experimental in-cylinder pressure data from the engine. A new Uniformity Index (UI) parameter was defined to assess charge homogeneity. Results showed significant in-homogeneity and presence of wall film for EDI. Simulations were conducted to assess improvement of charge homogeneity by several strategies; narrow spray cone angle, injection timing, multiple injections, intake air heating, Port Fuel Injection (PFI) as well as combination of PFI and EDI. The maximum UI achieved by EDI was 0.78. The PFI strategy could achieve UI of 0.95; however, up to 50% of fuel remained trapped in the port after valve closure. This indicated that except EDI, none of the above-mentioned strategies could help achieve the benefits of the HCCI mode. The third part of the work involved engine experimentation to assess the EDI strategy. This strategy produced lower soot than that of conventional CI combustion with very short combustion duration, but led to high knock and NOx which is attributed to pool fire burning phenomenon of the wall film, as confirmed by CFD. An Optimized EDI (OptimEDI) strategy was then developed based on results of CFD and Design of Experiments. The Optim EDI consisted of triple injections with split ratio of 41%-45%-14% and advancing the first injection. This strategy gave 20% NOx and soot reduction over the conventional CI… Advisors/Committee Members: Ravikrishna, R V (advisor).

Subjects/Keywords: Homogeneous Charge Compression Ignition Engines (HCCI); Low Temperature Combustion; Multi-Cylinder Heavy-Duty Diesel Engines; Diesel Motor; Diesel Engines; Early Direct Injection; Air-Assisted Injection; Combustion; Diesel Homogeneous Charge Compression Ignition; Diesel Fuels; Diesel-Fueled Engines; Fuel Injection; Internal Combustion Engines; Computational Fluid Dynamics; Mechanical Engineering

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APA (6^th Edition):

Pandey, S. K. (2017). Exploration And Assessment of HCCI Strategies for a Multi-Cylinder Heavy-Duty Diesel Engine. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2720

Chicago Manual of Style (16^th Edition):

Pandey, Sunil Kumar. “Exploration And Assessment of HCCI Strategies for a Multi-Cylinder Heavy-Duty Diesel Engine.” 2017. Doctoral Dissertation, Indian Institute of Science. Accessed February 28, 2021. http://etd.iisc.ac.in/handle/2005/2720.

MLA Handbook (7^th Edition):

Pandey, Sunil Kumar. “Exploration And Assessment of HCCI Strategies for a Multi-Cylinder Heavy-Duty Diesel Engine.” 2017. Web. 28 Feb 2021.

Vancouver:

Pandey SK. Exploration And Assessment of HCCI Strategies for a Multi-Cylinder Heavy-Duty Diesel Engine. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2017. [cited 2021 Feb 28]. Available from: http://etd.iisc.ac.in/handle/2005/2720.

Council of Science Editors:

Pandey SK. Exploration And Assessment of HCCI Strategies for a Multi-Cylinder Heavy-Duty Diesel Engine. [Doctoral Dissertation]. Indian Institute of Science; 2017. Available from: http://etd.iisc.ac.in/handle/2005/2720

Anna University

3. Ganesh D. A study on homogeneous charge compression ignition HCCI combustion of diesel fuel with external mixture formation;.

Degree: 2013, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/11426

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Conventional diesel engines operate at higher compression ratios than SI engines. In this type of engine, the air-fuel mixture auto-ignites because of piston compression instead… (more)

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Conventional diesel engines operate at higher compression ratios than SI engines. In this type of engine, the air-fuel mixture auto-ignites because of piston compression instead of ignition by spark plug. These processes effectively limit the rate of combustion. The in-cylinder temperature in a conventional diesel engine is about 2700 K, which leads to a significant production of Oxides of Nitrogen (NOx) emissions. For diesel engines, a trade-off made between NOx and soot. After treatment systems are used in the modern day engines which are expensive. Consequently, the obvious ideal combination would be to find an engine type with high efficiency as that of diesel engines and very low emissions as that of gasoline engines with catalytic converters. One such technology is homogeneous charge compression ignition (HCCI). In the present work, homogeneous mixture was prepared outside the combustion chamber (External mixture formation) by using Ultrasonic fuel injection (USFI) system and Diesel fuel vapouriser system. The key to the external mixture formation method with diesel is proper fuel preparation. In the first approach, the Ultra sonic atomiser receives diesel fuel in liquid state and by means of ultrasonic vibration energy, performs work on the fuel, transforming it to a highly atomised state and then effectively mixing with air to form a more uniform fuel- air mixture. Similarly, in the second approach, the Diesel fuel vapouriser receives fuel in liquid state and it converts into vapour form by means of an external power source, and effectively mixes with the incoming air to form a uniform fuel-air mixture. The experimental results show that, NOx and smoke reduces by about 80 % and 92 % respectively with USFI system. Whereas, in Diesel fuel vapouriser (DFV) system, the NOx and smoke reduction is about 95 % and 83 % respectively. The engine operated from no load to 75 % load without any problem in the case of diesel fuel vaporiser system, whereas in USFI system the engine operated between 25% to 75% load on

Appendices 1 to 7; pp. 125-132

Advisors/Committee Members: Nagarajan, G..

Subjects/Keywords: Homogeneous charge compression ignition(HCCI); diesel fuel; oxides of nitrogen; ultrasonic fuel injection(USFI); external mixture formaiton

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APA (6^th Edition):

D, G. (2013). A study on homogeneous charge compression ignition HCCI combustion of diesel fuel with external mixture formation;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/11426

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):

D, Ganesh. “A study on homogeneous charge compression ignition HCCI combustion of diesel fuel with external mixture formation;.” 2013. Thesis, Anna University. Accessed February 28, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/11426.

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

MLA Handbook (7^th Edition):

D, Ganesh. “A study on homogeneous charge compression ignition HCCI combustion of diesel fuel with external mixture formation;.” 2013. Web. 28 Feb 2021.

Vancouver:

D G. A study on homogeneous charge compression ignition HCCI combustion of diesel fuel with external mixture formation;. [Internet] [Thesis]. Anna University; 2013. [cited 2021 Feb 28]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/11426.

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

Council of Science Editors:

D G. A study on homogeneous charge compression ignition HCCI combustion of diesel fuel with external mixture formation;. [Thesis]. Anna University; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/11426

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

University of California – Berkeley

4. Vuilleumier, David Malcolm. The Effect of Ethanol Addition to Gasoline on Low- and Intermediate-Temperature Heat Release under Boosted Conditions in Kinetically Controlled Engines.

Degree: Mechanical Engineering, 2016, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/6jd8g04n

► AbstractThe Effect of Ethanol Addition to Gasoline on Low- and Intermediate-Temperature Heat Release under Boosted Conditions in Kinetically Controlled EnginesbyDavid Malcolm VuilleumierDoctor of Philosophy in… (more)

▼ AbstractThe Effect of Ethanol Addition to Gasoline on Low- and Intermediate-Temperature Heat Release under Boosted Conditions in Kinetically Controlled EnginesbyDavid Malcolm VuilleumierDoctor of Philosophy in Mechanical EngineeringUniversity of California, BerkeleyProfessor Jyh-Yuan Chen, ChairThe detailed study of chemical kinetics in engines has become required to further advance engine efficiency while simultaneously lowering engine emissions. This push for higher efficiency engines is not caused by a lack of oil, but by efforts to reduce anthropogenic carbon dioxide emissions, that cause global warming. To operate in more efficient manners while reducing traditional pollutant emissions, modern internal combustion piston engines are forced to operate in regimes in which combustion is no longer fully transport limited, and instead is at least partially governed by chemical kinetics of combusting mixtures. Kinetically-controlled combustion allows the operation of piston engines at high compression ratios, with partially-premixed dilute charges; these operating conditions simultaneously provide high thermodynamic efficiency and low pollutant formation.The investigations presented in this dissertation study the effect of ethanol addition on the low-temperature chemistry of gasoline type fuels in engines. These investigations are carried out both in a simplified, fundamental engine experiment, named Homogeneous Charge Compression Ignition, as well as in more applied engine systems, named Gasoline Compression Ignition engines and Partial Fuel Stratification engines. These experimental investigations, and the accompanying modeling work, show that ethanol is an effective scavenger of radicals at low temperatures, and this inhibits the low temperature pathways of gasoline oxidation. Further, the investigations measure the sensitivity of gasoline auto-ignition to system pressure at conditions that are relevant to modern engines. It is shown that at pressures above 40 bar and temperatures below 850 Kelvin, gasoline begins to exhibit Low-Temperature Heat Release. However, the addition of 20% ethanol raises the pressure requirement to 60 bar, while the temperature requirement remains unchanged.These findings have major implications for a range of modern engines. Low-Temperature Heat Release significantly enhances the auto-ignition process, which limits the conditions under which advanced combustion strategies may operate. As these advanced combustion strategies are required to meet emissions and fuel-economy regulations, the findings of this dissertation may benefit and be incorporated into future engine design toolkits, such as detailed chemical kinetic mechanisms.

Subjects/Keywords: Mechanical engineering; Energy; Advanced Combustion Engines; Ethanol; Gasoline; Gasoline Compression Ignition; Homogeneous Charge Compression Ignition; Low-Temperature Heat Release

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

APA (6^th Edition):

Vuilleumier, D. M. (2016). The Effect of Ethanol Addition to Gasoline on Low- and Intermediate-Temperature Heat Release under Boosted Conditions in Kinetically Controlled Engines. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/6jd8g04n

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):

Vuilleumier, David Malcolm. “The Effect of Ethanol Addition to Gasoline on Low- and Intermediate-Temperature Heat Release under Boosted Conditions in Kinetically Controlled Engines.” 2016. Thesis, University of California – Berkeley. Accessed February 28, 2021. http://www.escholarship.org/uc/item/6jd8g04n.

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

MLA Handbook (7^th Edition):

Vuilleumier, David Malcolm. “The Effect of Ethanol Addition to Gasoline on Low- and Intermediate-Temperature Heat Release under Boosted Conditions in Kinetically Controlled Engines.” 2016. Web. 28 Feb 2021.

Vancouver:

Vuilleumier DM. The Effect of Ethanol Addition to Gasoline on Low- and Intermediate-Temperature Heat Release under Boosted Conditions in Kinetically Controlled Engines. [Internet] [Thesis]. University of California – Berkeley; 2016. [cited 2021 Feb 28]. Available from: http://www.escholarship.org/uc/item/6jd8g04n.

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

Council of Science Editors:

Vuilleumier DM. The Effect of Ethanol Addition to Gasoline on Low- and Intermediate-Temperature Heat Release under Boosted Conditions in Kinetically Controlled Engines. [Thesis]. University of California – Berkeley; 2016. Available from: http://www.escholarship.org/uc/item/6jd8g04n

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

5. Saisirirat, Peerawat. Etude de la combustion des mélanges hydrocarbures/alcools dans un moteur HCCI : A study of hydrocarbon/alcohol combustion in HCCI engines.

Degree: Docteur es, Mécanique. Energétique, 2011, Orléans; King Mongkut's university of technology Thonburi

URL: http://www.theses.fr/2011ORLE2020

►

Actuellement, les principaux thèmes pour le secteur de transport sont le réchauffement global et la crise énergétique, ce qui encourage les chercheurs à développer des… (more)

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Actuellement, les principaux thèmes pour le secteur de transport sont le réchauffement global et la crise énergétique, ce qui encourage les chercheurs à développer des technologies alternatives et efficaces. Le concept ‘HCCI’ (combustion d’une charge homogène, allumée par compression) est l’une des solutions pour le moteur de véhicules. Ce mode de combustion, indépendant d’une notion de propagation de flamme, permet de réduire fortement les émissions critiques de NOX et de suies dans les gaz d'échappement. Cette combustion de type HCCI du carburant diesel se caractérise par une combustion à deux étapes. Parallèlement, l’apparition de nouveaux carburants, comme le bio-alcool, est une autre voie de recherche. Les bio-alcools ont un nombre d’indice d'octane élevé qui peut se mélanger avec du carburant diesel pour optimiser la combustion de HCCI des carburants diesel. L’objectif de cette thèse est donc de caractériser les deux étapes de la combustion HCCI en étudiant l’influence de l’impact de l’ajout d’une fraction d’alcools dans diesel. La comparaison avec un mélange d’iso-octane, hydrocarbure à indice d'octane élevé de paraffine et des mélanges dilués via les gaz d’échappement est aussi analysée en tant que verrous potentiels pour améliorer la combustion de type HCCI. Dans cette thèse, le n-heptane est choisi comme composé principal représentatif du diesel, l'éthanol et 1-butanol sont choisis comme bio-alcools. L’analyse présentée ici se repose sur trois approches différentes : l’analyse expérimentale de la pression cylindre, l'analyse d'images de chimiluminescence spontanée de certaines espèces et les résultats issus de la modélisation cinétique de la combustion.

Currently, the major issues for the transportation sector are the global warming and energy crisis which encourage researchers to develop an alternative green efficient technology. The homogeneous charge compression ignition (HCCI) can be one of solutions for the automotive engine. This combustion concept is independent on the high temperature flame propagation which releases lowest critical emissions (NOX and PM) in the exhaust gas. HCCI combustion of diesel fuel presents specific characteristic of two-stage ignition that over-advances the main heat release. As the importance of bio-alcohol fuels increases, it is interesting to evaluate the potential of the fuels, to optimize the HCCI combustion of diesel fuels. This is the objective of this phD thesis. The two-stage ignition characteristic of the diesel hydrocarbon is described and the influence of alcohol fuel fraction in diesel blends is investigated in comparison with high octane paraffin hydrocarbon diesel blends and EGR addition. All potentials are concluded to the potential for HCCI combustion improvement. In this thesis, n-heptane was selected as the major diesel representative component and ethanol and 1-butanol as the considered alcohol fuels. Three approaches were used based on experimental cylinder pressure analysis, the chemiluminescence emissions image analysis and the chemical kinetic…

Advisors/Committee Members: Mounaïm-Rousselle, Christine (thesis director), Chanchaona, Somchai (thesis director).

Subjects/Keywords: Combustion d’une charge homogène allumée par compression; Bio!alcools; Homogeneous charge compression ignition; Bio!alcohol fuels

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

APA (6^th Edition):

Saisirirat, P. (2011). Etude de la combustion des mélanges hydrocarbures/alcools dans un moteur HCCI : A study of hydrocarbon/alcohol combustion in HCCI engines. (Doctoral Dissertation). Orléans; King Mongkut's university of technology Thonburi. Retrieved from http://www.theses.fr/2011ORLE2020

Chicago Manual of Style (16^th Edition):

Saisirirat, Peerawat. “Etude de la combustion des mélanges hydrocarbures/alcools dans un moteur HCCI : A study of hydrocarbon/alcohol combustion in HCCI engines.” 2011. Doctoral Dissertation, Orléans; King Mongkut's university of technology Thonburi. Accessed February 28, 2021. http://www.theses.fr/2011ORLE2020.

MLA Handbook (7^th Edition):

Saisirirat, Peerawat. “Etude de la combustion des mélanges hydrocarbures/alcools dans un moteur HCCI : A study of hydrocarbon/alcohol combustion in HCCI engines.” 2011. Web. 28 Feb 2021.

Vancouver:

Saisirirat P. Etude de la combustion des mélanges hydrocarbures/alcools dans un moteur HCCI : A study of hydrocarbon/alcohol combustion in HCCI engines. [Internet] [Doctoral dissertation]. Orléans; King Mongkut's university of technology Thonburi; 2011. [cited 2021 Feb 28]. Available from: http://www.theses.fr/2011ORLE2020.

Council of Science Editors:

Saisirirat P. Etude de la combustion des mélanges hydrocarbures/alcools dans un moteur HCCI : A study of hydrocarbon/alcohol combustion in HCCI engines. [Doctoral Dissertation]. Orléans; King Mongkut's university of technology Thonburi; 2011. Available from: http://www.theses.fr/2011ORLE2020

University of Alberta

6. Schramm, Alexander E. Effects of Negative Valve Overlap on HCCI Combustion and its use in the Control of HCCI Combustion Timing.

Degree: MS, Department of Mechanical Engineering, 2014, University of Alberta

URL: https://era.library.ualberta.ca/files/x920fx024

► Homogeneous charge compression ignition (HCCI) combustion can produce higher efficiencies and lower emissions when compared to tradition spark or compression ignition engines. This study reports… (more)

Subjects/Keywords: Valve Timing; Homogeneous Charge Compression Ignition; NVO; Control; Negative Valve Overlap; HCCI

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

APA (6^th Edition):

Schramm, A. E. (2014). Effects of Negative Valve Overlap on HCCI Combustion and its use in the Control of HCCI Combustion Timing. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/x920fx024

Chicago Manual of Style (16^th Edition):

Schramm, Alexander E. “Effects of Negative Valve Overlap on HCCI Combustion and its use in the Control of HCCI Combustion Timing.” 2014. Masters Thesis, University of Alberta. Accessed February 28, 2021. https://era.library.ualberta.ca/files/x920fx024.

MLA Handbook (7^th Edition):

Schramm, Alexander E. “Effects of Negative Valve Overlap on HCCI Combustion and its use in the Control of HCCI Combustion Timing.” 2014. Web. 28 Feb 2021.

Vancouver:

Schramm AE. Effects of Negative Valve Overlap on HCCI Combustion and its use in the Control of HCCI Combustion Timing. [Internet] [Masters thesis]. University of Alberta; 2014. [cited 2021 Feb 28]. Available from: https://era.library.ualberta.ca/files/x920fx024.

Council of Science Editors:

Schramm AE. Effects of Negative Valve Overlap on HCCI Combustion and its use in the Control of HCCI Combustion Timing. [Masters Thesis]. University of Alberta; 2014. Available from: https://era.library.ualberta.ca/files/x920fx024

University of Michigan

7. Hamosfakidis, Vasileios. A two conserved scalar model for HCCI and PPCI engine applications.

Degree: PhD, Mechanical engineering, 2007, University of Michigan

URL: http://hdl.handle.net/2027.42/126432

► There is a strong demand for a versatile computational model in the design of modern engines such as homogeneous charge compression ignition (HCCI) and partially… (more)

▼ There is a strong demand for a versatile computational model in the design of modern engines such as homogeneous charge compression ignition (HCCI) and partially premixed compression ignition (PPCI) engines. A robust model is required to describe accurately both the chemistry and turbulent mixing processes in the reacting flow. Although the existing computational fluid dynamics (CFD) codes coupled with detailed kinetics models may reproduce some realistic results, the excessive computational cost prevents them to be applicable as engineering tools. The present study aims at developing a new modeling approach that can describe the combustion process with high fidelity and computational efficiency. In this study, a two-conserved scalar approach is proposed to model HCCI and PPCI combustion. The first conserved scalar, the mixture fraction Z, is introduced to capture the inhomogeneities in the fuel-air mixture, and the second conserved scalar, the initial EGR fraction J, is introduced to capture the inhomogeneities in the fresh mixture-EGR charge. The main benefits of this approach are the reduction of dimensionality and the compactness of the domain in the conserved scalar plane, and the capability to use different resolutions for the chemistry and the fluid mechanics calculation. To solve the flow in the conserved scalar plane, two algorithms are proposed. First, the flamelet (zone) creation strategy is introduced to discretize the conserved scalar space based on its mass distribution and reactivity. The second part is the regeneration procedure which accounts for the nonlinear effect of EGR on reaction rates. Test results from the two-conserved scalar approach are compared to those obtained by direct calculation, and it is demonstrated that the regeneration process in the present approach can properly account for the nonlinear effects arising from chemical reactions, as an improvement over the representative interactive flamelet (RIF) approach. The two conserved scalar model is subsequently implemented into the KIVA-3v code to simulate HCCI combustion. The results show excellent agreement with experimental data, demonstrating that the present approach achieves the initial modeling objectives. Finally, the two conserved scalar approach is applied to the modeling of direct injection (DI) combustion with an assumption of non-homogeneous EGR. Discrepancies relative to the results from direct calculations are identified. These are attributed to the limitation inherent to the flamelet model, and further improvements are suggested as future work. Advisors/Committee Members: Assanis, Dionissios N. (advisor).

Subjects/Keywords: Applications; Conserved; Engine; Hcci; Homogeneous Charge Compression Ignition; Homogeneous Charge-compression Ignition; Model; Partially Premixed Compression Ignition; Ppci; Scalar; Two

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

APA (6^th Edition):

Hamosfakidis, V. (2007). A two conserved scalar model for HCCI and PPCI engine applications. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/126432

Chicago Manual of Style (16^th Edition):

Hamosfakidis, Vasileios. “A two conserved scalar model for HCCI and PPCI engine applications.” 2007. Doctoral Dissertation, University of Michigan. Accessed February 28, 2021. http://hdl.handle.net/2027.42/126432.

MLA Handbook (7^th Edition):

Hamosfakidis, Vasileios. “A two conserved scalar model for HCCI and PPCI engine applications.” 2007. Web. 28 Feb 2021.

Vancouver:

Hamosfakidis V. A two conserved scalar model for HCCI and PPCI engine applications. [Internet] [Doctoral dissertation]. University of Michigan; 2007. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/2027.42/126432.

Council of Science Editors:

Hamosfakidis V. A two conserved scalar model for HCCI and PPCI engine applications. [Doctoral Dissertation]. University of Michigan; 2007. Available from: http://hdl.handle.net/2027.42/126432

8. Ben Houidi, Moez. Etude de l'influence des caractéristiques de carburants de synthèse sur la combustion diesel avancée homogène et partiellement homogène : Study of the impact of properties of synthetic fuels on diesel combustion.

Degree: Docteur es, Energétique, thermique, combustion, 2014, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique

URL: http://www.theses.fr/2014ESMA0013

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Dans un contexte de recherche de nouveaux modes de combustion propres, la combustionhomogène à allumage par compression HCCI s’inscrit comme une stratégie prometteuse.Cependant, cette combustion… (more)

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Dans un contexte de recherche de nouveaux modes de combustion propres, la combustionhomogène à allumage par compression HCCI s’inscrit comme une stratégie prometteuse.Cependant, cette combustion est limitée par un niveau élevé de bruit. La recherche descarburants permettant de relaxer cette contrainte constitue l’objectif global de cette étude.Particulièrement, on s’intéresse ici à l’influence de l’Indice de Cétane, de la volatilité et de lacomposition chimique des carburants sur les Délais d’Auto-Inflammation et sur les vitesses decombustion globales évaluées par les taux maximaux d’accroissement de la pression et dudégagement d’énergie apparente. L’étude se base dans un premier temps sur l’analyse d’essaissur banc moteur dans lesquels on a testé plusieurs carburants de synthèse à l’état pur et enmélange avec un Gazole conventionnel. Dans un deuxième temps des essais ont été préparés etréalisés sur Machine à Compression Rapide avec deux configurations en injection directe et enmélange homogène. Les essais Moteur ont permis d’orienter les paramètres expérimentauxciblés sur ce dispositif. D’autre part, pour étudier les régimes de combustion, des mesures dechamps de température locale ont été réalisées en mélange inerte (N2, CO2, Ar) par FluorescenceInduite par Laser avec un traceur Toluène. L’étude montre les limites des paramètres habituelspour caractériser l’adéquation carburant combustion HCCI et propose un nouveau critère basésur la dépendance des délais d’auto-inflammation à la température et à la richesse.

Advanced combustion strategies such as Homogeneous Charge Compression Ignition (HCCI)usually enable cleaner combustion with less NOx and Particulate Matter emissions comparedto conventional Diesel combustion. However, these strategies are difficult to implement due todifficulties related to combustion timing and burn rate control. Lately various studies have beenfocusing on extending advanced combustion functioning with new technologies and withsearching fuels properties to enable such combustion modes. This study is focused on theimpact of fuel Cetane Number, volatility and chemical composition on Ignition Delay, HeatRelease Rate and Pressure Rise Rate. The study is based on three complementary experiments.First, several synthetic fuel was tested on a research engine and analysis was focused on theHeat Release Rate. Secondly, experiments on a Rapid Compression Machine were performedto study the auto-ignition phenomena at homogeneous conditions with surrogate fuels (blendsof n-Heptane and Methyl-Cyclohexane). Analysis of the combustion regimes was supported bya study of the temperature field based on a Toluene Laser Induced Fluorescence experiment ininert (N2, CO2, Ar) mixture. Finally, the RCM was adapted to allow direct injection of fuel tostudy the auto-ignition at less homogeneous conditions. Results showed the limits of theconventional fuels properties to describe an adequate fuel formulation for the HCCI combustionmode. A new criterion based on the dependency of ignition delays to temperature and air…

Advisors/Committee Members: Bellenoue, Marc (thesis director), Sotton, Julien (thesis director).

Subjects/Keywords: Machine à compression rapide; Régime de combustion; Combustion homogène a allumage par compression; Indice de cétane; Rapid Compression Machine; Combustion regime; Homogeneous Charge Compression Ignition; Cetane number

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APA (6^th Edition):

Ben Houidi, M. (2014). Etude de l'influence des caractéristiques de carburants de synthèse sur la combustion diesel avancée homogène et partiellement homogène : Study of the impact of properties of synthetic fuels on diesel combustion. (Doctoral Dissertation). Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique. Retrieved from http://www.theses.fr/2014ESMA0013

Chicago Manual of Style (16^th Edition):

Ben Houidi, Moez. “Etude de l'influence des caractéristiques de carburants de synthèse sur la combustion diesel avancée homogène et partiellement homogène : Study of the impact of properties of synthetic fuels on diesel combustion.” 2014. Doctoral Dissertation, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique. Accessed February 28, 2021. http://www.theses.fr/2014ESMA0013.

MLA Handbook (7^th Edition):

Ben Houidi, Moez. “Etude de l'influence des caractéristiques de carburants de synthèse sur la combustion diesel avancée homogène et partiellement homogène : Study of the impact of properties of synthetic fuels on diesel combustion.” 2014. Web. 28 Feb 2021.

Vancouver:

Ben Houidi M. Etude de l'influence des caractéristiques de carburants de synthèse sur la combustion diesel avancée homogène et partiellement homogène : Study of the impact of properties of synthetic fuels on diesel combustion. [Internet] [Doctoral dissertation]. Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; 2014. [cited 2021 Feb 28]. Available from: http://www.theses.fr/2014ESMA0013.

Council of Science Editors:

Ben Houidi M. Etude de l'influence des caractéristiques de carburants de synthèse sur la combustion diesel avancée homogène et partiellement homogène : Study of the impact of properties of synthetic fuels on diesel combustion. [Doctoral Dissertation]. Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; 2014. Available from: http://www.theses.fr/2014ESMA0013

Anna University

9. Bhaskar K. Experimental investigation on a Direct injection diesel engine with Partially premixed inducted charge Of diesel and injected esters of Jatropha and fish oil;.

Degree: Experimental investigation on a Direct injection diesel engine with Partially premixed inducted charge Of diesel and injected esters of Jatropha and fish oil, 2015, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/38895

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More stringent emission standards are being introduced all over the newlineworld with the aim of progressively reducing vehicular emission leading newlineresearch to alternative combustion technologies… (more)

Subjects/Keywords: Carbonmonoxide; Direct Injection; Exhaust Gas Recirculation; Homogeneous charge compression ignition; Jatropha oil methyl ester; Unburnt Hydrocarbons

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APA (6^th Edition):

K, B. (2015). Experimental investigation on a Direct injection diesel engine with Partially premixed inducted charge Of diesel and injected esters of Jatropha and fish oil;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/38895

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):

K, Bhaskar. “Experimental investigation on a Direct injection diesel engine with Partially premixed inducted charge Of diesel and injected esters of Jatropha and fish oil;.” 2015. Thesis, Anna University. Accessed February 28, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/38895.

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

MLA Handbook (7^th Edition):

K, Bhaskar. “Experimental investigation on a Direct injection diesel engine with Partially premixed inducted charge Of diesel and injected esters of Jatropha and fish oil;.” 2015. Web. 28 Feb 2021.

Vancouver:

K B. Experimental investigation on a Direct injection diesel engine with Partially premixed inducted charge Of diesel and injected esters of Jatropha and fish oil;. [Internet] [Thesis]. Anna University; 2015. [cited 2021 Feb 28]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/38895.

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

Council of Science Editors:

K B. Experimental investigation on a Direct injection diesel engine with Partially premixed inducted charge Of diesel and injected esters of Jatropha and fish oil;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/38895

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

Missouri University of Science and Technology

10. Massey, Jeffery A. Development of a simple vibration model for predicting the structural dynamics of an HCCI engine.

Degree: PhD, Mechanical Engineering, Missouri University of Science and Technology

URL: https://scholarsmine.mst.edu/doctoral_dissertations/20

► "The hypothesis tested in this work is that the surface vibration and radiated sound of an engine operating under HCCI combustion is dominated by… (more)

▼ "The hypothesis tested in this work is that the surface vibration and radiated sound of an engine operating under HCCI combustion is dominated by the free vibration response of the engine's structural components to an impulsive loading brought about by the rapid energy release of the HCCI combustion process. Recent work by the author has shown that classical vibration theory describing the dynamic response of a single-degree-of-freedom (SDOF) oscillator may capture the major characteristics of the engine surface vibrations. Through an experimental investigation of HCCI combustion engine dynamics this model has been developed further. A band level analysis of measured engine noise was employed to determine whether low or high frequency oscillations were dominating the acoustic signature of the engine. The results of the band level analysis showed that the combustion behavior associated with the energy release process occurring in the bulk gas dominates the radiated engine noise when compared to the high frequency gas resonant oscillations. Using an impact hammer technique it was found that the vibration frequencies of oscillation measured on the engine surface do not govern the oscillation frequencies measured during combustion. However it was also found that the oscillation frequencies excited during combustion for all vertical velocity measurement locations were relatively constant regardless of engine firing condition. This result indicates that the frequencies are still governed by constant dynamic properties of the engine however this work has shown they are not local surface vibration modes. An in-depth analysis of the relation between the cylinder pressure power spectral density (PSD) and measured velocity PSD for various velocity measurement locations was undertaken. It was found the form of the cylinder pressure spectral energy directly modulated the surface velocity spectral energy indicative of a shock loading to the system. It was also found that peak HRR is a good indicator of combustion noise level in an HCCI engine. An analytical model based on the SDOF theory was developed to predict relative levels of HCCI combustion induced vibration metrics. This model provides the crucial link between the engine combustion and dynamic properties necessary for modeling of HCCI engine combustion noise" – Abstract, page iii.

Subjects/Keywords: Homogeneous charge compression ignition (HCCI); Mechanical Engineering

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APA (6^th Edition):

Massey, J. A. (n.d.). Development of a simple vibration model for predicting the structural dynamics of an HCCI engine. (Doctoral Dissertation). Missouri University of Science and Technology. Retrieved from https://scholarsmine.mst.edu/doctoral_dissertations/20

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Chicago Manual of Style (16^th Edition):

Massey, Jeffery A. “Development of a simple vibration model for predicting the structural dynamics of an HCCI engine.” Doctoral Dissertation, Missouri University of Science and Technology. Accessed February 28, 2021. https://scholarsmine.mst.edu/doctoral_dissertations/20.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

MLA Handbook (7^th Edition):

Massey, Jeffery A. “Development of a simple vibration model for predicting the structural dynamics of an HCCI engine.” Web. 28 Feb 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Massey JA. Development of a simple vibration model for predicting the structural dynamics of an HCCI engine. [Internet] [Doctoral dissertation]. Missouri University of Science and Technology; [cited 2021 Feb 28]. Available from: https://scholarsmine.mst.edu/doctoral_dissertations/20.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Council of Science Editors:

Massey JA. Development of a simple vibration model for predicting the structural dynamics of an HCCI engine. [Doctoral Dissertation]. Missouri University of Science and Technology; Available from: https://scholarsmine.mst.edu/doctoral_dissertations/20

Note: this citation may be lacking information needed for this citation format:
No year of publication.

University of Windsor

11. Jonnalagedda, Srikanth. Turbulent Flow and Combustion in Homogeneous Charge Compression Ignition Engines with Detailed Chemical Kinetics.

Degree: PhD, Mechanical, Automotive, and Materials Engineering, 2010, University of Windsor

URL: https://scholar.uwindsor.ca/etd/8010

► Homogeneous Charge Compression Ignition (HCCI) engines have the potential to achieve higher thermal efficiency and lower emissions compared with conventional Internal Combustion (IC) engines.… (more)

Subjects/Keywords: Applied sciences; Combustion; Homogeneous charge compression ignition; Turbulent flows

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APA (6^th Edition):

Jonnalagedda, S. (2010). Turbulent Flow and Combustion in Homogeneous Charge Compression Ignition Engines with Detailed Chemical Kinetics. (Doctoral Dissertation). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/8010

Chicago Manual of Style (16^th Edition):

Jonnalagedda, Srikanth. “Turbulent Flow and Combustion in Homogeneous Charge Compression Ignition Engines with Detailed Chemical Kinetics.” 2010. Doctoral Dissertation, University of Windsor. Accessed February 28, 2021. https://scholar.uwindsor.ca/etd/8010.

MLA Handbook (7^th Edition):

Jonnalagedda, Srikanth. “Turbulent Flow and Combustion in Homogeneous Charge Compression Ignition Engines with Detailed Chemical Kinetics.” 2010. Web. 28 Feb 2021.

Vancouver:

Jonnalagedda S. Turbulent Flow and Combustion in Homogeneous Charge Compression Ignition Engines with Detailed Chemical Kinetics. [Internet] [Doctoral dissertation]. University of Windsor; 2010. [cited 2021 Feb 28]. Available from: https://scholar.uwindsor.ca/etd/8010.

Council of Science Editors:

Jonnalagedda S. Turbulent Flow and Combustion in Homogeneous Charge Compression Ignition Engines with Detailed Chemical Kinetics. [Doctoral Dissertation]. University of Windsor; 2010. Available from: https://scholar.uwindsor.ca/etd/8010

12. Broekaert, Stijn. A study of the heat transfer in low temperature combustion engines.

Degree: 2018, Ghent University

URL: http://hdl.handle.net/1854/LU-8547486

► In this work, an experimental study was performed of the heat transfer in low temperature combustion engines. The heat transfer was measured in two single-cylinder… (more)

Subjects/Keywords: Technology and Engineering; Heat transfer; Low temperature combustion; Homogeneous charge compression ignition; Partially Premixed Combustion; Internal combustion engine; Experimental

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APA (6^th Edition):

Broekaert, S. (2018). A study of the heat transfer in low temperature combustion engines. (Thesis). Ghent University. Retrieved from http://hdl.handle.net/1854/LU-8547486

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):

Broekaert, Stijn. “A study of the heat transfer in low temperature combustion engines.” 2018. Thesis, Ghent University. Accessed February 28, 2021. http://hdl.handle.net/1854/LU-8547486.

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

MLA Handbook (7^th Edition):

Broekaert, Stijn. “A study of the heat transfer in low temperature combustion engines.” 2018. Web. 28 Feb 2021.

Vancouver:

Broekaert S. A study of the heat transfer in low temperature combustion engines. [Internet] [Thesis]. Ghent University; 2018. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/1854/LU-8547486.

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

Council of Science Editors:

Broekaert S. A study of the heat transfer in low temperature combustion engines. [Thesis]. Ghent University; 2018. Available from: http://hdl.handle.net/1854/LU-8547486

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

University of Michigan

13. Chiang, Chia-Jui. Modeling and control of homogeneous charge compression ignition engines with high dilution.

Degree: PhD, Mechanical engineering, 2007, University of Michigan

URL: http://hdl.handle.net/2027.42/126384

► Homogeneous charge compression ignition (HCCI) engines provide the benefits such as low NOx emission and high fuel efficiency. Control of the HCCI engine, however, is… (more)

▼ Homogeneous charge compression ignition (HCCI) engines provide the benefits such as low NOx emission and high fuel efficiency. Control of the HCCI engine, however, is difficult since its ignition cannot be directly actuated. Controlled autoignition requires regulation of the charge properties, especially charge temperature, as observed by many experimental results and substantiated in this thesis. To facilitate the control analysis and development, this thesis first introduce a physics-based cycle-to-cycle model of' a gasoline HCCI engine with an internal feedback loop constituted by the recirculation of exhaust gas. One important assumption in our modeling work that propagates down to the multiplicity analysis and controller synthesis is that the charge composition does not affect combustion (autoignition timing, burn duration, combustion efficiency, etc). This assumption is validated by the dominance of thermal dynamics revealed by sensitivity analysis and balanced realization of plant linearizations. Good agreement with experimental data suggests that the charge composition effects probably are of secondary importance, at least, for the regulation of the crank angle of 50% fuel burned (theta_C_A50). Based on the balanced truncation of the linearized model, a decentralized feedback and cancellation feedforward controller is designed. This linear controller has minimal complexity and care be tuned using classical PID design rules or real-time identification. The impact of the: nonlinear temperature dynamics in the internal feedback loop is then investigated by using the returning maps. The returning maps reveal the existence of stable and unstable equilibria of the cycle-to-cycle thermal dynamics. In the end, a nonlinear observer-based feedback controller is developed to stabilize the cycle-to-cycle temperature dynamics and regulate the combustion timing during large load transitions within the HCCI operating range. Simulations and estimates of the region of attraction show that the designed controller is robust to uncertainties such as the manifold filling dynamics, exhaust runner heat transfer, the cycle-to-cycle variation of theta_C_A50 and the uncertainty in the nonlinearity of the temperature dynamics. Advisors/Committee Members: Stefanopoulou, Anna G. (advisor).

Subjects/Keywords: Dilution; Engines; High; Homogeneous Charge Compression Ignition; Homogeneous Charge-compression Ignition; Linear Control; Modeling

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

APA (6^th Edition):

Chiang, C. (2007). Modeling and control of homogeneous charge compression ignition engines with high dilution. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/126384

Chicago Manual of Style (16^th Edition):

Chiang, Chia-Jui. “Modeling and control of homogeneous charge compression ignition engines with high dilution.” 2007. Doctoral Dissertation, University of Michigan. Accessed February 28, 2021. http://hdl.handle.net/2027.42/126384.

MLA Handbook (7^th Edition):

Chiang, Chia-Jui. “Modeling and control of homogeneous charge compression ignition engines with high dilution.” 2007. Web. 28 Feb 2021.

Vancouver:

Chiang C. Modeling and control of homogeneous charge compression ignition engines with high dilution. [Internet] [Doctoral dissertation]. University of Michigan; 2007. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/2027.42/126384.

Council of Science Editors:

Chiang C. Modeling and control of homogeneous charge compression ignition engines with high dilution. [Doctoral Dissertation]. University of Michigan; 2007. Available from: http://hdl.handle.net/2027.42/126384

University of Michigan

14. Chang, Kyoungjoon. Modeling and analysis of an HCCI engine during thermal transients using a thermodynamic cycle simulation with a coupled wall thermal network.

Degree: PhD, Mechanical engineering, 2007, University of Michigan

URL: http://hdl.handle.net/2027.42/126379

► This computational study addresses the unique characteristics of the strong coupling that exists between the thermal condition of the engine structure and the combustion in… (more)

▼ This computational study addresses the unique characteristics of the strong coupling that exists between the thermal condition of the engine structure and the combustion in a Homogeneous Charge Compression Ignition (HCCI) engine, with particular emphasis on the effects of thermal inertia and possible control strategies to compensate for the thermal non-equilibrium that occurs. The engine modeled is a single-cylinder HCCI engine with a re-breathing exhaust valve configuration that utilizes a large amount of hot residual to increase thermal energy of the air-fuel mixture for auto-ignition and to dilute it for preventing rapid heat release rate as well as to keep burned gas temperature low for NO_x control. The in-cylinder combustion and heat transfer, the gas exchange process through valves, and thermal inertia of the engine structures are considered simultaneously in order to fully investigate the HCCI engine transient behavior. A system level engine model including original combustion and heat transfer models developed for the HCCI engine was developed for this purpose. The original contribution of this study is the addition of a thermal network model that tracks the behavior of the engine's thermal boundaries during transient operation. The combustion and performance of an HCCI engine were found to be very sensitive to the engine thermal conditions including intake air temperature, residual level and coolant temperature. In particular, the transient wall temperature excursions from steady-state values were shown to play a great role in determining the combustion characteristics by reducing or enhancing the wall heat transfer. A stable steady-state HCCI operating range was defined and optimized for the best fuel economy by controlling the residual level, and possible shifts of the operating limits due to thermal transitions were studied. An original method was proposed to modulate the role of thermal inertia on auto-ignition during transients by compensating for thermally non-equilibrium wall conditions to enhance robust control of ignition timing in transient operation. A variable valve system was used for that purpose to control combustion phasing by optimizing residual level. The results were improved fuel economy while complying with knock and misfire limits. Advisors/Committee Members: Assanis, Dionissios N. (advisor).

Subjects/Keywords: Analysis; Coupled; Engine; Hcci; Homogeneous Charge Compression Ignition; Homogeneous Charge-compression Ignition; Modeling; Network; Simulation; Thermal Transients; Thermodynamic Cycle; Using; Wall

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

APA (6^th Edition):

Chang, K. (2007). Modeling and analysis of an HCCI engine during thermal transients using a thermodynamic cycle simulation with a coupled wall thermal network. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/126379

Chicago Manual of Style (16^th Edition):

Chang, Kyoungjoon. “Modeling and analysis of an HCCI engine during thermal transients using a thermodynamic cycle simulation with a coupled wall thermal network.” 2007. Doctoral Dissertation, University of Michigan. Accessed February 28, 2021. http://hdl.handle.net/2027.42/126379.

MLA Handbook (7^th Edition):

Chang, Kyoungjoon. “Modeling and analysis of an HCCI engine during thermal transients using a thermodynamic cycle simulation with a coupled wall thermal network.” 2007. Web. 28 Feb 2021.

Vancouver:

Chang K. Modeling and analysis of an HCCI engine during thermal transients using a thermodynamic cycle simulation with a coupled wall thermal network. [Internet] [Doctoral dissertation]. University of Michigan; 2007. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/2027.42/126379.

Council of Science Editors:

Chang K. Modeling and analysis of an HCCI engine during thermal transients using a thermodynamic cycle simulation with a coupled wall thermal network. [Doctoral Dissertation]. University of Michigan; 2007. Available from: http://hdl.handle.net/2027.42/126379

Loughborough University

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

Degree: PhD, 2016, Loughborough University

URL: http://hdl.handle.net/2134/21548

► 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 February 28, 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. 28 Feb 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 Feb 28]. 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

University of Michigan

16. Natarajan, Vinod Kumar. Spark -assisted compression ignition: An experimental investigation into how spark ignition advances combustion phasing in gasoline HCCI engines.

Degree: PhD, Mechanical engineering, 2006, University of Michigan

URL: http://hdl.handle.net/2027.42/126242

► Implementation of homogeneous charge compression ignition (HCCI) combustion in gasoline engines, while operating with improved fuel economy and reduced NOx emissions, is limited by the… (more)

▼ Implementation of homogeneous charge compression ignition (HCCI) combustion in gasoline engines, while operating with improved fuel economy and reduced NOx emissions, is limited by the inability to control combustion phasing. Spark-assisted compression ignition (SACI) is a mechanism that controls HCCI combustion phasing, using spark ignition to advance the onset of compression ignition (CI). SACI was employed at two light-load operating points (200 kPa and 300 kPa IMEP at fueling rates of 7 and 10 mg per cycle, respectively) to advance the phasing of a marginally-stable HCCI operating point. At the lower load, stratification by means of direct injection of 3 mg fuel at the time of spark ignition was required to advance phasing using SACI. At the higher load, robust SACI operation required less stratification (late injection of 1 mg). NOx emissions increased two- and four-fold in SACI relative to HCCI operation at the lower and higher load, respectively; this increase was shown to result primarily from the stratification. This study identified two issues confounding SACI, only observed at the lower load: cyclic variability in CI combustion phasing and inability to sufficiently advance phasing. To address these issues, new metrics were created in this study to identify four stages of the SACI combustion process: spark discharge, early kernel growth (EKG), flame propagation, and CI. Experiments were performed using an optical HCCI engine to simultaneously acquire steady-state emissions, in-cylinder pressure data, spark-discharge current and voltage waveforms, images of the plasma channel, and images of combustion chemiluminescence from two orthogonal views at sub-crank-angle resolution; these measurements were used to identify the four stages for each engine cycle and thereby the cyclic variability of each stage. It was concluded that cyclic variability in the EKG, the period of low flame growth-rate and weak chemiluminescence, was the dominant cause of cyclic variability in combustion phasing. Also, findings indicated only a weak correlation between the creation of large kernels and motion of the plasma channel away from the spark gap. At the higher load, robust flame propagation immediately followed the spark discharge. It was inferred that local fuel/air distribution affected the transition to flame propagation. Advisors/Committee Members: Sick, Volker (advisor).

Subjects/Keywords: Advances; Combustion; Engines; Experimental; Gasoline; Hcci; Homogeneous Charge Compression Ignition; How; Investigation; Phasing; Spark Ignition; Spark-assisted Compression Ignition; Spark-ignition

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APA (6^th Edition):

Natarajan, V. K. (2006). Spark -assisted compression ignition: An experimental investigation into how spark ignition advances combustion phasing in gasoline HCCI engines. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/126242

Chicago Manual of Style (16^th Edition):

Natarajan, Vinod Kumar. “Spark -assisted compression ignition: An experimental investigation into how spark ignition advances combustion phasing in gasoline HCCI engines.” 2006. Doctoral Dissertation, University of Michigan. Accessed February 28, 2021. http://hdl.handle.net/2027.42/126242.

MLA Handbook (7^th Edition):

Natarajan, Vinod Kumar. “Spark -assisted compression ignition: An experimental investigation into how spark ignition advances combustion phasing in gasoline HCCI engines.” 2006. Web. 28 Feb 2021.

Vancouver:

Natarajan VK. Spark -assisted compression ignition: An experimental investigation into how spark ignition advances combustion phasing in gasoline HCCI engines. [Internet] [Doctoral dissertation]. University of Michigan; 2006. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/2027.42/126242.

Council of Science Editors:

Natarajan VK. Spark -assisted compression ignition: An experimental investigation into how spark ignition advances combustion phasing in gasoline HCCI engines. [Doctoral Dissertation]. University of Michigan; 2006. Available from: http://hdl.handle.net/2027.42/126242

University of Michigan

17. Ortiz-Soto, Elliott Alexander. Combustion Modeling of Spark Assisted Compression Ignition for Experimental Analysis and Engine System Simulations.

Degree: PhD, Mechanical Engineering, 2013, University of Michigan

URL: http://hdl.handle.net/2027.42/102314

► Advanced combustion strategies provide significant efficiency and emissions benefits compared to conventional spark ignited (SI) combustion, but challenges related to combustion control and load limits… (more)

▼ Advanced combustion strategies provide significant efficiency and emissions benefits compared to conventional spark ignited (SI) combustion, but challenges related to combustion control and load limits have made these technologies difficult to implement in practical systems. Until now, low cost reduced order models necessary for large parametric and multi-cycle studies capable of accurately capturing the full range of combustion modes from homogeneous charge compression ignition (HCCI) and spark-assisted compression ignition (SACI) to SI have not been available. This important computational gap for advanced combustion engine research was the primary motivation for this doctoral work. The outcomes of this study include powerful new tools to evaluate advanced combustion strategies as well as novel methods to incorporate important advanced combustion characteristics into reduced order models. A reduced order thermodynamic model of advanced SACI combustion was first proposed. The model was used with available experimental data and previous high fidelity simulation results to develop a new empirical auto-ignition burn rate model that captures the effects of ignition timing, composition, temperature, pressure, engine speed, stratification and flame propagation. A complete engine model was then developed and incorporated into the commercial simulation software GT-Power. The model included chemical kinetics for low temperature heat release and auto-ignition detection and the empirical burn rate model for post-ignition heat release, as well as a new flame propagation model with improved physical groundings. The calibrated engine model showed good agreement with experimental trends of HCCI, SACI and SI combustion modes. The engine model was then used to assess practical strategies for accessing the advanced combustion regime and improving engine efficiency. The results showed HCCI and SACI provide a pathway for significant efficiency benefits compared to throttled SI, with efficiency improvements between 15-25% across a range of loads from 1-7 bar BMEP. Further efficiency gains appear possible beyond the experimentally observed SACI limit. As a further exercise, the load extension potential of boosted SACI combustion was conceptually investigated using a simple thermodynamic framework incorporating the empirical burn rate model and practical operating constraints. The results indicate boosted SACI can nearly double the maximum engine load compared to naturally aspirated operation. Advisors/Committee Members: Wooldridge, Margaret S. (committee member), Assanis, Dionissios N. (committee member), Fidkowski, Krzysztof J. (committee member), Martz, Jason Brian (committee member), Lavoie, George A. (committee member), Babajimopoulos, Aristotelis (committee member), Borgnakke, Claus (committee member).

Subjects/Keywords: Spark Assisted Compression Ignition, Saci; Homogeneous Charge Compression Ignition, Hcci, Spark Ignition, Si, Knock; Advanced Combustion Engines; Combustion Modeling; Engine Simulation; Efficiency, Fuel Economy, Load Extension, Load Expansion; Mechanical Engineering; Engineering

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

APA (6^th Edition):

Ortiz-Soto, E. A. (2013). Combustion Modeling of Spark Assisted Compression Ignition for Experimental Analysis and Engine System Simulations. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/102314

Chicago Manual of Style (16^th Edition):

Ortiz-Soto, Elliott Alexander. “Combustion Modeling of Spark Assisted Compression Ignition for Experimental Analysis and Engine System Simulations.” 2013. Doctoral Dissertation, University of Michigan. Accessed February 28, 2021. http://hdl.handle.net/2027.42/102314.

MLA Handbook (7^th Edition):

Ortiz-Soto, Elliott Alexander. “Combustion Modeling of Spark Assisted Compression Ignition for Experimental Analysis and Engine System Simulations.” 2013. Web. 28 Feb 2021.

Vancouver:

Ortiz-Soto EA. Combustion Modeling of Spark Assisted Compression Ignition for Experimental Analysis and Engine System Simulations. [Internet] [Doctoral dissertation]. University of Michigan; 2013. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/2027.42/102314.

Council of Science Editors:

Ortiz-Soto EA. Combustion Modeling of Spark Assisted Compression Ignition for Experimental Analysis and Engine System Simulations. [Doctoral Dissertation]. University of Michigan; 2013. Available from: http://hdl.handle.net/2027.42/102314

18. SZYMKOWICZ, PATRICK. ANALYTICAL AND EXPERIMENTAL INVESTIGATION OF MULTI-COMPONENT SURROGATE DIESEL FUELS .

Degree: 2017, Universitat Politècnica de València

URL: http://hdl.handle.net/10251/90406

► Diesel fuel is composed of a complex mixture of hundreds of hydrocarbons that vary globally depending on crude oil sources, refining processes, legislative requirements and… (more)

▼ Diesel fuel is composed of a complex mixture of hundreds of hydrocarbons that vary globally depending on crude oil sources, refining processes, legislative requirements and other factors. In order to simplify the study of this fuel, researchers create surrogate fuels with a much simpler composition, in an attempt to mimic and control the physical and chemical properties of Diesel fuel. The first surrogates were single-component fuels such as n-heptane and n-dodecane. Recent advancements have provided researchers the ability to develop multi-component surrogate fuels and apply them to both analytical and experimental studies. The systematic application of precisely controlled surrogate fuels promises to further enhance our understanding of Diesel combustion, efficiency, emissions and particulates and provide tools for investigating new and alternative engine combustion systems. This thesis employed analytical and experimental methods to develop, validate and study a library of multi-component surrogate Diesel fuels. The first step was to design a surrogate fuel to precisely match the physical and chemical properties of a full-range petroleum Diesel fuel with 50 cetane number and a typical threshold soot index value of 31. The next step was to create a Surrogate Fuel Library with 18 fuels that independently varied two key fuel properties: cetane number and threshold soot index. Within the fuel library cetane number ranged from 35 to 60 at three threshold soot index levels of 17, 31 and 48 (low, mid-range and high). Extensive ASTM fuel property tests showed that good agreement with important physical and chemical properties of petroleum Diesel fuel such as density, viscosity, heating value and distillation curve. An experimental investigation was conducted to evaluate the combustion, emissions, soot and exhaust particles from the petroleum Diesel fuel and the matching surrogate fuel. A fully-instrumented single-cylinder Diesel engine was operated with combustion strategies including Premixed Charge Compression Ignition (PCCI), Low-Temperature Combustion (LTC) and Conventional Diesel Combustion (CDC). For combustion, the ignition delay, low-temperature (first stage) and high temperature (second stage) heat-release matched very well. Gaseous emissions, soot and exhaust particles maintained good agreement as exhaust gas recirculation and combustion phasing were varied. This thesis demonstrated that fully representative Diesel surrogate fuels could be tailored with the proper blending of the following hydrocarbon components: n-hexadecane, 2,2,4,4,6,8,8-heptamethylnonane, decahydronaphthalene and 1-methylnaphthalene. It was also established that the volumetric blending fractions of these four components could be varied to independently control the fuel cetane number and threshold soot index while retaining the combustion, physical and chemical properties of full-range petroleum Diesel fuel. The Surrogate Fuel Library provided by this thesis supplies Diesel engine researchers and designers the ability to… Advisors/Committee Members: Benajes Calvo, Jesus Vicente (advisor).

Subjects/Keywords: Diesel Combustion; Gaseous Emissions; Exhaust Smoke; Diesel Exhaust Particles; Diesel Fuel; Multi-Component Surrogate Diesel Fuel; Low Temperature Combustion; Premixed Charge Compression Ignition; Diesel Fuel Properties; Cetane Number; Threshold Soot Index

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APA (6^th Edition):

SZYMKOWICZ, P. (2017). ANALYTICAL AND EXPERIMENTAL INVESTIGATION OF MULTI-COMPONENT SURROGATE DIESEL FUELS . (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/90406

Chicago Manual of Style (16^th Edition):

SZYMKOWICZ, PATRICK. “ANALYTICAL AND EXPERIMENTAL INVESTIGATION OF MULTI-COMPONENT SURROGATE DIESEL FUELS .” 2017. Doctoral Dissertation, Universitat Politècnica de València. Accessed February 28, 2021. http://hdl.handle.net/10251/90406.

MLA Handbook (7^th Edition):

SZYMKOWICZ, PATRICK. “ANALYTICAL AND EXPERIMENTAL INVESTIGATION OF MULTI-COMPONENT SURROGATE DIESEL FUELS .” 2017. Web. 28 Feb 2021.

Vancouver:

SZYMKOWICZ P. ANALYTICAL AND EXPERIMENTAL INVESTIGATION OF MULTI-COMPONENT SURROGATE DIESEL FUELS . [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2017. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/10251/90406.

Council of Science Editors:

SZYMKOWICZ P. ANALYTICAL AND EXPERIMENTAL INVESTIGATION OF MULTI-COMPONENT SURROGATE DIESEL FUELS . [Doctoral Dissertation]. Universitat Politècnica de València; 2017. Available from: http://hdl.handle.net/10251/90406

19. Sud, Keshav. Transient Modeling and Control of Split Cycle Clean Combustion Diesel Engine.

Degree: 2013, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/9944

► Split Cycle Clean Combustion (SCCC) concept is a combustion process that results in reduced gaseous and particulate emissions while maintaining high engine efficiency compared to… (more)

Subjects/Keywords: Homogeneous Charge Compression Ignition (HCCI); Diesel Engine; Clean Fuel; After treatment; Selective Catalytic Reduction (SCR); Diesel Particulate Filer (DPF); Model; Modeling; One Dimensional; 1-D

…Clean Combustion HCCI – homogeneous Charge Compression Ignition CI – Compression Ignition NOx… …of a partial premixed charge compression ignition (PCCI) diesel engine for… …Compression Ignition (HCCI) concept, there are currently no diesel fuel powered SCCC… …compression ignition diesel engine is that the exhaust valves are absent in adjacent cylinders… …sized compression ignition diesel engine. 2 In this process, a Caterpillar’s 4.4 liter…

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

APA (6^th Edition):

Sud, K. (2013). Transient Modeling and Control of Split Cycle Clean Combustion Diesel Engine. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/9944

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):

Sud, Keshav. “Transient Modeling and Control of Split Cycle Clean Combustion Diesel Engine.” 2013. Thesis, University of Illinois – Chicago. Accessed February 28, 2021. http://hdl.handle.net/10027/9944.

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

MLA Handbook (7^th Edition):

Sud, Keshav. “Transient Modeling and Control of Split Cycle Clean Combustion Diesel Engine.” 2013. Web. 28 Feb 2021.

Vancouver:

Sud K. Transient Modeling and Control of Split Cycle Clean Combustion Diesel Engine. [Internet] [Thesis]. University of Illinois – Chicago; 2013. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/10027/9944.

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

Council of Science Editors:

Sud K. Transient Modeling and Control of Split Cycle Clean Combustion Diesel Engine. [Thesis]. University of Illinois – Chicago; 2013. Available from: http://hdl.handle.net/10027/9944

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

University of Michigan

20. Keum, Seung Hwan. An Improved Representative Interactive Flamelet Model Accounting for Evaporation Effect in Reaction Space (RIF-ER).

Degree: PhD, Mechanical Engineering, 2009, University of Michigan

URL: http://hdl.handle.net/2027.42/62293

► Recently, applications of spray combustion in internal combustion engines (ICE) are being expanded from conventional to gasoline direct injection engines. Moreover, stratification using spray is… (more)

▼ Recently, applications of spray combustion in internal combustion engines (ICE) are being expanded from conventional to gasoline direct injection engines. Moreover, stratification using spray is further considered as a controlled autoignition (CAI) measure in Homogeneous Charge Compression Ignition (HCCI) engines. A well validated spray combustion model can provide a good modeling tool which can facilitate understanding of spray combustion physics. In this research, a spray combustion model is proposed to model low temperature combustion in internal combustion engines. The proposed model is based on the Representative Interactive Flamelet (RIF) model of Peters (2000). In addition to the original RIF model, the effect of spray and vaporization of droplets in the reaction space were considered to be included in the governing equations as source terms. The effect of such source terms were examined in the reaction space in idealized control volumes, where the effect of vaporization is assumed as gaseous fuel addition with known rate of addition. It was found that the effect of spray may not be negligible when fuel addition occurs over a reaction space with chemical reaction. The proposed model was validated by comparing pressure and fuel concentration against experimental data from the rapid compression machine experiment of Akiyama et al. (1998) and the diesel engine experiment of Hong et al. (2008). Predictions showed good agreement with the experimental observations. Comparison between numerical models, one with spray source terms and the other without them has been carried out to examine the effect of spray source terms on spatial fuel distributions and overall pressure histories. The proposed model has been implemented in KIVA3v. The proposed model is applied to investigate the effect of stratification under PPCI operating condition using direct injection. An experimental study on the effect of stratification on combustion and emission has been numerically reproduced. The numerical results showed good qualitative agreement with the measured engine performance and emission trend against the experimental data. Detailed analysis of the in–cylinder combustion is also provided. Advisors/Committee Members: Assanis, Dionissios N. (committee member), Im, Hong G. (committee member), Babajimopoulos, Aristotelis (committee member), Driscoll, James F. (committee member).

Subjects/Keywords: Internal Combustion Engine; Combustion Model; Homogeneous Charge Compression Ignition; Mechanical Engineering; Engineering

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APA (6^th Edition):

Keum, S. H. (2009). An Improved Representative Interactive Flamelet Model Accounting for Evaporation Effect in Reaction Space (RIF-ER). (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/62293

Chicago Manual of Style (16^th Edition):

Keum, Seung Hwan. “An Improved Representative Interactive Flamelet Model Accounting for Evaporation Effect in Reaction Space (RIF-ER).” 2009. Doctoral Dissertation, University of Michigan. Accessed February 28, 2021. http://hdl.handle.net/2027.42/62293.

MLA Handbook (7^th Edition):

Keum, Seung Hwan. “An Improved Representative Interactive Flamelet Model Accounting for Evaporation Effect in Reaction Space (RIF-ER).” 2009. Web. 28 Feb 2021.

Vancouver:

Keum SH. An Improved Representative Interactive Flamelet Model Accounting for Evaporation Effect in Reaction Space (RIF-ER). [Internet] [Doctoral dissertation]. University of Michigan; 2009. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/2027.42/62293.

Council of Science Editors:

Keum SH. An Improved Representative Interactive Flamelet Model Accounting for Evaporation Effect in Reaction Space (RIF-ER). [Doctoral Dissertation]. University of Michigan; 2009. Available from: http://hdl.handle.net/2027.42/62293

21. André, Mathieu. Potentiel de la combustion HCCI et injection précoce : Potential of HCCI combustion and early injection.

Degree: Docteur es, Mécanique et énergétique, 2010, Université d'Orléans

URL: http://www.theses.fr/2010ORLE2051

►

Depuis plusieurs années, l’une des problématiques sociétales est de diminuer les émissions de polluants et de gaz à effet de serre dans l’atmosphère. Le secteur… (more)

▼

Depuis plusieurs années, l’une des problématiques sociétales est de diminuer les émissions de polluants et de gaz à effet de serre dans l’atmosphère. Le secteur du transport terrestre est directement concerné par ces considérations. Le moteur Diesel semble promis à un bel avenir grâce à son rendement supérieur à celui du moteur à allumage commandé, conduisant à de plus faibles rejets de CO2. Cependant, sa combustion génère des émissions d’oxyde d’azote (NOx) et de particules dans l’atmosphère. Les normes anti-pollution étant de plus en plus sévères et les incitations à diminuer les consommations de carburant de plus en plus fortes, le moteur Diesel est confronté à une problématique NOx/particules/consommation toujours plus difficile à résoudre. Une des voies envisagées consiste à modifier le mode de combustion afin de limiter les émissions polluantes à la source tout en conservant de faibles consommations. La voie la plus prometteuse est la combustion HCCI (Homogeneous Charge Compression Ignition) obtenue par injections directes précoces. Plusieurs limitations critiques doivent cependant être revues et améliorées : le mouillage des parois par le carburant liquide et le contrôle de la combustion à forte charge. Le but de cette thèse est ainsi de mieux comprendre les phénomènes mis en jeu lors de la combustion HCCI à forte charge obtenue par des multi-injections directes précoces. Une méthodologie a été mise au point afin de détecter le mouillage des parois du cylindre, ce qui a permis de comprendre l’effet du phasage et de la pression d’injection sur cette problématique. Une stratégie optimale de multi-injections permettant d’atteindre une charge élevée sans mouiller les parois a ainsi été développée et choisie. Nous avons ensuite pu mettre en évidence le potentiel de la stratification par la dilution en tant que moyen de contrôle de la combustion en admettant le diluant dans un seul des 2 conduits d’admission. Des mesures réalisées en complémentarité sur le même moteur mais en version ‘optique’, ont permis, à partir de la technique de Fluorescence Induite par Laser, de montrer que concentrer le diluant dans les zones réactives où se situe le carburant permet un meilleur contrôle de la combustion, ce qui permet d’amener le taux de dilution a des niveaux faisables technologiquement.

For several years, reduce pollutant and greenhouse gas emissions in the atmosphere is become a leitmotiv. The automotive world is directly affected by these considerations. Diesel engine has a promising future thanks to its efficiency higher than that of S.I. engine, leading to lower CO2 emissions. However, Diesel combustion emits nitrogen oxides (NOx) and particulates in the atmosphere. Emissions regulations are more and more severe, and considerations about fuel consumption are more and more significant. Thus, Diesel engine has to face a NOx/particulates/consumption issue that is more and more difficult to answer. One of the considered ways to reduce pollutant emissions while maintaining low fuel consumptions is to change the…

Advisors/Committee Members: Mounaïm-Rousselle, Christine (thesis director), Bruneaux, Gilles (thesis director).

Subjects/Keywords: HCCI; Injection directe précoce; Mouillage des parois; Multi-injections; Contrôle de la combustion; Homogeneous charge compression ignition; Early direct injection; Wall wetting; Multiple injections; Control of combustion

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

APA (6^th Edition):

André, M. (2010). Potentiel de la combustion HCCI et injection précoce : Potential of HCCI combustion and early injection. (Doctoral Dissertation). Université d'Orléans. Retrieved from http://www.theses.fr/2010ORLE2051

Chicago Manual of Style (16^th Edition):

André, Mathieu. “Potentiel de la combustion HCCI et injection précoce : Potential of HCCI combustion and early injection.” 2010. Doctoral Dissertation, Université d'Orléans. Accessed February 28, 2021. http://www.theses.fr/2010ORLE2051.

MLA Handbook (7^th Edition):

André, Mathieu. “Potentiel de la combustion HCCI et injection précoce : Potential of HCCI combustion and early injection.” 2010. Web. 28 Feb 2021.

Vancouver:

André M. Potentiel de la combustion HCCI et injection précoce : Potential of HCCI combustion and early injection. [Internet] [Doctoral dissertation]. Université d'Orléans; 2010. [cited 2021 Feb 28]. Available from: http://www.theses.fr/2010ORLE2051.

Council of Science Editors:

André M. Potentiel de la combustion HCCI et injection précoce : Potential of HCCI combustion and early injection. [Doctoral Dissertation]. Université d'Orléans; 2010. Available from: http://www.theses.fr/2010ORLE2051

University of Windsor

22. Gnanam, Gnanaprakash. Homogeneous charge compression ignition (HCCI) engine fuelled with ethanol, iso -octane and products of in -cylinder reformation in an IDI-type engine.

Degree: PhD, Mechanical, Automotive, and Materials Engineering, 2008, University of Windsor

URL: https://scholar.uwindsor.ca/etd/8082

► The major focus of this research is to analyze the individual parameters, such as, fuel chemistry, EGR, intake air temperature and engine speed that… (more)

▼ The major focus of this research is to analyze the individual parameters, such as, fuel chemistry, EGR, intake air temperature and engine speed that affect the HCCI combustion on-set and to utilize in-cylinder reformation as means of controlling the HCCI combustion on-set. A new in-cylinder reformation system to control the on-set of combustion has been designed and fabricated with direct injection capabilities to examine the proposed in-cylinder reformation process. The proposed reformation strategy has the advantage of temporarily varying the compression ratio during the compression stroke and controlling the HCCI combustion on-set, in addition to the effects of fuel reformation products. The methodology adopted in this thesis to identify these parameters is mostly experimental. However, there is a smaller computational component which involves HCCI cycle calculations with fuel reformation using a single-zone model. The computational part is primarily used to analyze the advantages of a proposed in-cylinder reformation strategy on HCCI combustion before implementation in the experimental set-up. The experimental engine used for the study is a four-stroke, three cylinder In-Direct Injection (IDI) type compression ignition engine which was converted to single cylinder operation for HCCI combustion. The HCCI engine was fuelled with a lean mixture of air and fuel (ethanol, iso-octane, mixture of ethanol/iso-octane or ethanol with products of in-cylinder reformation). Based on cycle-resolved in-cylinder pressure measurements, the experimental results demonstrate that the addition of iso-octane to ethanol retards the onset of combustion and subsequently leads to a reduction of the IMEP and thermal efficiency. The addition of EGR retards the on-set of HCCI combustion and the study indicates that ethanol allows for the use of higher percentage of EGR when compared to iso-octane. The proposed in-cylinder reformation strategy is an effective method for controlling HCCI combustion on-set (SOC) and reduces the regulated engine-out emissions. The temporary change in compression ratio that results from utilizing the proposed pre-chamber methodology has a stronger influence in controlling the HCCI combustion on-set (SOC) compared to the effects of fuel reformation products alone. Advisors/Committee Members: Andrzej Sobiesiak.

Subjects/Keywords: Applied sciences; Ethanol; Homogeneous charge compression ignition; In-cylinder reformation; Iso-octane

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APA (6^th Edition):

Gnanam, G. (2008). Homogeneous charge compression ignition (HCCI) engine fuelled with ethanol, iso -octane and products of in -cylinder reformation in an IDI-type engine. (Doctoral Dissertation). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/8082

Chicago Manual of Style (16^th Edition):

Gnanam, Gnanaprakash. “Homogeneous charge compression ignition (HCCI) engine fuelled with ethanol, iso -octane and products of in -cylinder reformation in an IDI-type engine.” 2008. Doctoral Dissertation, University of Windsor. Accessed February 28, 2021. https://scholar.uwindsor.ca/etd/8082.

MLA Handbook (7^th Edition):

Gnanam, Gnanaprakash. “Homogeneous charge compression ignition (HCCI) engine fuelled with ethanol, iso -octane and products of in -cylinder reformation in an IDI-type engine.” 2008. Web. 28 Feb 2021.

Vancouver:

Gnanam G. Homogeneous charge compression ignition (HCCI) engine fuelled with ethanol, iso -octane and products of in -cylinder reformation in an IDI-type engine. [Internet] [Doctoral dissertation]. University of Windsor; 2008. [cited 2021 Feb 28]. Available from: https://scholar.uwindsor.ca/etd/8082.

Council of Science Editors:

Gnanam G. Homogeneous charge compression ignition (HCCI) engine fuelled with ethanol, iso -octane and products of in -cylinder reformation in an IDI-type engine. [Doctoral Dissertation]. University of Windsor; 2008. Available from: https://scholar.uwindsor.ca/etd/8082

Michigan Technological University

23. 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 February 28, 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. 28 Feb 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 Feb 28]. 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

Mississippi State University

24. Carpenter, Chad Duane. Strategies for optimization of diesel-ignited propane dual fuel combustion in a heavy duty compression ignition engine.

Degree: MS, Mechanical Engineering, 2013, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11012013-084624/ ;

► A 12.9 L heavy duty compression ignition engine was tested with strategies for dual fuel optimization. The effects of varied intake manifold pressure as… (more)

Subjects/Keywords: dual fuel; diesel ignited propane; compression ignition engine

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APA (6^th Edition):

Carpenter, C. D. (2013). Strategies for optimization of diesel-ignited propane dual fuel combustion in a heavy duty compression ignition engine. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-11012013-084624/ ;

Chicago Manual of Style (16^th Edition):

Carpenter, Chad Duane. “Strategies for optimization of diesel-ignited propane dual fuel combustion in a heavy duty compression ignition engine.” 2013. Masters Thesis, Mississippi State University. Accessed February 28, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11012013-084624/ ;.

MLA Handbook (7^th Edition):

Carpenter, Chad Duane. “Strategies for optimization of diesel-ignited propane dual fuel combustion in a heavy duty compression ignition engine.” 2013. Web. 28 Feb 2021.

Vancouver:

Carpenter CD. Strategies for optimization of diesel-ignited propane dual fuel combustion in a heavy duty compression ignition engine. [Internet] [Masters thesis]. Mississippi State University; 2013. [cited 2021 Feb 28]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11012013-084624/ ;.

Council of Science Editors:

Carpenter CD. Strategies for optimization of diesel-ignited propane dual fuel combustion in a heavy duty compression ignition engine. [Masters Thesis]. Mississippi State University; 2013. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11012013-084624/ ;

Queens University

25. Spaeth, Christopher Thomas. Performance Characteristics of a Diesel Fuel Piloted Syngas Compression Ignition Engine .

Degree: Mechanical and Materials Engineering, 2012, Queens University

URL: http://hdl.handle.net/1974/7221

► The performance characteristics of a diesel fuel piloted syngas compression ignition engine are presented in this thesis. A stock Hatz 1D81 engine was converted to… (more)

Subjects/Keywords: methane ; CI engine ; compression ignition engine ; diesel ; syngas

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APA (6^th Edition):

Spaeth, C. T. (2012). Performance Characteristics of a Diesel Fuel Piloted Syngas Compression Ignition Engine . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/7221

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):

Spaeth, Christopher Thomas. “Performance Characteristics of a Diesel Fuel Piloted Syngas Compression Ignition Engine .” 2012. Thesis, Queens University. Accessed February 28, 2021. http://hdl.handle.net/1974/7221.

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

MLA Handbook (7^th Edition):

Spaeth, Christopher Thomas. “Performance Characteristics of a Diesel Fuel Piloted Syngas Compression Ignition Engine .” 2012. Web. 28 Feb 2021.

Vancouver:

Spaeth CT. Performance Characteristics of a Diesel Fuel Piloted Syngas Compression Ignition Engine . [Internet] [Thesis]. Queens University; 2012. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/1974/7221.

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

Council of Science Editors:

Spaeth CT. Performance Characteristics of a Diesel Fuel Piloted Syngas Compression Ignition Engine . [Thesis]. Queens University; 2012. Available from: http://hdl.handle.net/1974/7221

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

Queens University

26. House, Andrew. Part Load Characterization of a Small-Bore Diesel Piloted Dual Fuel Compression Ignition Engine with Methane .

Degree: Mechanical and Materials Engineering, 2015, Queens University

URL: http://hdl.handle.net/1974/13604

► A 0.8L, 3 cylinder turbocharged diesel engine was retrofitted for premixed and port injected dual fuel operation. Diesel baseline testing was conducted and conventional diesel… (more)

▼ A 0.8L, 3 cylinder turbocharged diesel engine was retrofitted for premixed and port injected dual fuel operation. Diesel baseline testing was conducted and conventional diesel trends in efficiency and emissions were found in relation to pilot start of injection (SOI) and load. However, at low loads the combustion mode deviated from a conventional diffusion flame. The end of injection was found to occur well before start of combustion (SOC), suggesting that combustion was closer to premixed charge compression ignition (PCCI). Dual fuel mode operation was carried out using two methods. First, the fuel proportions were varied while maintaining 25% full load (FL). The brake fuel conversion efficiency (BCFE), unburned hydrocarbons (UHC) and CO emissions suffered, while NOx emissions and peak pressure decreased with increased methane substitution. Ignition delay increased with methane substitution. Port injected dual fuel modes yielded improved BFCE, but similar UHC and CO emissions compared to premixed dual fuel. Second, constant pilot tests with small pilot quantities resulted in decreased BFCE and increased CO and UHC emissions compared to diesel-only. Increasing load resulted in improved BFCE relative to diesel performance and decreased UHC and CO emissions. Constant pilot NOx emissions were lower than diesel-only at low load, but far exceeded diesel levels above 50%FL. Increased pilot injection quantity provided emissions and BFCE benefits compared to the minimum pilot quantity for low loads only (below 50%). Advancing SOI increased peak cylinder pressure and temperature, and improved UHC and CO emissions. Further advancement resulted in decreased BFCE due to very early heat release (BTDC). Similarly at 50%FL SOI advance increased peak pressure and temperature. Much less improvement in BFCE was found with SOI advancement, but UHC and CO emissions were reduced. At very early SOI angles SOC and peak pressure was retarded and yielded a slow ignition event followed by a single heat release event. Increasing the load and/or pilot quantity resulted in further advancement of SOI timing compared to the smaller pilot quantity. All tests reported in this thesis were conducted at an 1800RPM nominal engine speed.

Subjects/Keywords: Dual Fuel ; Methane ; Port Injection ; Diesel ; Diesel Pilot ; I.C. Engine ; Engine Testing ; Compression Ignition

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APA (6^th Edition):

House, A. (2015). Part Load Characterization of a Small-Bore Diesel Piloted Dual Fuel Compression Ignition Engine with Methane . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/13604

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):

House, Andrew. “Part Load Characterization of a Small-Bore Diesel Piloted Dual Fuel Compression Ignition Engine with Methane .” 2015. Thesis, Queens University. Accessed February 28, 2021. http://hdl.handle.net/1974/13604.

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

MLA Handbook (7^th Edition):

House, Andrew. “Part Load Characterization of a Small-Bore Diesel Piloted Dual Fuel Compression Ignition Engine with Methane .” 2015. Web. 28 Feb 2021.

Vancouver:

House A. Part Load Characterization of a Small-Bore Diesel Piloted Dual Fuel Compression Ignition Engine with Methane . [Internet] [Thesis]. Queens University; 2015. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/1974/13604.

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

Council of Science Editors:

House A. Part Load Characterization of a Small-Bore Diesel Piloted Dual Fuel Compression Ignition Engine with Methane . [Thesis]. Queens University; 2015. Available from: http://hdl.handle.net/1974/13604

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

University of New South Wales

27. Woo, Changhwan. Combustion strategies for the increased use of biofuels in a small-bore diesel engine.

Degree: Mechanical & Manufacturing Engineering, 2015, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/55382 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:37427/SOURCE02?view=true

► Biodiesel and ethanol are most widely considered as a promising alternative fuel to petroleum diesel and gasoline due to their renewable nature and potential reduction… (more)

▼ Biodiesel and ethanol are most widely considered as a promising alternative fuel to petroleum diesel and gasoline due to their renewable nature and potential reduction in greenhouse gas emissions. This thesis applies three different combustion strategies that can achieve the increased use of these biofuels without compromising engine efficiency and pollutant emissions, which includes 1) coconut oil-based biodiesel combustion with varying blending ratios of biodiesel and petroleum diesel, 2) dual-fuel combustion of port injected ethanol and direct injected biodiesel blend, and 3) neat ethanol combustion in a common-rail diesel engine. All of the three combustion strategies are realised in the same single-cylinder light-duty diesel engine. For the coconut-oil biodiesel combustion, a higher biodiesel blending ratio results in decreased indicated power but the improved lubricity of coconut-oil biodiesel and hence reduced friction loses leads to similar brake power of diesel. From the engine-out emissions, a significant reduction of smoke emissions are observed with an increase in the biodiesel blending ratio, which is explained by the oxygenated molecular structures and reduced aromatics contents of biodiesel. Also, the slower reaction and leaner mixture of high biodiesel blends, together with shorter carbon chain length of coconut-oil biodiesel, cause the reduced flame temperature and thereby decreasing NOx emissions. Nevertheless, a significant increase in the brake specific fuel consumption limits the highest biodiesel blending ratio at B40. The increased use of biofuel is achieved via an alternative approach using dual-fuelling of ethanol and B40. The results show that the indicated power increases with increasing ethanol energy fraction because the increased premixed charge leads to faster burning and thereby increasing the heat release rate. This effect, together with the reduced friction loss of coconut-oil biodiesel, results in higher brake power than diesel combustion while both smoke and NOx emissions are significantly reduced. The most promising results are found when neat ethanol is injected directly into the cylinder using a common-rail system, which achieve 100% biofuel usage. The optimised injection strategy using a split injection comprised of early bottom-dead-centre injection and near top-dead-centre injection achieves 50% higher fuel conversion efficiency despite 5% lower brake specific fuel consumption. The NOx emissions are reduced 30% while smoke emission is negligible. Advisors/Committee Members: Sanghoon, Kook, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW, Qing Nian (Shaun), Chan, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: Emissions; Gasoline compression ignition; Partially premixed combustion; Gasoline compression ignition; Biofuel; Diesel engine; Partially premixed combustion

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

APA (6^th Edition):

Woo, C. (2015). Combustion strategies for the increased use of biofuels in a small-bore diesel engine. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/55382 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:37427/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Woo, Changhwan. “Combustion strategies for the increased use of biofuels in a small-bore diesel engine.” 2015. Doctoral Dissertation, University of New South Wales. Accessed February 28, 2021. http://handle.unsw.edu.au/1959.4/55382 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:37427/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Woo, Changhwan. “Combustion strategies for the increased use of biofuels in a small-bore diesel engine.” 2015. Web. 28 Feb 2021.

Vancouver:

Woo C. Combustion strategies for the increased use of biofuels in a small-bore diesel engine. [Internet] [Doctoral dissertation]. University of New South Wales; 2015. [cited 2021 Feb 28]. Available from: http://handle.unsw.edu.au/1959.4/55382 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:37427/SOURCE02?view=true.

Council of Science Editors:

Woo C. Combustion strategies for the increased use of biofuels in a small-bore diesel engine. [Doctoral Dissertation]. University of New South Wales; 2015. Available from: http://handle.unsw.edu.au/1959.4/55382 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:37427/SOURCE02?view=true

University of Kansas

28. Srivatsa, Charu Vikram Chandrashekhar. Performance and Emissions Analysis of Pre-mixed and Partially Pre-mixed Charge Compression Ignition Combustion.

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

URL: http://hdl.handle.net/1808/24133

► Due to raising concerns of depleting petroleum reserves coupled with global warming, the interest in Compression Ignition (CI) engines is more than ever primarily due… (more)

Subjects/Keywords: Engineering; Energy; Mechanical engineering; Compression ratio; Environmental emissions; Internal combustion engine; Low temmperature combustion; Partially pre-mixed charge compression ignition combustion; Pre-mixed charge compression ignition combustion

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APA (6^th Edition):

Srivatsa, C. V. C. (2017). Performance and Emissions Analysis of Pre-mixed and Partially Pre-mixed Charge Compression Ignition Combustion. (Masters Thesis). University of Kansas. Retrieved from http://hdl.handle.net/1808/24133

Chicago Manual of Style (16^th Edition):

Srivatsa, Charu Vikram Chandrashekhar. “Performance and Emissions Analysis of Pre-mixed and Partially Pre-mixed Charge Compression Ignition Combustion.” 2017. Masters Thesis, University of Kansas. Accessed February 28, 2021. http://hdl.handle.net/1808/24133.

MLA Handbook (7^th Edition):

Srivatsa, Charu Vikram Chandrashekhar. “Performance and Emissions Analysis of Pre-mixed and Partially Pre-mixed Charge Compression Ignition Combustion.” 2017. Web. 28 Feb 2021.

Vancouver:

Srivatsa CVC. Performance and Emissions Analysis of Pre-mixed and Partially Pre-mixed Charge Compression Ignition Combustion. [Internet] [Masters thesis]. University of Kansas; 2017. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/1808/24133.

Council of Science Editors:

Srivatsa CVC. Performance and Emissions Analysis of Pre-mixed and Partially Pre-mixed Charge Compression Ignition Combustion. [Masters Thesis]. University of Kansas; 2017. Available from: http://hdl.handle.net/1808/24133

University of Michigan

29. Fiveland, Scott Byron. Modeling and experimental studies of a large-bore natural gas engine operating on homogeneous charge compression ignition.

Degree: PhD, Mechanical engineering, 2002, University of Michigan

URL: http://hdl.handle.net/2027.42/129444

► The Homogeneous Charge Compression Ignition (HCCI) engine is under widespread investigation due to its potential to lower NOx and particulate emissions while maintaining high thermal… (more)

▼ The Homogeneous Charge Compression Ignition (HCCI) engine is under widespread investigation due to its potential to lower NOx and particulate emissions while maintaining high thermal efficiency. Nevertheless, HCCI operation presents several challenges as the combustion event is very unstable under certain conditions. Furthermore, the HCCI combustion mode typically suffers from reduced power density and high-unburned hydrocarbon emissions (∼15 g/kW-hr). Accurate and yet computationally expedient HCCI engine models are necessary to evaluate approaches and guide experiments for improving power density, pollutant emissions, and controllability. Therefore, the objectives of this work are twofold: (1) develop a fundamentally-based quasi-dimensional model that can be used to evaluate HCCI engine performance and emissions tradeoffs over a range of conditions and configurations; (2) experimentally characterize HCCI performance, emissions, and gas-side boundary conditions under large-bore, turbo-charged configurations. In this study, natural gas was used as the fuel, primarily because its characteristics complement the HCCI process. A full-cycle simulation was developed to model the HCCI engine process under turbo-charged operation. The quasi-dimensional model couples a core gas zone to boundary layer and ring-pack crevice regions. The thermal boundary layer model is derived from energy considerations. The ring-pack model accounts for both ring position and flow exchange within its subvolumes. Two engine platforms were utilized in this study for model validation and ultimate confirmation of HCCI operating strategies. Two-component fuel data, collected at Lund University on a Volvo TD100 engine, were used to evaluate the predictive capability of the C-4 chemical mechanism for different fuel-mixtures. In parallel, experimental data were acquired on a large-bore, Caterpillar 3500 single-cylinder engine that was operated in a turbo-charged configuration under a range of thermodynamic conditions, engine speeds and compression ratios. The study has shown that a physically based quasi-dimensional model has the ability to accurately predict both HCCI engine performance as well as unburned hydrocarbon (UHC) emissions. Experiments confirmed that the engine could be operated in a stable configuration up to equivalence ratios of 0.32. The NOx emissions were on the order of .05g/kW-hr while the combustion efficiency ranged from 85 – 92%. Nevertheless, the engine thermal efficiency ranged from 30 – 39%, well below what was expected for HCCI operation. Advisors/Committee Members: Assanis, Dennis N. (advisor).

Subjects/Keywords: Bore; Emissions; Engine Perfomance; Experimental; Homogeneous Charge Compression Ignition; Large; Modeling; Natural Gas Engine; Operating; Studies

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

APA (6^th Edition):

Fiveland, S. B. (2002). Modeling and experimental studies of a large-bore natural gas engine operating on homogeneous charge compression ignition. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/129444

Chicago Manual of Style (16^th Edition):

Fiveland, Scott Byron. “Modeling and experimental studies of a large-bore natural gas engine operating on homogeneous charge compression ignition.” 2002. Doctoral Dissertation, University of Michigan. Accessed February 28, 2021. http://hdl.handle.net/2027.42/129444.

MLA Handbook (7^th Edition):

Fiveland, Scott Byron. “Modeling and experimental studies of a large-bore natural gas engine operating on homogeneous charge compression ignition.” 2002. Web. 28 Feb 2021.

Vancouver:

Fiveland SB. Modeling and experimental studies of a large-bore natural gas engine operating on homogeneous charge compression ignition. [Internet] [Doctoral dissertation]. University of Michigan; 2002. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/2027.42/129444.

Council of Science Editors:

Fiveland SB. Modeling and experimental studies of a large-bore natural gas engine operating on homogeneous charge compression ignition. [Doctoral Dissertation]. University of Michigan; 2002. Available from: http://hdl.handle.net/2027.42/129444

University of Michigan

30. Babajimopoulos, Aristotelis. Development of sequential and fully integrated CFD/multi-zone models with detailed chemical kinetics for the simulation of HCCI engines.

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

URL: http://hdl.handle.net/2027.42/124994

► Modeling the Homogeneous Charge Compression Ignition (HCCI) engine requires a balanced approach that captures both fluid motion as well as low and high temperature fuel… (more)

▼ Modeling the Homogeneous Charge Compression Ignition (HCCI) engine requires a balanced approach that captures both fluid motion as well as low and high temperature fuel oxidation. A fully coupled CFD and chemistry scheme would be the ideal HCCI modeling approach, but is computationally very expensive. As a result, modeling assumptions are required in order to develop tools that are computationally efficient, yet maintain an acceptable degree of accuracy. In the first part of this dissertation, KIVA-3V is used to investigate the mixing process in HCCI engines prior to combustion, particularly for operation with high levels of residual gas fraction. It is found that insufficient mixing of the hot residuals with the fresh charge can lead to the presence of significant temperature and composition nonuniformities in the cylinder. Then, in order to investigate the effect of temperature and composition stratification on HCCI combustion, two modeling approaches are explored. The first approach is a sequential fluid-mechanic - thermo-kinetic model. The KIVA-3V code is initiated before the exhaust event and operated over the gas exchange period, until a transition point before TDC. The three-dimensional computational domain is then mapped into a two-dimensional array of zones with different temperature and composition, which are used to initiate a multi-zone thermodynamic simulation. In the second approach, KIVA-3V is fully integrated with a multi-zone model with detailed chemical kinetics. The multi-zone model communicates with KIVA-3V at each computational timestep, as in the ideal fully coupled case. However, the composition of the cells is mapped back and forth between KIVA-3V and the multi-zone model, introducing significant computational time savings. The methodology uses a novel re-mapping technique that can account for both temperature and composition non-uniformities in the cylinder. Validation cases were developed by solving the detailed chemistry in every cell of a KIVA-3V grid. The new methodology shows good agreement with the detailed solutions. Hence, it can be used to provide insight into the fundamental effects of temperature and equivalence ratio distribution on ignition, burn duration, and emissions in HCCI engines. Advisors/Committee Members: Assanis, Dionissios N. (advisor).

Subjects/Keywords: Cfd; Chemical; Combustion; Detailed; Development; Engines; Fully; Hcci; Homogeneous Charge Compression Ignition; Integrated; Kinetics; Models; Multi; Sequential; Simulation; Zone

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

APA (6^th Edition):

Babajimopoulos, A. (2005). Development of sequential and fully integrated CFD/multi-zone models with detailed chemical kinetics for the simulation of HCCI engines. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/124994

Chicago Manual of Style (16^th Edition):

Babajimopoulos, Aristotelis. “Development of sequential and fully integrated CFD/multi-zone models with detailed chemical kinetics for the simulation of HCCI engines.” 2005. Doctoral Dissertation, University of Michigan. Accessed February 28, 2021. http://hdl.handle.net/2027.42/124994.

MLA Handbook (7^th Edition):

Babajimopoulos, Aristotelis. “Development of sequential and fully integrated CFD/multi-zone models with detailed chemical kinetics for the simulation of HCCI engines.” 2005. Web. 28 Feb 2021.

Vancouver:

Babajimopoulos A. Development of sequential and fully integrated CFD/multi-zone models with detailed chemical kinetics for the simulation of HCCI engines. [Internet] [Doctoral dissertation]. University of Michigan; 2005. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/2027.42/124994.

Council of Science Editors:

Babajimopoulos A. Development of sequential and fully integrated CFD/multi-zone models with detailed chemical kinetics for the simulation of HCCI engines. [Doctoral Dissertation]. University of Michigan; 2005. Available from: http://hdl.handle.net/2027.42/124994

Open Access Theses and Dissertations