subject:(Homogeneous Charge Combustion)

1. 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

Record Details Similar Records Cite « Share

❌

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

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 April 11, 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. 11 Apr 2021.

Vancouver:

Broekaert S. A study of the heat transfer in low temperature combustion engines. [Internet] [Thesis]. Ghent University; 2018. [cited 2021 Apr 11]. 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 Bradford

2. 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

Record Details Similar Records Cite « Share

❌

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

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 April 11, 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. 11 Apr 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 Apr 11]. 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

3. 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)

▼

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

Record Details Similar Records Cite « Share

❌

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 April 11, 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. 11 Apr 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 Apr 11]. 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

4. 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

►

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)

▼

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

Record Details Similar Records Cite « Share

❌

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

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 April 11, 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. 11 Apr 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 Apr 11]. 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

Indian Institute of Science

5. 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

Record Details Similar Records Cite « Share

❌

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

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 April 11, 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. 11 Apr 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 Apr 11]. 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

University of California – Berkeley

6. 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

Record Details Similar Records Cite « Share

❌

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 April 11, 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. 11 Apr 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 Apr 11]. 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

University of Windsor

7. 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

Record Details Similar Records Cite « Share

❌

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

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 April 11, 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. 11 Apr 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 Apr 11]. 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

University of Michigan

8. 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

Record Details Similar Records Cite « Share

❌

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

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 April 11, 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. 11 Apr 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 Apr 11]. 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

9. 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

Record Details Similar Records Cite « Share

❌

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 April 11, 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. 11 Apr 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 Apr 11]. 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

Loughborough University

10. 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

Record Details Similar Records Cite « Share

❌

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 April 11, 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. 11 Apr 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 Apr 11]. 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

11. Lillo, Peter. Topological Development of Homogeneous-Charge and Stratified-Charge Flames in an Internal Combustion Engine.

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

URL: http://hdl.handle.net/2027.42/135897

► No technology can currently replace fossil fuel powered internal combustion engines as the primary source of transportation power. For better or worse, the next generation… (more)

▼ No technology can currently replace fossil fuel powered internal combustion engines as the primary source of transportation power. For better or worse, the next generation of automobiles will continue to be powered by combustion. As such, it is in our best interest to learn how to burn fuel in the smartest manner. There are many advanced combustion strategies that promise efficiency improvements over conventional strategies, most of which have failed to make it onto the road due to technical deficiencies. Many of these strategies, such as spray-guided stratified-charge combustion, rely upon the precise partial mixing of fuel with oxidizer inside the combustion chamber. Advanced computational tools are being developed to aid such challenging designs. However, a lack of understanding of in-cylinder flame physics and computational power limitations continues to hinder the predictive abilities of engine models. In this work, engine flame topological development is studied. Flame wrinkled-ness is both one of the most important and poorly understood engine combustion phenomena. Generally, a flame may wrinkle for two reasons: (i) its own naturally instabilities and/or (ii) through interaction with turbulent flow. The relative contribution of these two causes towards flame wrinkled-ness in the engine environment was unclear so targeted experiments were performed to provide some clarity. The development of flame wrinkled-ness within an optically accessible engine was measured with a combination of planar laser induced fluorescence and stereo particle image velocimetry under homogeneous-charge and stratified-charge conditions. From this, equivalence ratio, charge velocities, and flame wrinkled-ness were quantified and analyzed. For the iso-octane/toluene mixtures studied the flame wrinkling was insensitive to thermo-diffusive flame front instabilities. The relative contribution of wrinkles of various spatial scales towards overall flame wrinkled-ness was also measured. Homogeneous-charge flames generally had lower wrinkling factors than stratified-charge flames. Overall, flame wrinkled-ness increased with flame size under both modes of engine operation. Large flames demonstrated an ability to maintain more large scale wrinkles than small flames, which contributed to their overall higher levels of wrinkled-ness. Based on the observations, suggestions are provided for those who are developing advanced homogeneous and stratified-charge engine models. Advisors/Committee Members: Sick, Volker (committee member), Driscoll, James F (committee member), Boehman, Andre L (committee member), Martz, Jason Brian (committee member), Reuss, David L (committee member).

Subjects/Keywords: Internal Combustion Engine; Engine Flame Topology; Homogeneous Charge Combustion; Stratified Charge Combustion; Optical Diagnostics; Flame Wrinkling; Mechanical Engineering; Engineering

…148 3.2.5.1 Homogeneous-Charge Flame Contour Recognition… …165 4.3 Homogeneous-Charge Engine Performance… …170 4.3.2 Off-stoichiometric Homogeneous Charge Mapping… …172 4.3.3 Homogeneous-Charge Operational Conditions Chosen for the Wrinkled-ness Study 173… …179 4.4.3 Stratified-Charge vs Homogeneous-Charge Engine Performance…

11 more images…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lillo, P. (2016). Topological Development of Homogeneous-Charge and Stratified-Charge Flames in an Internal Combustion Engine. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/135897

Chicago Manual of Style (16^th Edition):

Lillo, Peter. “Topological Development of Homogeneous-Charge and Stratified-Charge Flames in an Internal Combustion Engine.” 2016. Doctoral Dissertation, University of Michigan. Accessed April 11, 2021. http://hdl.handle.net/2027.42/135897.

MLA Handbook (7^th Edition):

Lillo, Peter. “Topological Development of Homogeneous-Charge and Stratified-Charge Flames in an Internal Combustion Engine.” 2016. Web. 11 Apr 2021.

Vancouver:

Lillo P. Topological Development of Homogeneous-Charge and Stratified-Charge Flames in an Internal Combustion Engine. [Internet] [Doctoral dissertation]. University of Michigan; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2027.42/135897.

Council of Science Editors:

Lillo P. Topological Development of Homogeneous-Charge and Stratified-Charge Flames in an Internal Combustion Engine. [Doctoral Dissertation]. University of Michigan; 2016. Available from: http://hdl.handle.net/2027.42/135897

University of Michigan

12. 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

Record Details Similar Records Cite « Share

❌

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 April 11, 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. 11 Apr 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 Apr 11]. 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

Michigan Technological University

13. 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;

Record Details Similar Records Cite « Share

❌

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

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 April 11, 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. 11 Apr 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 Apr 11]. Available from: https://digitalcommons.mtu.edu/etdr/384.

Council of Science Editors:

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

University of Michigan

14. 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

Record Details Similar Records Cite « Share

❌

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

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 April 11, 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. 11 Apr 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 Apr 11]. 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

15. 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

Record Details Similar Records Cite « Share

❌

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 April 11, 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. 11 Apr 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 Apr 11]. 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

University of Michigan

16. Chang, Junseok. Thermal characterization and heat transfer study of a gasoline homogeneous charge compression ignition engine via measurements of instantaneous wall temperature and heat flux in the combustion chamber.

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

URL: http://hdl.handle.net/2027.42/124641

► An experimental study was performed to provide qualitative and quantitative insight into combustion characteristics and gas to wall heat transfer in a gasoline-fueled Homogeneous-Charge-Compression-Ignition (HCCI)… (more)

▼ An experimental study was performed to provide qualitative and quantitative insight into combustion characteristics and gas to wall heat transfer in a gasoline-fueled Homogeneous-Charge-Compression-Ignition (HCCI) engine. The single-cylinder engine utilized exhaust gas re-breathing to obtain large amounts of hot residual gas needed to promote ignition. In-cylinder pressure and exhaust emission measurement were employed for combustion diagnostics by heat release analysis. Fast response thermocouples were embedded in the piston top and cylinder head surface to measure instantaneous wall temperature and heat flux, which provided critical information for a thorough understanding of the heat transfer process. A tested HCCI engine had great sensitivity to thermo-chemical conditions, for instance, wall temperature, intake charge temperature, A/F ratio, and internal residual fraction. The engine had less sensitivity to changes in flow motion via different Swirl-Control-Valve (SCV) settings. However, the SCV fully closed setting was an exception demonstrating significantly retarded burn rate due to the residual gas heat loss in the intake port and its subsequent re-circulation. Local heat flux measurements indicated very small spatial variations in the case of operation with fully premixed fuel-air charge. Variations of the heat flux at some locations in the case of direct injection were attributed to fuel impingement and fuel film dynamics. Very low spatial variations of heat flux enabled the use of the spatially averaged heat flux for evaluating global heat transfer correlations. One of the most popular models, the Woschni expression, was shown to be inadequate for the HCCI engine. The problem was traced back to the flame propagation term in the correlation that was not appropriate for HCCI combustion. Consequently, a modified model was proposed which significantly improved the features of the predicted crank-angle resolved heat flux profile, and showed very good agreement in terms of magnitude and phasing over the range of conditions. Advisors/Committee Members: Assanis, Dionissios N. (advisor), Filipi, Zoran S. (advisor).

Subjects/Keywords: Characterization; Charge Compression Ignition Engine; Combustion Chamber; Gasoline; Heat Flux; Homogeneous; Instantaneous; Measurements; Study; Thermal; Transfer; Via; Wall Temperature

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Chang, J. (2004). Thermal characterization and heat transfer study of a gasoline homogeneous charge compression ignition engine via measurements of instantaneous wall temperature and heat flux in the combustion chamber. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/124641

Chicago Manual of Style (16^th Edition):

Chang, Junseok. “Thermal characterization and heat transfer study of a gasoline homogeneous charge compression ignition engine via measurements of instantaneous wall temperature and heat flux in the combustion chamber.” 2004. Doctoral Dissertation, University of Michigan. Accessed April 11, 2021. http://hdl.handle.net/2027.42/124641.

MLA Handbook (7^th Edition):

Chang, Junseok. “Thermal characterization and heat transfer study of a gasoline homogeneous charge compression ignition engine via measurements of instantaneous wall temperature and heat flux in the combustion chamber.” 2004. Web. 11 Apr 2021.

Vancouver:

Chang J. Thermal characterization and heat transfer study of a gasoline homogeneous charge compression ignition engine via measurements of instantaneous wall temperature and heat flux in the combustion chamber. [Internet] [Doctoral dissertation]. University of Michigan; 2004. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2027.42/124641.

Council of Science Editors:

Chang J. Thermal characterization and heat transfer study of a gasoline homogeneous charge compression ignition engine via measurements of instantaneous wall temperature and heat flux in the combustion chamber. [Doctoral Dissertation]. University of Michigan; 2004. Available from: http://hdl.handle.net/2027.42/124641

17. Jade, Shyam Dilip. Transient Load-Speed Control in Multi-Cylinder Recompression HCCI Engines.

Degree: PhD, Mechanical Engineering, 2014, University of Michigan

URL: http://hdl.handle.net/2027.42/107072

► Strict proposed fuel economy and emissions standards for automotive internal combustion engines have motivated the study of advanced low-temperature combustion modes that promise higher combustion… (more)

▼ Strict proposed fuel economy and emissions standards for automotive internal combustion engines have motivated the study of advanced low-temperature combustion modes that promise higher combustion efficiencies with low engine-out emissions. This work presents modeling and control results for one such combustion mode – recompression homogeneous charge compression ignition (HCCI) combustion. Regulating desired charge properties in recompression HCCI involves the retention of a large amount of the residual charge between engine cycles, thus introducing significant inter-cycle feedback in the system. This work considers a baseline controller from literature, and proposes two improved model-based control strategies. The controllers use exhaust valve timing and fuel injection timings to track combustion phasings during transitions in the HCCI region of the multi-cylinder engine load-speed operating map. Fast and stable control of these transitions is demonstrated, which maximizes the length of stay in the HCCI region, and hence the efficiency benefit of advanced combustion. The baseline controller, which is a feedback-feedforward controller adapted from literature, is tuned using a low-order, discrete-time, control-oriented model that describes the stable, high efficiency HCCI region. The first improved control strategy augments the baseline controller with a reference or fuel governor that modifies transient fuel mass commands during large load transitions, when the possibility of future actuator constraint violations exists. This approach is shown in experiments to improve the combustion phasing and load responses, as well as prevent engine misfires. Issues with high cyclic variability during late phasing and low load conditions, and their impact on transient performance, are discussed. These issues are physically explained through recompression heat release caused due to unburned and recycled fuel. The control-oriented model is augmented with recompression heat release to predict the onset of the oscillatory, high variability region. The second improved control strategy uses this physical understanding to improve combustion phasing tracking performance. Transitions tested on a multicylinder HCCI engine include load transitions at fixed engine speeds, engine speed ramps at fixed load, simultaneous load and speed transitions, and select FTP75 drive-cycle transitions with high load slew rates. This improved model-based control strategy is proposed as a solution for the HCCI transient control problem. Advisors/Committee Members: Hellstrom, Erik (committee member), Stefanopoulou, Anna G. (committee member), Kolmanovsky, Ilya Vladimir (committee member), Sick, Volker (committee member).

Subjects/Keywords: Homogeneous Charge Compression Ignition; Cyclic Variability; Reference Governor; Low Temperature Combustion; Transient Combustion Phasing Control; Mechanical Engineering; Transportation; Engineering

…homogeneous charge compression ignition (HCCI) combustion. Regulating desired charge… …HCCI (homogeneous charge compression ignition) combustion, which is one such… …2 1.1.1 Homogeneous Charge Compression Ignition The HCCI combustion strategy aims to… …The use of HCCI combustion at low load levels is complicated by the need to prevent charge… …combustion is fixed by the temperature, pressure and composition of the in-cylinder charge. The…

10 more images…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Jade, S. D. (2014). Transient Load-Speed Control in Multi-Cylinder Recompression HCCI Engines. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/107072

Chicago Manual of Style (16^th Edition):

Jade, Shyam Dilip. “Transient Load-Speed Control in Multi-Cylinder Recompression HCCI Engines.” 2014. Doctoral Dissertation, University of Michigan. Accessed April 11, 2021. http://hdl.handle.net/2027.42/107072.

MLA Handbook (7^th Edition):

Jade, Shyam Dilip. “Transient Load-Speed Control in Multi-Cylinder Recompression HCCI Engines.” 2014. Web. 11 Apr 2021.

Vancouver:

Jade SD. Transient Load-Speed Control in Multi-Cylinder Recompression HCCI Engines. [Internet] [Doctoral dissertation]. University of Michigan; 2014. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2027.42/107072.

Council of Science Editors:

Jade SD. Transient Load-Speed Control in Multi-Cylinder Recompression HCCI Engines. [Doctoral Dissertation]. University of Michigan; 2014. Available from: http://hdl.handle.net/2027.42/107072

18. Hoffman, Mark A. Characterization of Combustion Chamber Deposits Formed During Homogeneous Charge Compression Ignition and the Impact of a Thermal Barrier Coating on Deposit Accumulation and HCCI Operability.

Degree: PhD, Mechanical Engineering, 2012, University of Michigan

URL: http://hdl.handle.net/2027.42/96098

► Combustion chamber deposits, CCD, have been shown to influence the operational range of homogeneous charge compression ignition, HCCI. CCD insulate the combustion chamber during the… (more)

▼ Combustion chamber deposits, CCD, have been shown to influence the operational range of homogeneous charge compression ignition, HCCI. CCD insulate the combustion chamber during the intake and compression strokes, preserving enough charge temperature to shift the HCCI operational range to lower loads where the HCCI fuel economy benefit over traditional spark-ignited combustion is at a maximum. However, the drive cycle dependent CCD accumulation and burn-off creates uncontrolled shifting of the HCCI operability range, which must be mitigated in a practical multi-mode engine. Ideally, the beneficial shift of HCCI operation to lower loads provided by CCD could be obtained while avoiding uncontrolled shifting of the operational range. To provide fundamental insight into CCD properties, CCD thermal diffusivity was non-destructively measured during HCCI combustion (in-situ firing), during engine motoring (in-situ motoring) and in a specially designed radiation chamber (ex-situ). The diffusivity measurement methodology utilized the phase lag in sub-CCD temperature signals and the one dimensional heat diffusion equation. Comparisons of the CCD diffusivity values determined from the different measurement environments allowed the separation of several thermal and morphological CCD characteristics. The interaction of fuel with the CCD morphology was shown to have no significant impact on the diffusivity of CCD accumulated on the cylinder head. CCD less than thirty micrometers were spatially sparse and contained line-of-sight pathways though which the ex-situ radiation could pass and the in-situ convection could not. Thicker CCD exhibited differential sensitivity to radiation and convection heat transfer modes, which was utilized to quantify the effective porosity of the CCD through a novel radiation penetration factor. The impact of thermal barrier coatings on CCD accumulation and HCCI operability was assessed by testing a piston coated with magnesium zirconate, MgZr. The radiation penetration factor determined the MgZr coating to have 2.5 times the effective porosity of CCD. Reductions in CCD accumulation resulted from the elevated surface temperature of the MgZr. In addition, reduced cylinder head CCD accumulation was speculatively attributed to interaction between the surface roughness of the MgZr piston and the fuel spray. Overall, the HCCI operability shift due to CCD accumulation was reduced by the MgZr piston. Advisors/Committee Members: Borgnakke, Claus (committee member), Filipi, Zoran S. (committee member), Ihme, Matthias (committee member), Reuss, David L. (committee member), Sick, Volker (committee member).

Subjects/Keywords: Combustion Chamber Deposits; Combustion; Homogeneous Charge Compression Ignition; Thermal Barrier Coating; Heat Transfer; Porosity; Mechanical Engineering; Engineering

…operational range of homogeneous charge compression ignition, HCCI. CCD insulate the combustion… …coatings and determine their impact on HCCI combustion. 1.1 Homogeneous Charge Compression… …Benefits of Homogeneous Charge Compression Ignition HCCI combustion can provide many benefits… …combustion. 1.2.2 Influence of Combustion Chamber Deposits on Homogeneous Charge Compression… …mode engines which incorporate both Homogeneous Charge Compression Ignition, HCCI, and spark…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Hoffman, M. A. (2012). Characterization of Combustion Chamber Deposits Formed During Homogeneous Charge Compression Ignition and the Impact of a Thermal Barrier Coating on Deposit Accumulation and HCCI Operability. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/96098

Chicago Manual of Style (16^th Edition):

Hoffman, Mark A. “Characterization of Combustion Chamber Deposits Formed During Homogeneous Charge Compression Ignition and the Impact of a Thermal Barrier Coating on Deposit Accumulation and HCCI Operability.” 2012. Doctoral Dissertation, University of Michigan. Accessed April 11, 2021. http://hdl.handle.net/2027.42/96098.

MLA Handbook (7^th Edition):

Hoffman, Mark A. “Characterization of Combustion Chamber Deposits Formed During Homogeneous Charge Compression Ignition and the Impact of a Thermal Barrier Coating on Deposit Accumulation and HCCI Operability.” 2012. Web. 11 Apr 2021.

Vancouver:

Hoffman MA. Characterization of Combustion Chamber Deposits Formed During Homogeneous Charge Compression Ignition and the Impact of a Thermal Barrier Coating on Deposit Accumulation and HCCI Operability. [Internet] [Doctoral dissertation]. University of Michigan; 2012. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2027.42/96098.

Council of Science Editors:

Hoffman MA. Characterization of Combustion Chamber Deposits Formed During Homogeneous Charge Compression Ignition and the Impact of a Thermal Barrier Coating on Deposit Accumulation and HCCI Operability. [Doctoral Dissertation]. University of Michigan; 2012. Available from: http://hdl.handle.net/2027.42/96098

19. Larimore, Jacob William. Experimental Analysis and Control of Recompression Homogeneous Charge Compression Ignition Combustion at the High Cyclic Variability Limit.

Degree: PhD, Mechanical Engineering, 2014, University of Michigan

URL: http://hdl.handle.net/2027.42/107231

► The automotive industry currently faces many challenges pertaining to strict emissions and fuel consumption constraints for a sustainable society. These regulations have motivated the investigation… (more)

▼ The automotive industry currently faces many challenges pertaining to strict emissions and fuel consumption constraints for a sustainable society. These regulations have motivated the investigation of low temperature combustion modes such as homogeneous charge compression ignition (HCCI) as a potential solution to meet these demands. HCCI combustion is characterized by high efficiency and low engine-out emissions. However, this advanced combustion mode is limited in the speed-load operating space due to high pressure rise rates for increased loads. Often higher loads are run at later combustion phasings to reduce pressure rise rates, however high cyclic variability (CV) can also be a limiting factor for late combustion phasings. This work presents advancements in the understanding of high variability dynamics in recompression HCCI as well as methods for control of CV and load transitions which typically encounter regions of high variability. Standard in-cylinder pressure based analysis methods are extended for use on high variability data. This includes a method of determining the trapped residual mass in real time. Determination of the residual mass is critical in recompression HCCI because of the combustion's sensitivity to the thermal energy contained within the residual charge. Trapping too much or little residuals can lead to ringing or misfires and CV, respectively. Various levels of CV are studied using large experimental data sets to ensure statistical relevance. The cycle resolved analysis of this data has allowed for the development of a predictive model of the variability associated with lean late phasing combustion. This model is used to develop control which can suppress cyclic variability at steady state. Knowledge about steady state control of CV and its oscillatory dynamics is further applied to the development of an adaptive controller. The adaptive controller uses a parameter estimation scheme in the feedforward component of a baseline midranging structure. The adaptive feedforward component enables the ability to correct for modeling errors and reduces parameterization effort. Experimental results demonstrate that the control is effective at navigating through large load transients while avoiding excess amounts of variability. Additionally, the actuators spend more time in a region of high authority when compared to non-adaptive control. Advisors/Committee Members: Stefanopoulou, Anna G. (committee member), Hellstrom, Erik (committee member), Sun, Jing (committee member), Boehman, Andre L. (committee member), Jiang, Li (committee member).

Subjects/Keywords: Homogeneous Charge Compression Ignition; Cyclic Variability; Control Systems; Dynamical Systems; Advanced Combustion; Electrical Engineering; Mechanical Engineering; Engineering

…combustion efficiencies and lower heat losses. Homogeneous charge compression ignition (HCCI… …commercial vehicles [9]. 1.1.1 Homogeneous Charge Compression Ignition Combustion… …regulations have motivated the investigation of low temperature combustion modes such as homogeneous… …Homogeneous charge compression ignition (HCCI) is characterized by compressiondriven near… …the temperature, pressure, and composition of the pre-combustion cylinder charge. This…

10 more images…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Larimore, J. W. (2014). Experimental Analysis and Control of Recompression Homogeneous Charge Compression Ignition Combustion at the High Cyclic Variability Limit. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/107231

Chicago Manual of Style (16^th Edition):

Larimore, Jacob William. “Experimental Analysis and Control of Recompression Homogeneous Charge Compression Ignition Combustion at the High Cyclic Variability Limit.” 2014. Doctoral Dissertation, University of Michigan. Accessed April 11, 2021. http://hdl.handle.net/2027.42/107231.

MLA Handbook (7^th Edition):

Larimore, Jacob William. “Experimental Analysis and Control of Recompression Homogeneous Charge Compression Ignition Combustion at the High Cyclic Variability Limit.” 2014. Web. 11 Apr 2021.

Vancouver:

Larimore JW. Experimental Analysis and Control of Recompression Homogeneous Charge Compression Ignition Combustion at the High Cyclic Variability Limit. [Internet] [Doctoral dissertation]. University of Michigan; 2014. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2027.42/107231.

Council of Science Editors:

Larimore JW. Experimental Analysis and Control of Recompression Homogeneous Charge Compression Ignition Combustion at the High Cyclic Variability Limit. [Doctoral Dissertation]. University of Michigan; 2014. Available from: http://hdl.handle.net/2027.42/107231

20. Nuesch, Sandro Patrick. Analysis and Control of Multimode Combustion Switching Sequence.

Degree: PhD, Mechanical Engineering, 2015, University of Michigan

URL: http://hdl.handle.net/2027.42/116660

► Highly dilute, low temperature combustion technologies, such as homogeneous charge compression ignition (HCCI), show significant improvements in internal combustion engine fuel efficiency and engine-out NOx… (more)

▼ Highly dilute, low temperature combustion technologies, such as homogeneous charge compression ignition (HCCI), show significant improvements in internal combustion engine fuel efficiency and engine-out NOx emissions. These improvements, however, occur at limited operating range and conventional spark ignition (SI) combustion is still required to fulfill the driver's high torque demands. In consequence, such multimode engines involve discrete switches between the two distinct combustion modes. Such switches unfortunately require a finite amount of time, during which they exhibit penalties in efficiency. Along with its challenges, the design of such a novel system offers new degrees of freedom in terms of engine and aftertreatment specifications. Prior assessments of this technology were based on optimistic assumptions and neglected switching dynamics. Furthermore, emissions and driveability were not fully addressed. To this end, a comprehensive simulation framework, which accounts for above-mentioned penalties and incorporates interactions between multimode engine, driveline, and three-way catalyst (TWC), has been developed. Experimental data was used to parameterize a novel mode switch model, formulated as finite-state machine. This model was combined with supervisory controller designs, which made the switching decision. The associated drive cycle results were analyzed and it was seen that mode switches have significant influence on overall fuel economy, and the issue of drivability needs to be addressed within the supervisory strategy. After expanding the analysis to address emissions assuming a TWC, it was shown that, in practice, HCCI operation requires the depletion of the TWC's oxygen storage capacity (OSC). For large OSCs the resulting lean-rich cycling nullifies HCCI's original efficiency benefits. In addition, future emissions standards are still unlikely to be fulfilled, deeming a system consisting of such a multimode engine and TWC with generous OSC unfavorable. In view of these difficulties, the modeling framework was extended to a mild hybrid electric vehicle (HEV) allowing a prolonged operation in HCCI mode with associated fuel economy benefits during city driving. Further analysis on how to reduce NOx while maintaining fuel economy resulted in a counterintuitive suggestion. It was deemed beneficial to constrain the HCCI operation to a small region, exhibiting lowest NOx, while reducing instead of increasing the OSC. Advisors/Committee Members: Stefanopoulou, Anna G (committee member), Kolmanovsky, Ilya Vladimir (committee member), Boehman, Andre L (committee member), Martz, Jason Brian (committee member).

Subjects/Keywords: Internal combustion engine; Supervisory control of a multimode combustion engine; Homogeneous charge compression ignition (HCCI); Drive cycle analysis for fuel economy and emissions; Mechanical Engineering; Engineering

…combustion mode with high potential is homogeneous charge compression ignition (HCCI)… …multimode combustion engine. 1.2 Homogeneous Charge Compression Ignition The two most common… …1 1.2 Homogeneous Charge Compression Ignition… …homogeneous charge Coefficient of variance Cyclic variability Continuously variable transmission… …technologies, such as homogeneous charge compression ignition (HCCI), show significant…

13 more images…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Nuesch, S. P. (2015). Analysis and Control of Multimode Combustion Switching Sequence. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/116660

Chicago Manual of Style (16^th Edition):

Nuesch, Sandro Patrick. “Analysis and Control of Multimode Combustion Switching Sequence.” 2015. Doctoral Dissertation, University of Michigan. Accessed April 11, 2021. http://hdl.handle.net/2027.42/116660.

MLA Handbook (7^th Edition):

Nuesch, Sandro Patrick. “Analysis and Control of Multimode Combustion Switching Sequence.” 2015. Web. 11 Apr 2021.

Vancouver:

Nuesch SP. Analysis and Control of Multimode Combustion Switching Sequence. [Internet] [Doctoral dissertation]. University of Michigan; 2015. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2027.42/116660.

Council of Science Editors:

Nuesch SP. Analysis and Control of Multimode Combustion Switching Sequence. [Doctoral Dissertation]. University of Michigan; 2015. Available from: http://hdl.handle.net/2027.42/116660

21. Lee, Donghoon. Closed-Loop Combustion Control of Advanced Internal Combustion Engines.

Degree: PhD, Mechanical Engineering, 2011, University of Michigan

URL: http://hdl.handle.net/2027.42/84501

► Current emphasis on decreasing vehicle fuel consumption and carbon dioxide (CO2) emission from the automotive sector directs many research efforts towards two gasoline engine technologies,… (more)

▼ Current emphasis on decreasing vehicle fuel consumption and carbon dioxide (CO2) emission from the automotive sector directs many research efforts towards two gasoline engine technologies, namely, the Homogeneous Charge Compression Ignition (HCCI) engines, and the downsized TurboCharged (TC) Spark Ignition Direct Injection (SIDI) engines with variable valve timing (VVT). In the HCCI category, many actuation strategies have been proposed with the more popular being the dual-fuel strategies and the high residual recycling. In this thesis, a heat recycling strategy is considered, specifically, a heated-air inlet HCCI engine with two intake throttles that control the cold and hot air streams. To facilitate the control analysis and development, a physics-based crank-angle resolved and a mean-value models are developed for feedback controller design. We discover that the combustion duration defined as the duration between the crank angle of 10% and 90% fuel burned, provides a universal set point for all speeds and loads for both combustion stability and fuel efficiency. Based on a novel allocation of two actuators, the hot and cold throttles, a feedback controller is designed and simulated to regulate the combustion duration at a desired value during load changes. In the category of the TC SIDI engines, we address the important problem of reducing the calibration complexity when these engines are intended to run on gasoline (E0) and/or a blend of up to 85% ethanol (E85). Typically, there is variability in the optimal VVT and spark values for every blend of gasoline-ethanol. This variability burdens the calibration task for these engines with many degrees of freedom (throttle, VVT, wastegate, fuel injection timing and duration, and spark timing). We first address the transient coupling between throttle and VVT in controlling the air charge. A model-based valve compensator is designed to improve the transient behavior of cylinder charge and torque during tip-ins and tip-outs with the VVT system transitions from set-points. An extremum seeking (ES) controller tuned based on the engine model demonstrates the convergence of both spark timing and VVT to the optimal values to achieve the best fuel efficiency. Advisors/Committee Members: Stefanopoulou, Anna G. (committee member), Filipi, Zoran S. (committee member), Grizzle, Jessy W. (committee member), Kokkolaras, Michael (committee member).

Subjects/Keywords: Closed-loop Combustion Control; Homogeneous Charge Compression Ignition (HCCI) Engine; TurboCharged (TC) Spark Ignition Direct Injection (SIDI) Engines With Variable Valve Timing (VVT); Mechanical Engineering; Engineering

…towards two gasoline engine technologies, namely, the Homogeneous Charge Compression Ignition… …this dissertation, a heated-air inlet homogeneous charge compression ignition (HCCI)… …Homogeneous Charge compression Ignition (HCCI) engine concept, also called Active Thermo… …combustion duration, ∆θcomb = 7.5 CAD, for different loads m f [mg/cycle] and hot inlet… …RPM. . 4.6 Cylinder air charge rate Wcyl response of the turbocharged engine on VVT overlap…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lee, D. (2011). Closed-Loop Combustion Control of Advanced Internal Combustion Engines. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/84501

Chicago Manual of Style (16^th Edition):

Lee, Donghoon. “Closed-Loop Combustion Control of Advanced Internal Combustion Engines.” 2011. Doctoral Dissertation, University of Michigan. Accessed April 11, 2021. http://hdl.handle.net/2027.42/84501.

MLA Handbook (7^th Edition):

Lee, Donghoon. “Closed-Loop Combustion Control of Advanced Internal Combustion Engines.” 2011. Web. 11 Apr 2021.

Vancouver:

Lee D. Closed-Loop Combustion Control of Advanced Internal Combustion Engines. [Internet] [Doctoral dissertation]. University of Michigan; 2011. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2027.42/84501.

Council of Science Editors:

Lee D. Closed-Loop Combustion Control of Advanced Internal Combustion Engines. [Doctoral Dissertation]. University of Michigan; 2011. Available from: http://hdl.handle.net/2027.42/84501

ETH Zürich

22. Mitakos, Dimitrios A. Experimental Investigations for Phenomenological Modelling of Two-Stage Auto-Ignition under HCCI Conditions.

Degree: 2014, ETH Zürich

URL: http://hdl.handle.net/20.500.11850/100287

Subjects/Keywords: INTERNAL COMBUSTION ENGINES (HEAT ENGINES); AUTOOXIDATION + SELBSTZÜNDUNG + ENTFLAMMBARKEIT + FLAMMPUNKT (CHEMISCHE KINETIK); ZÜNDUNG + ZÜNDTEMPERATUR + ZÜNDEIGENSCHAFTEN (BRENNSTOFFTECHNOLOGIE); HOMOGENE KOMPRESSIONSZÜNDUNG, HCCI (VERBRENNUNGSMOTOREN); IGNITION PROPERTIES + IGNITION TEMPERATURE (FUEL TECHNOLOGY); HOMOGENEOUS CHARGE COMPRESSION IGNITION, HCCI (INTERNAL COMBUSTION ENGINES); AUTO-OXIDATION + SELF-IGNITION + FLAMMABILITY + FLASH POINT (CHEMICAL KINETICS); VERBRENNUNGSKRAFTMASCHINEN (WÄRMEKRAFTMASCHINEN); info:eu-repo/classification/ddc/620; Engineering & allied operations

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Mitakos, D. A. (2014). Experimental Investigations for Phenomenological Modelling of Two-Stage Auto-Ignition under HCCI Conditions. (Doctoral Dissertation). ETH Zürich. Retrieved from http://hdl.handle.net/20.500.11850/100287

Chicago Manual of Style (16^th Edition):

Mitakos, Dimitrios A. “Experimental Investigations for Phenomenological Modelling of Two-Stage Auto-Ignition under HCCI Conditions.” 2014. Doctoral Dissertation, ETH Zürich. Accessed April 11, 2021. http://hdl.handle.net/20.500.11850/100287.

MLA Handbook (7^th Edition):

Mitakos, Dimitrios A. “Experimental Investigations for Phenomenological Modelling of Two-Stage Auto-Ignition under HCCI Conditions.” 2014. Web. 11 Apr 2021.

Vancouver:

Mitakos DA. Experimental Investigations for Phenomenological Modelling of Two-Stage Auto-Ignition under HCCI Conditions. [Internet] [Doctoral dissertation]. ETH Zürich; 2014. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/20.500.11850/100287.

Council of Science Editors:

Mitakos DA. Experimental Investigations for Phenomenological Modelling of Two-Stage Auto-Ignition under HCCI Conditions. [Doctoral Dissertation]. ETH Zürich; 2014. Available from: http://hdl.handle.net/20.500.11850/100287

23. Komninos, Neofytos. Προαναμεμειγμένη καύση κινητήρων ντήζελ.

Degree: 2007, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/28512

►

The objective of the doctoral dissertation is the study of Homogeneous Charge Compression Ignition combustion through simulation. Τhe dissertation initially involved the creation of a… (more)

▼

The objective of the doctoral dissertation is the study of Homogeneous Charge Compression Ignition combustion through simulation. Τhe dissertation initially involved the creation of a single-zone model followed by a new multi-zone model, both simulating the closed part of the engine cycle (compression, combustion and expansion). The single-zone model was used for the parametric investigation and the description of HCCI combustion. The multi-zone model includes sub-models for the description of combustion (Chemical Kinetics using CHEMKIN) and heat and mass transfer within the combustion chamber. Thus it provides an estimation of the temperature field and the mass flow from/to the crevices. These improvements allow a better understanding of the physicochemical processes involved in HCCI combustion and predictions concerning the ignition angle, the combustion rate and the emissions are more accurate. The multi-zone model was used for the parametric investigation of HCCI combustion, providing a useful description of physicochemical processes as well. The simulation produced the following results: 1. Temperature and compression ratio significantly affect the ignition angle, whilst initial pressure and fuel quantity have a lower effect, though they do determine the engine load. 2. Engine speed affects ignition angle as it determines the available time for the reactions which lead to ignition. 3. It is essential to model the chemical reactions which take place at low and high temperatures, in order to predict ignition angle and combustion rate. 4. The multi-zone model provides more accurate results than the single–zone model as far as physicochemical processes are concerned, at the expense of increased computational time. 5. Multi-zone model simulation revealed that heat and mass transfer mechanisms determine the temperature field within the combustion chamber and directly affect the formation of unburned hydrocarbons and carbon monoxide. It was concluded that the interaction between the crevices and the relatively cold regions located at the vicinity of the combustion chamber walls, is mainly responsible for the creation of CO and HC emissions. 6. The model was validated –as regards performance and emissions of HCCI engines- against experimental results provided by the Lund Institute of Technology. The validation revealed that the model describes qualitatively the combustion mechanism and the pollutant emissions formation.

Σκοπός της διδακτορικής διατριβής είναι η μελέτη της προαναμεμειγμένης καύσης εμβολοφόρων κινητήρων με χρήση υπολογιστικής προσομοίωσης. Kατά τη διάρκεια της διατριβής αναπτύχθηκε μονοζωνικό και πρωτότυπο πολυζωνικό μοντέλο προσομοίωσης του κλειστού κύκλου λειτουργίας του κινητήρα (συμπίεση-καύση-εκτόνωση). Το μονοζωνικό μοντέλο, χρησιμοποιήθηκε για την διεξαγωγή παραμετρικής διερεύνησης και την περιγραφή της προαναμεμειγμένης καύσης. Το πρωτότυπο πολυζωνικό μοντέλο περιγράφει την καύση (χημική κινητική με χρήση λογισμικού CHEMKIN) και τη μεταφοράς μάζας και θερμότητας εντός του θαλάμου καύσης. Έτσι…

Subjects/Keywords: Προαναμεμειγμένη – Ομογενοποιημένη Καύση; Προσομοίωση; Μονοζωνικό μοντέλο; Πολυζωνικό μοντέλο; Χημική κινητική; Μηχανισμός Καύσης; Εκπομπές ρύπων; Μεταφορά θερμότητας και μάζας; Άκαυστοι Υδρογονάνθρακες; HCCI; Homogeneous charge; Compression ignition engine; Simulation; Single-zone model; Multi-zone model; Chemical kinetics; Combustion mechanism; Pollutant emissions; Heat and mass transfer

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Komninos, N. (2007). Προαναμεμειγμένη καύση κινητήρων ντήζελ. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/28512

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):

Komninos, Neofytos. “Προαναμεμειγμένη καύση κινητήρων ντήζελ.” 2007. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed April 11, 2021. http://hdl.handle.net/10442/hedi/28512.

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

MLA Handbook (7^th Edition):

Komninos, Neofytos. “Προαναμεμειγμένη καύση κινητήρων ντήζελ.” 2007. Web. 11 Apr 2021.

Vancouver:

Komninos N. Προαναμεμειγμένη καύση κινητήρων ντήζελ. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2007. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10442/hedi/28512.

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

Council of Science Editors:

Komninos N. Προαναμεμειγμένη καύση κινητήρων ντήζελ. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2007. Available from: http://hdl.handle.net/10442/hedi/28512

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

ETH Zürich

24. Vandersickel, Annelies. Two approaches to auto-ignition modelling for HCCI applications.

Degree: 2011, ETH Zürich

URL: http://hdl.handle.net/20.500.11850/43686

Subjects/Keywords: ZÜNDUNG + ZÜNDTEMPERATUR + ZÜNDEIGENSCHAFTEN (BRENNSTOFFTECHNOLOGIE); SHOCK WAVES (FLUID DYNAMICS); HOMOGENEOUS CHARGE COMPRESSION IGNITION, HCCI (INTERNAL COMBUSTION ENGINES); COMBUSTION, COMBUSTION RESIDUES (FUEL TECHNOLOGY); AUTO-OXIDATION + SELF-IGNITION + FLAMMABILITY + FLASH POINT (CHEMICAL KINETICS); VERBRENNUNGSKRAFTMASCHINEN (WÄRMEKRAFTMASCHINEN); ANTRIEBE DURCH VERBRENNUNGSMOTOREN (MASCHINENBAU); AUTOOXIDATION + SELBSTZÜNDUNG + ENTFLAMMBARKEIT + FLAMMPUNKT (CHEMISCHE KINETIK); INTERNAL COMBUSTION ENGINES (HEAT ENGINES); STOSSWELLEN + SCHOCKWELLEN (FLUIDDYNAMIK); NUMERISCHE SIMULATION UND MATHEMATISCHE MODELLRECHNUNG; HOMOGENE KOMPRESSIONSZÜNDUNG, HCCI (VERBRENNUNGSMOTOREN); NUMERICAL SIMULATION AND MATHEMATICAL MODELING; VERBRENNUNG, VERBRENNUNGSRÜCKSTÄNDE (BRENNSTOFFTECHNOLOGIE); DRIVES BY COMBUSTION ENGINES (MECHANICAL ENGINEERING); IGNITION PROPERTIES + IGNITION TEMPERATURE (FUEL TECHNOLOGY); info:eu-repo/classification/ddc/620; info:eu-repo/classification/ddc/530; Engineering & allied operations; Physics

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Vandersickel, A. (2011). Two approaches to auto-ignition modelling for HCCI applications. (Doctoral Dissertation). ETH Zürich. Retrieved from http://hdl.handle.net/20.500.11850/43686

Chicago Manual of Style (16^th Edition):

Vandersickel, Annelies. “Two approaches to auto-ignition modelling for HCCI applications.” 2011. Doctoral Dissertation, ETH Zürich. Accessed April 11, 2021. http://hdl.handle.net/20.500.11850/43686.

MLA Handbook (7^th Edition):

Vandersickel, Annelies. “Two approaches to auto-ignition modelling for HCCI applications.” 2011. Web. 11 Apr 2021.

Vancouver:

Vandersickel A. Two approaches to auto-ignition modelling for HCCI applications. [Internet] [Doctoral dissertation]. ETH Zürich; 2011. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/20.500.11850/43686.

Council of Science Editors:

Vandersickel A. Two approaches to auto-ignition modelling for HCCI applications. [Doctoral Dissertation]. ETH Zürich; 2011. Available from: http://hdl.handle.net/20.500.11850/43686

Open Access Theses and Dissertations