subject:(dual fuel combustion)

1. Belaid-Saleh, Haïfa. Etude des régimes de combustion dans le contexte du fonctionnement dual fuel : Investigation of combustion regimes in a dual fuel engine.

Degree: Docteur es, Mécanique et énergétique, 2015, Université d'Orléans

URL: http://www.theses.fr/2015ORLE2064

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Le développement de stratégies de combustion innovantes est nécessaire aujourd’hui pour répondre aux réglementations de plus en plus intransigeantes qui fixent les seuils d’émissions polluantes… (more)

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Le développement de stratégies de combustion innovantes est nécessaire aujourd’hui pour répondre aux réglementations de plus en plus intransigeantes qui fixent les seuils d’émissions polluantes par les véhicules neufs. Parmi ces stratégies, l’approche Dual Fuel a montré un fort potentiel dans la réduction des émissions tout en maintenant des niveaux de rendement élevés. Le concept Dual Fuel est fondé sur la formation d’un mélange homogène d’air et d’un carburant volatile (essence, méthane, éthanol...) allumé par une injection directe d’un carburant à fort cétane (de type gazole) dans la chambre de combustion. Une compréhension détaillée des différents processus de combustion est primordiale pour aider au développement des stratégies Dual Fuel concrètes. Dans ce contexte, le développement d’un modèle adapté, couplé à des mesures expérimentales réalisées sur moteur optique, est indispensable pour optimiser la combustion Dual Fuel. Une étude numérique, fondée sur le couplage d’un modèle de combustion turbulente dédié à la propagation de flamme dans des milieux stratifiés (ECFM3Z) et un modèle de chimie tabulée pour la prédiction de l’auto-inflammation (TKI), a été menée afin d’évaluer la capacité des modèles existants à prédire les différents régimes de combustion qui pourraient exister dans les stratégies Dual Fuel. Des critères de transition ont été ajoutés et évalués afin d’améliorer le couplage des deux modèles et d’assurer la transition entre l’auto-inflammation et la propagation de flamme. D’autre part, l’étude expérimentale sur un moteur à accès optiques a permis d’étudier des variations de richesse, de carburant de prémélange et de taux de dilution et de caractériser de manière fine les mécanismes de la combustion Dual Fuel afin de servir de base de données aux développements de modèles CFD.

Advanced combustion strategies are required in response to increasingly stringent worldwide regulations governing exhaust gas emissions in the transport sector. Among these strategies, the Dual Fuel approach has shown potential to reduce engine-out pollutant emissions without penalizing combustion efficiency. The Dual Fuel concept relies on the formation of a homogeneous mixture of air with a highly volatile fuel (gasoline, methane, ethanol...) which is ignited by direct injection of a high-cetane fuel (Diesel fuel) in the combustion chamber. An improved understanding of the underlying physical phenomena and a detailed insight of the predominant combustion regime(s) are required in order to advance the development of the Dual Fuel combustion strategies. In this context, numerical modeling and optical engine measurements are combined to investigate Dual Fuel combustion. A numerical study, based on the coupling between a turbulent combustion model for flame propagation in stratified mixtures (ECFM3Z) and a tabulated kinetics model for auto-ignition (TKI), was conducted to evaluate the capacity of the existing models to cope with the various combustion regimes that might exist in Duel Fuel combustion strategies. Transition…

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

Subjects/Keywords: Dual Fuel; Régimes de Combustion; Dual Fuel engine; Combustion regimes

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APA (6^th Edition):

Belaid-Saleh, H. (2015). Etude des régimes de combustion dans le contexte du fonctionnement dual fuel : Investigation of combustion regimes in a dual fuel engine. (Doctoral Dissertation). Université d'Orléans. Retrieved from http://www.theses.fr/2015ORLE2064

Chicago Manual of Style (16^th Edition):

Belaid-Saleh, Haïfa. “Etude des régimes de combustion dans le contexte du fonctionnement dual fuel : Investigation of combustion regimes in a dual fuel engine.” 2015. Doctoral Dissertation, Université d'Orléans. Accessed February 27, 2021. http://www.theses.fr/2015ORLE2064.

MLA Handbook (7^th Edition):

Belaid-Saleh, Haïfa. “Etude des régimes de combustion dans le contexte du fonctionnement dual fuel : Investigation of combustion regimes in a dual fuel engine.” 2015. Web. 27 Feb 2021.

Vancouver:

Belaid-Saleh H. Etude des régimes de combustion dans le contexte du fonctionnement dual fuel : Investigation of combustion regimes in a dual fuel engine. [Internet] [Doctoral dissertation]. Université d'Orléans; 2015. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2015ORLE2064.

Council of Science Editors:

Belaid-Saleh H. Etude des régimes de combustion dans le contexte du fonctionnement dual fuel : Investigation of combustion regimes in a dual fuel engine. [Doctoral Dissertation]. Université d'Orléans; 2015. Available from: http://www.theses.fr/2015ORLE2064

Mississippi State University

2. Polk, Andrew C. Detailed characterization of conventional and low temperature dual fuel combustion in compression ignition engines.

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

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04012013-092845/ ;

► The goal of this study is to assess conventional and low temperature dual fuel combustion in light- and heavy-duty multi-cylinder compression ignition engines in… (more)

▼ The goal of this study is to assess conventional and low temperature dual fuel combustion in light- and heavy-duty multi-cylinder compression ignition engines in terms of combustion characterization, performance, and emissions. First, a light-duty compression ignition engine is converted to a dual fuel engine and instrumented for in-cylinder pressure measurements. The primary fuels, methane and propane, are each introduced into the system by means of fumigation before the turbocharger, ensuring the air-fuel composition is well-mixed. Experiments are performed at 2.5, 5, 7.5, and 10 bar BMEP at an engine speed of 1800 RPM. Heat release analyses reveal that the ignition delay and subsequent combustion processes are dependent on the primary fuel type and concentration, pilot quantity, and loading condition. At low load, diesel-ignited propane yields longer ignition delay periods than diesel-ignited methane, while at high load the reactivity of propane is more pronounced, leading to shorter ignition delays. At high load (BMEP = 10 bar), the rapid heat release associated with diesel-ignited propane appears to occur even before pilot injection, possibly indicating auto-ignition of the propane-air mixture. Next, a modern, heavy-duty compression ignition engine is commissioned with an open architecture controller and instrumented for in-cylinder pressure measurements. Initial diesel-ignited propane dual fuel experiments (fumigated before the turbocharger) at 1500 RPM reveal that the maximum percent energy substitution (PES) of propane is limited to 86, 60, 33, and 25 percent at 5, 10, 15, and 20 bar BMEP, respectively. Fueling strategy, injection strategy, exhaust gas recirculation (EGR) rate, and intake boost pressure are varied in order to maximize the PES of propane at 10 bar BMEP, which increases from 60 PES to 80 PES of propane. Finally, diesel-ignited propane dual fuel low temperature combustion (LTC) is implemented using early injection timings (50 DBTDC) at 5 bar BMEP. A sweep of injection timings from 10 DBTDC to 50 DBTDC reveals the transition from conventional to low temperature dual fuel combustion, indicated by ultra-low NO_x and smoke emissions. Optimization of the dual fuel LTC concept yields less than 0.02 g/kW-hr NO_x and 0.06 FSN smoke at 93 PES of propane. Advisors/Committee Members: Sundar R. Krishnan (chair), Kalyan K. Srinivasan (chair), Rogelio Luck (committee member), D. Keith Walters (committee member).

Subjects/Keywords: compression ignition; propane; combustion; dual fuel; LTC

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

APA (6^th Edition):

Polk, A. C. (2013). Detailed characterization of conventional and low temperature dual fuel combustion in compression ignition engines. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04012013-092845/ ;

Chicago Manual of Style (16^th Edition):

Polk, Andrew C. “Detailed characterization of conventional and low temperature dual fuel combustion in compression ignition engines.” 2013. Doctoral Dissertation, Mississippi State University. Accessed February 27, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04012013-092845/ ;.

MLA Handbook (7^th Edition):

Polk, Andrew C. “Detailed characterization of conventional and low temperature dual fuel combustion in compression ignition engines.” 2013. Web. 27 Feb 2021.

Vancouver:

Polk AC. Detailed characterization of conventional and low temperature dual fuel combustion in compression ignition engines. [Internet] [Doctoral dissertation]. Mississippi State University; 2013. [cited 2021 Feb 27]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04012013-092845/ ;.

Council of Science Editors:

Polk AC. Detailed characterization of conventional and low temperature dual fuel combustion in compression ignition engines. [Doctoral Dissertation]. Mississippi State University; 2013. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04012013-092845/ ;

Wayne State University

3. Florea, Radu Catalin. Optical investigation of ethanol and n-heptane dual-fuel partially premixed combution in s reciprocating engine.

Degree: PhD, Mechanical Engineering, 2012, Wayne State University

URL: https://digitalcommons.wayne.edu/oa_dissertations/491

► The details of the dual-fuel combustion of n-heptane and ethanol were investigated in an optically accessible engine representative of light-duty applications. Experimental work involved… (more)

Subjects/Keywords: combustion, dual-fuel combustion, optical diagnostics; Mechanical Engineering

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

APA (6^th Edition):

Florea, R. C. (2012). Optical investigation of ethanol and n-heptane dual-fuel partially premixed combution in s reciprocating engine. (Doctoral Dissertation). Wayne State University. Retrieved from https://digitalcommons.wayne.edu/oa_dissertations/491

Chicago Manual of Style (16^th Edition):

Florea, Radu Catalin. “Optical investigation of ethanol and n-heptane dual-fuel partially premixed combution in s reciprocating engine.” 2012. Doctoral Dissertation, Wayne State University. Accessed February 27, 2021. https://digitalcommons.wayne.edu/oa_dissertations/491.

MLA Handbook (7^th Edition):

Florea, Radu Catalin. “Optical investigation of ethanol and n-heptane dual-fuel partially premixed combution in s reciprocating engine.” 2012. Web. 27 Feb 2021.

Vancouver:

Florea RC. Optical investigation of ethanol and n-heptane dual-fuel partially premixed combution in s reciprocating engine. [Internet] [Doctoral dissertation]. Wayne State University; 2012. [cited 2021 Feb 27]. Available from: https://digitalcommons.wayne.edu/oa_dissertations/491.

Council of Science Editors:

Florea RC. Optical investigation of ethanol and n-heptane dual-fuel partially premixed combution in s reciprocating engine. [Doctoral Dissertation]. Wayne State University; 2012. Available from: https://digitalcommons.wayne.edu/oa_dissertations/491

Loughborough University

4. Petrakides, Sotiris. On the combustion of premixed natural gas/gasoline dual fuel blends in SI engines.

Degree: PhD, 2016, Loughborough University

URL: http://hdl.handle.net/2134/23547

► The continuous update of challenging emission legislations has renewed the interest for the use of alternative fuels. The low carbon content, the knocking resistance, and… (more)

▼ The continuous update of challenging emission legislations has renewed the interest for the use of alternative fuels. The low carbon content, the knocking resistance, and the abundance reserves, have classified natural gas as one of the most promising alternative fuels. The major constituent of natural gas is methane. Historically, the slow burning velocity of methane has been a major concern for its utilisation in energy efficient combustion applications. As emphasized in a limited body of experimental literature, a binary blend of methane and gasoline has the potential to accelerate the combustion process in an SI engine, resulting in a faster combustion even to that of gasoline. The mechanism of such effects remains unclear. This is partially owned to the inadequate prior scientific understanding of the fundamental combustion parameters, laminar burning velocity (Su0) and Markstein length (Lb), of a gasoline-natural gas Dual Fuel (DF) blend. The value of Lb characterises the sensitivity of the flame to stretch. The flame stretch is induced by aerodynamic straining and/or flame curvature. The current research study has therefore being concerned on understanding the combustion mechanism of premixed gasoline - natural gas DF blends both on a fundamental as well as practical SI engine level. The understanding on the contribution of Su0 and Lb to the velocity of a stretched laminar propagating flame has been extended through numerical analysis. A conceptual analysis of the laminar as compared to the SI engine combustion allowed further insights on the effect of turbulence to the mass burning rate of the base fuels. On a fundamental level, the research contribution is made through the quantification of the response of Su0 and Lb with the ratio of methane to PRF95 (95%volliq iso-octane and 5%volliq n-heptane) in a DF blend. Methane has been used as a surrogate for natural gas and PRF95 as a surrogate for gasoline. Constant volume laminar combustion experiments have been conducted in a cylindrical vessel at equivalence ratios of 0.8, 1, 1.2, initial pressures of 2.5, 5, 10 Bar, and a constant temperature of 373 K. Methane was added to PRF95 in three different energy ratios 25%, 50% and 75%. Spherically expanding flames visualised through schlieren photography were used to derive the values of Lb and Su0. It has been concluded that for pressures relevant to SI engine operation ( > 5bar) and stoichiometric to lean Air Fuel Ratios (AFRs), there is a positive synergy for blending methane to PRF95 due to the convergence of Lb of the blended fuel towards that of pure gas and Su0 towards that of pure liquid. In an SI engine environment, the research contribution is made through the characterisation and scientific understanding of the mechanism of DF combustion, and the importance of flame-stretch interactions at various engine operating conditions. Optical diagnostics have been integrated with in-cylinder pressure analysis to investigate the mechanism of flame velocity and stability with the addition of natural gas to gasoline…

Subjects/Keywords: 621.43; Combustion; SI engines; Markstein length; Natural gas; Gasoline; Dual fuel

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

APA (6^th Edition):

Petrakides, S. (2016). On the combustion of premixed natural gas/gasoline dual fuel blends in SI engines. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/23547

Chicago Manual of Style (16^th Edition):

Petrakides, Sotiris. “On the combustion of premixed natural gas/gasoline dual fuel blends in SI engines.” 2016. Doctoral Dissertation, Loughborough University. Accessed February 27, 2021. http://hdl.handle.net/2134/23547.

MLA Handbook (7^th Edition):

Petrakides, Sotiris. “On the combustion of premixed natural gas/gasoline dual fuel blends in SI engines.” 2016. Web. 27 Feb 2021.

Vancouver:

Petrakides S. On the combustion of premixed natural gas/gasoline dual fuel blends in SI engines. [Internet] [Doctoral dissertation]. Loughborough University; 2016. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2134/23547.

Council of Science Editors:

Petrakides S. On the combustion of premixed natural gas/gasoline dual fuel blends in SI engines. [Doctoral Dissertation]. Loughborough University; 2016. Available from: http://hdl.handle.net/2134/23547

Penn State University

5. Prabhakar, Bhaskar. Examination of Egr Cooler Fouling and Engine Efficiency Improvement in Compression Ignition Engines.

Degree: 2013, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/18054

► The scope of this investigation is to understand the challenges associated with achieving high engine efficiency and low emissions in ‘Clean Diesel’ technology. The topics… (more)

▼ The scope of this investigation is to understand the challenges associated with achieving high engine efficiency and low emissions in ‘Clean Diesel’ technology. The topics addressed in this study are: 1) understanding the challenges in reducing NOx emissions due to fouling of EGR coolers, 2) exploring high efficiency dual fuel combustion with fumigation of liquefied gases into engine air intake, and 3) understanding the effect of diesel fuel formulation on engine efficiency and emissions. In the first study, the performance of a model EGR cooler attached to a 6.4L turbodiesel engine was investigated by analyzing the microstructure and chemical composition of the deposits on the fouled heat exchanger surfaces at two engine loads: medium and low, and at two coolant temperatures: 85°C and 40°C. Results indicated that the medium load condition resulted in greater thermal effectiveness loss and mass gain inside the EGR cooler, mostly due to increased thermophoresis, producing smaller (grain size) and coarser deposits. In contrast, the low load condition resulted in lower effectiveness loss, but produced large-sized deposits mostly due to increased hydrocarbon (HC) condensation. Regardless of the engine load, effectiveness and deposit mass gain plateaued in about 9 hours. Coolant temperature played a significant role in altering the deposit microstructure and in increasing the amount of condensed HCs. Deposit mass increased for the 40°C coolant condition due to an increase in both HC condensation and thermophoresis. For most conditions, the deposits were comprised of some aromatics and mostly heavy aliphatics (C17-C25 paraffins) which arise due to incomplete combustion of the heavy-end long chain compounds present in the fuel and lubricating oil. Low coolant temperatures promoted higher effectiveness recovery during engine start-up suggesting an influence of condensed water vapor on deposit layer removal. Use of an oxidation catalyst upstream of the EGR cooler to reduce hydrocarbon condensation was not effective at the engine conditions tested in the study due to low operating temperatures across the catalyst. In the second study, the role of ignition quality of a fumigated fuel on combustion phasing and brake thermal efficiency (BTE) was investigated on a 2.5L turbocharged common rail light-duty diesel engine, in a process similar to dual fuel combustion. Different combinations of DME and propane were fumigated into the intake air via a specially designed manifold assembly, each combination representing a percentage of the energy supplied to the engine, with rest of the fuel being ultra-low sulfur diesel (ULSD). Fumigation of DME and propane significantly increased BTE and reduced brake specific energy consumption (BSEC) compared to the baseline diesel condition with no fumigation. A mixture of 20% DME with 30% propane provided the maximum BTE, with 24% reduction in BSEC, however, at the expense of increasing peak cylinder pressure by 6 bar, which was even higher at greater DME%. Fumigated DME auto-ignited early, ahead… Advisors/Committee Members: Andre Louis Boehman, Dissertation Advisor/Co-Advisor, Randy Lee Vander Wal, Committee Chair/Co-Chair, Jonathan P Mathews, Committee Member, Daniel Connell Haworth, Special Member.

Subjects/Keywords: EGR Cooler Fouling; High Efficiency Combustion; Dual Fuel Combustion; Clean Diesel Technology

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

APA (6^th Edition):

Prabhakar, B. (2013). Examination of Egr Cooler Fouling and Engine Efficiency Improvement in Compression Ignition Engines. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/18054

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):

Prabhakar, Bhaskar. “Examination of Egr Cooler Fouling and Engine Efficiency Improvement in Compression Ignition Engines.” 2013. Thesis, Penn State University. Accessed February 27, 2021. https://submit-etda.libraries.psu.edu/catalog/18054.

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

MLA Handbook (7^th Edition):

Prabhakar, Bhaskar. “Examination of Egr Cooler Fouling and Engine Efficiency Improvement in Compression Ignition Engines.” 2013. Web. 27 Feb 2021.

Vancouver:

Prabhakar B. Examination of Egr Cooler Fouling and Engine Efficiency Improvement in Compression Ignition Engines. [Internet] [Thesis]. Penn State University; 2013. [cited 2021 Feb 27]. Available from: https://submit-etda.libraries.psu.edu/catalog/18054.

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

Council of Science Editors:

Prabhakar B. Examination of Egr Cooler Fouling and Engine Efficiency Improvement in Compression Ignition Engines. [Thesis]. Penn State University; 2013. Available from: https://submit-etda.libraries.psu.edu/catalog/18054

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

University of Windsor

6. Divekar, Prasad Sajjan. CLEAN COMBUSTION CONTROL IN A COMPRESSION IGNITION ENGINE.

Degree: PhD, Mechanical, Automotive, and Materials Engineering, 2016, University of Windsor

URL: https://scholar.uwindsor.ca/etd/5813

► The primary objective of this dissertation is to develop combustion control strategies, that can reduce the thermal efficiency penalty associated with clean combustion in modern… (more)

Subjects/Keywords: Clean combustion; Dual-fuel; Dynamic combustion control; Emissions versus efficiency; Ethanol; Exhaust gas recirculation

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APA (6^th Edition):

Divekar, P. S. (2016). CLEAN COMBUSTION CONTROL IN A COMPRESSION IGNITION ENGINE. (Doctoral Dissertation). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5813

Chicago Manual of Style (16^th Edition):

Divekar, Prasad Sajjan. “CLEAN COMBUSTION CONTROL IN A COMPRESSION IGNITION ENGINE.” 2016. Doctoral Dissertation, University of Windsor. Accessed February 27, 2021. https://scholar.uwindsor.ca/etd/5813.

MLA Handbook (7^th Edition):

Divekar, Prasad Sajjan. “CLEAN COMBUSTION CONTROL IN A COMPRESSION IGNITION ENGINE.” 2016. Web. 27 Feb 2021.

Vancouver:

Divekar PS. CLEAN COMBUSTION CONTROL IN A COMPRESSION IGNITION ENGINE. [Internet] [Doctoral dissertation]. University of Windsor; 2016. [cited 2021 Feb 27]. Available from: https://scholar.uwindsor.ca/etd/5813.

Council of Science Editors:

Divekar PS. CLEAN COMBUSTION CONTROL IN A COMPRESSION IGNITION ENGINE. [Doctoral Dissertation]. University of Windsor; 2016. Available from: https://scholar.uwindsor.ca/etd/5813

7. Aklouche, Fatma Zohra. Etude caractéristique et développement de la combustion des moteurs Diesel en mode Dual-Fuel : optimisation de l'injection du combustible pilote : Characteristic study and development of combustion of Diesel engine operating in Dual-Fuel mode : Optimization of pilot fuel injection.

Degree: Docteur es, Energétique, thermique et combustion, 2018, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire

URL: http://www.theses.fr/2018IMTA0072

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La dégradation de l’environnement ainsi que l’épuisement progressif des énergies fossiles devient très inquiétant et incite les états à définir des limites d’émission polluantes plus… (more)

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La dégradation de l’environnement ainsi que l’épuisement progressif des énergies fossiles devient très inquiétant et incite les états à définir des limites d’émission polluantes plus strictes. Ceci a conduit les constructeurs automobiles à poursuivre leurs recherches dans le développement de conception propre et efficace des moteurs en utilisant des combustibles alternatifs dans les moteurs à combustion interne.Dans le présent travail, on s’intéresse à l’étude des moteurs fonctionnant en mode DF afin d’améliorer ses performances tout en minimisant les émissions polluantes, en particulier les HC et les CO. Pour ce faire des études expérimentales ont été menées. Une réduction de 77% des émissions de HC a été observée en passant d’une richesse de 0,35 à 0,7. Par ailleurs, Il a été noté aussi qu’une diminution de 20% à 50% des émissions de CO avec une amélioration de 30% du rendement peut être visualisée en variant l’avance à l’injection de 4,5 °V à 6 °V. Concernant la mise en place de la pré-injection, une baisse de 30% des émissions de NOx a été observée avec un gain de 12% à 30% de rendement par rapport à une seule injection. En dernier terme, un modèle thermodynamique à une zone a été développé afin de prédire la température et la pression dans le cylindre. Une bonne concordance a été notée entre les deux résultats avec une erreur moyenne relative inférieure à 5%.

Currently, the environmental degradation due to pollutant emissions and the gradual depletion of fossil fuels, becoming very worrying, are prompting European directives to set pollutant emission limits. These have led manufacturers to continue research in the development of clean and efficient engine designs using alternative fuels in internal combustion engines.In this work, we focus on the study of engines operating in dual-fuel mode to improve its performance while minimizing pollutant emissions, particularly HC and CO. For this, experimental studies were conducted. A reduction of about 77% in the HC emissions was observed as the equivalence ratio was varied from 0.35 to 0.7. Regarding the effect of injection timing, it was noted that the CO emissions decreased about 20% to 50% with an improvement in the brake thermal efficiency by 30% upon varying the injection advance from 4,5 °CA to 6 °CA. On the other hand, the introduction of pre-injection strategy led to a decrease by 30% in NOx emissions with an amelioration of brake thermal efficiency of 12% to 30% compared to a single injection. Lastly, a single zone thermodynamic model was developed to predict the in-cylinder temperature and pressure. A good agreement was noted between the predicted and experimental results. The average relative error was less than 5%.

Advisors/Committee Members: Loubar, Khaled (thesis director), Bentebbiche, Abdelhalim (thesis director).

Subjects/Keywords: Moteur Dual-Fuel; Combustion et performance; Biogaz; Gaz naturel; Émissions; Délai d’auto-Inflammation; Dual-Fuel engine; Combustion and performance; Biogas; Natural gas; Pollutant emissions; Ignition delay; 620

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APA (6^th Edition):

Aklouche, F. Z. (2018). Etude caractéristique et développement de la combustion des moteurs Diesel en mode Dual-Fuel : optimisation de l'injection du combustible pilote : Characteristic study and development of combustion of Diesel engine operating in Dual-Fuel mode : Optimization of pilot fuel injection. (Doctoral Dissertation). Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire. Retrieved from http://www.theses.fr/2018IMTA0072

Chicago Manual of Style (16^th Edition):

Aklouche, Fatma Zohra. “Etude caractéristique et développement de la combustion des moteurs Diesel en mode Dual-Fuel : optimisation de l'injection du combustible pilote : Characteristic study and development of combustion of Diesel engine operating in Dual-Fuel mode : Optimization of pilot fuel injection.” 2018. Doctoral Dissertation, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire. Accessed February 27, 2021. http://www.theses.fr/2018IMTA0072.

MLA Handbook (7^th Edition):

Aklouche, Fatma Zohra. “Etude caractéristique et développement de la combustion des moteurs Diesel en mode Dual-Fuel : optimisation de l'injection du combustible pilote : Characteristic study and development of combustion of Diesel engine operating in Dual-Fuel mode : Optimization of pilot fuel injection.” 2018. Web. 27 Feb 2021.

Vancouver:

Aklouche FZ. Etude caractéristique et développement de la combustion des moteurs Diesel en mode Dual-Fuel : optimisation de l'injection du combustible pilote : Characteristic study and development of combustion of Diesel engine operating in Dual-Fuel mode : Optimization of pilot fuel injection. [Internet] [Doctoral dissertation]. Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire; 2018. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2018IMTA0072.

Council of Science Editors:

Aklouche FZ. Etude caractéristique et développement de la combustion des moteurs Diesel en mode Dual-Fuel : optimisation de l'injection du combustible pilote : Characteristic study and development of combustion of Diesel engine operating in Dual-Fuel mode : Optimization of pilot fuel injection. [Doctoral Dissertation]. Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire; 2018. Available from: http://www.theses.fr/2018IMTA0072

Penn State University

8. Jayaraman, Srinivas. Performance Optimization of a Diesel Engine for Dual Fuel Combustion.

Degree: 2012, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/15338

► With recent emphasis on clean fuel and environmental sustainability, it has become increasingly important to look into methods of reducing fuel consumption and emissions while… (more)

▼ With recent emphasis on clean fuel and environmental sustainability, it has become increasingly important to look into methods of reducing fuel consumption and emissions while simultaneously maintaining the level of engine performance. Through this study an attempt has been made to observe the effects of using fumigated fuels and an injection of diesel on the performance of an engine and subsequent emissions. The performance of the engine will be judged primarily on brake specific fuel consumption (BSFC), brake specific energy consumption (BSEC), brake thermal efficiency (BTE), peak cylinder pressure and the apparent heat release rate, while total hydrocarbon content (THC), nitrogen oxides (NOx), carbon dioxide (CO2) and carbon monoxide (CO) were considered to analyze the emissions. The data collected was statistically analyzed to determine which factors are most significant in determining the engine’s performance. Exhaust gas recirculation was also used to observe its effects on the above outcomes. The engine used to conduct the tests is a DDC/VM-Motori 2.5L, 4 cylinder, turbocharged, direct injection, light duty diesel engine. The fuels to be fumigated in the cylinder are dimethyl ether (DME) and propane, and the injection is of ultra-low sulphur diesel (ULSD). Previous studies have shown that DME, which has a low boiling point and high cetane number, tends to advance the ignition point by increasing the low temperature heat release. Methane has also been used in the past along with DME to delay the heat release, provide for a more controlled reaction as well as reduce NOx emissions. This study attempts to achieve the same effects using propane instead of methane along with DME. The concentrations of DME and propane in the fumigated fuel were varied over a span of 0 to 60% energy equivalent of the total fuel requirement. The experiments were conducted in two sets, the first set of experiments utilized just DME as the fumigated fuel in the cylinder along with an injection of ULSD. In the second set of experiments, propane was added to the DME to be fumigated in the cylinder. Previous studies have shown favorable trends in the values of BSFC and BSEC due to the addition of a fumigated fuel (usually natural gas) along with an injection of diesel. Similar results were observed for the addition of DME and propane as the fumigated fuels along with diesel along with an increase in BTE. It was observed that the heat release was advanced with increasing energy substitution. There was also an increase in the peak cylinder pressure with increasing fumigation as compared to baseline diesel. Reduction in NOx emissions was observed which further reduced with EGR introduction. THC emissions on the other hand increased with increasing substitution. On completion of the experiments, a statistical analysis was performed to determine the factors which had the most influence on the performance of the engine. The tests were treated as a General Full Factorial Experimental Design and an analysis of variance (ANOVA) was performed to… Advisors/Committee Members: Andre Louis Boehman, Thesis Advisor/Co-Advisor.

Subjects/Keywords: Dual Fuel Combustion; RCCI; HCCI; Diesel engine; Dimethyl ether (DME); propane; optimization; emissions; performance

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APA (6^th Edition):

Jayaraman, S. (2012). Performance Optimization of a Diesel Engine for Dual Fuel Combustion. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/15338

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):

Jayaraman, Srinivas. “Performance Optimization of a Diesel Engine for Dual Fuel Combustion.” 2012. Thesis, Penn State University. Accessed February 27, 2021. https://submit-etda.libraries.psu.edu/catalog/15338.

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

MLA Handbook (7^th Edition):

Jayaraman, Srinivas. “Performance Optimization of a Diesel Engine for Dual Fuel Combustion.” 2012. Web. 27 Feb 2021.

Vancouver:

Jayaraman S. Performance Optimization of a Diesel Engine for Dual Fuel Combustion. [Internet] [Thesis]. Penn State University; 2012. [cited 2021 Feb 27]. Available from: https://submit-etda.libraries.psu.edu/catalog/15338.

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

Council of Science Editors:

Jayaraman S. Performance Optimization of a Diesel Engine for Dual Fuel Combustion. [Thesis]. Penn State University; 2012. Available from: https://submit-etda.libraries.psu.edu/catalog/15338

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

University of Bradford

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

Degree: PhD, 2013, University of Bradford

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

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

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

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

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APA (6^th Edition):

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

Chicago Manual of Style (16^th Edition):

Ghomashi, Hossein. “Modelling the combustion in a dual fuel HCCI engine : investigation of knock, compression ratio, equivalence ratio and timing in a Homogeneous Charge Compression Ignition (HCCI) engine with natural gas and diesel fuels using modelling and simulation.” 2013. Doctoral Dissertation, University of Bradford. Accessed February 27, 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. 27 Feb 2021.

Vancouver:

Ghomashi H. Modelling the combustion in a dual fuel HCCI engine : investigation of knock, compression ratio, equivalence ratio and timing in a Homogeneous Charge Compression Ignition (HCCI) engine with natural gas and diesel fuels using modelling and simulation. [Internet] [Doctoral dissertation]. University of Bradford; 2013. [cited 2021 Feb 27]. 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

10. Van Roekel, Chris. Evaluation of ethanol substitution in a compression ignition engine.

Degree: MS(M.S.), Mechanical Engineering, 2017, Colorado State University

URL: http://hdl.handle.net/10217/181449

► Heavy duty compression ignition engines rely on advanced emission control strategies to mitigate regulated emissions in compliance with requirements set by the Environmental Protection Agency.… (more)

▼ Heavy duty compression ignition engines rely on advanced emission control strategies to mitigate regulated emissions in compliance with requirements set by the Environmental Protection Agency. These strategies add significant cost and complexity to engine design. Previous work identified that a diesel-ethanol dual fuel combustion technique may be able to reduce diesel fuel consumption and supplement current emission control methods. The substitution of diesel fuel with a renewable, U.S. based fuel such as corn ethanol would also improve US energy security. A review of diesel-ethanol dual fuel combustion identified five possible methods of diesel-ethanol dual fuel combustion. They were ethanol-diesel emulsions, ethanol-diesel-additive blending, twin direct injection of ethanol and diesel, ethanol fumigation of intake air with standard diesel fuel injection, and full substitution of diesel with ethanol. Analysis of ethanol-diesel emulsions and ethanol-diesel-additive blending concluded that only low volumes of ethanol (<10%) could be blended in diesel fuel before the two fuels were immiscible. However, analysis using ternary phase diagrams showed that additives such as B100 biodiesel could be used to extend the substitution limit significantly such that at 25°C mixtures of 80% 200 proof ethanol, 10% B100 biodiesel, and 10% off-road diesel were visibly miscible. Miscible mixtures containing high volumes of ethanol underwent further analysis, which showed that these fuels were not suitable drop in replacements for diesel fuel due to poor cold flow properties. Based on fuel blending analysis and previously published literature ethanol fumigation of intake air was selected for an on-engine demonstration using a Cummins 6.7L QSB Tier 4 Final engine. Three ethanol based fuels were selected for this dual fuel combustion work: 200 proof ethanol, 190 proof ethanol, and a blend of 15% E0 gasoline and 85% 200 proof ethanol. Pre and post aftertreatment emission data and high speed combustion data were collected while operating the engine at ISO 8178 test points C1-7, C1-3, and C2-4. The maximum diesel substitution at each test point was similar among the three test fuels. and at moderate to high engine loads diesel substitution was limited to 25% and 39%, respectively due to engine knock . At low engine loads substitution was limited to 25% by exhaust emission requirements. Premixed ethanol combustion increased brake specific efficiency at moderate and high engine loads by 3% and 3.2%, respectively, but reduced efficiency at low engine loads by 1.4%. Finally, although the complete ISO 8178 test map was not completed the Tier 4 Final after treatment system was able to reduce ethanol premixed combustion emissions to at or below the diesel baseline emissions at nearly every test point. Advisors/Committee Members: Olsen, Daniel B. (advisor), Bandhauer, Todd (committee member), Reardon, Ken (committee member).

Subjects/Keywords: diesel; ethanol; dual fuel; combustion

…combustion of ethanol fuel, a diesel-ethanol dual fuel combustion approach may be a viable method… …Five methods of diesel-ethanol dual fuel combustion were identified during the literature… …24 Table 6. Dual Fuel Injector Flow Rates… …34 Table 9. CA10 and CA50 Dual Fuel Comparisons… …26 Figure 24. Dual Fuel Injection System…

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APA (6^th Edition):

Van Roekel, C. (2017). Evaluation of ethanol substitution in a compression ignition engine. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/181449

Chicago Manual of Style (16^th Edition):

Van Roekel, Chris. “Evaluation of ethanol substitution in a compression ignition engine.” 2017. Masters Thesis, Colorado State University. Accessed February 27, 2021. http://hdl.handle.net/10217/181449.

MLA Handbook (7^th Edition):

Van Roekel, Chris. “Evaluation of ethanol substitution in a compression ignition engine.” 2017. Web. 27 Feb 2021.

Vancouver:

Van Roekel C. Evaluation of ethanol substitution in a compression ignition engine. [Internet] [Masters thesis]. Colorado State University; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10217/181449.

Council of Science Editors:

Van Roekel C. Evaluation of ethanol substitution in a compression ignition engine. [Masters Thesis]. Colorado State University; 2017. Available from: http://hdl.handle.net/10217/181449

University of Michigan

11. Martin, Jonathan. Exploring the Combustion Modes of A Dual-Fuel Compression Ignition Engine.

Degree: PhD, Mechanical Engineering, 2019, University of Michigan

URL: http://hdl.handle.net/2027.42/153383

► Compression-ignition (CI) engines, also known as “diesel” engines, can produce higher thermal efficiency (TE) than spark-ignition (SI) engines, which allows them to emit less carbon… (more)

▼ Compression-ignition (CI) engines, also known as “diesel” engines, can produce higher thermal efficiency (TE) than spark-ignition (SI) engines, which allows them to emit less carbon dioxide (CO2) per unit of energy generated. Unfortunately, in practice the TE of CI engines is limited by the need to maintain sufficiently low emissions of nitrogen oxides (NOx) and soot. This problem can be mitigated by operating CI engines in dual-fuel modes with port fuel injection (PFI) of gasoline supplementing the direct injection (DI) of diesel fuel. Several strategies for doing this have been introduced in recent years, but these operating modes are usually studied individually at discrete conditions. This thesis introduces a classification system for dual-fuel CI modes that links together several previously studied modes across a continuous two-dimensional diagram. The combustion modes covered by this system include the standard modes of conventional diesel combustion (CDC) and conventional dual-fuel (CDF); the well-explored advanced combustion modes of HCCI, RCCI, PCCI, and PPCI; and a relatively unexplored combustion mode that is herein titled “Piston-split Dual-Fuel Combustion” or PDFC. The results show that dual-fuel CI engines can simultaneously increase TE and lower NOx and/or soot emissions at high loads through the use of Partial HCCI (PHCCI), despite an increase in emissions of carbon monoxide (CO) and unburnt hydrocarbons (UHC). At low loads, PHCCI is not possible, but either PDFC or RCCI can be used to further improve NOx and/or soot emissions, albeit at slightly lower TE and still higher emissions of CO and UHC. This multi-mode strategy of PHCCI at high loads and PDFC or RCCI at low loads is particularly useful when low engine-out NOx emissions are required. Advisors/Committee Members: Boehman, Andre L (committee member), Lastoskie, Christian M (committee member), Lavoie, George A (committee member), Middleton, Robert John (committee member), Wooldridge, Margaret S (committee member).

Subjects/Keywords: compression-ignition engines; dual-fuel combustion; advanced combustion modes; RCCI; HCCI; thermal efficiency; Mechanical Engineering; Engineering

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APA (6^th Edition):

Martin, J. (2019). Exploring the Combustion Modes of A Dual-Fuel Compression Ignition Engine. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/153383

Chicago Manual of Style (16^th Edition):

Martin, Jonathan. “Exploring the Combustion Modes of A Dual-Fuel Compression Ignition Engine.” 2019. Doctoral Dissertation, University of Michigan. Accessed February 27, 2021. http://hdl.handle.net/2027.42/153383.

MLA Handbook (7^th Edition):

Martin, Jonathan. “Exploring the Combustion Modes of A Dual-Fuel Compression Ignition Engine.” 2019. Web. 27 Feb 2021.

Vancouver:

Martin J. Exploring the Combustion Modes of A Dual-Fuel Compression Ignition Engine. [Internet] [Doctoral dissertation]. University of Michigan; 2019. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2027.42/153383.

Council of Science Editors:

Martin J. Exploring the Combustion Modes of A Dual-Fuel Compression Ignition Engine. [Doctoral Dissertation]. University of Michigan; 2019. Available from: http://hdl.handle.net/2027.42/153383

Michigan Technological University

12. Bonfochi Vinhaes, Vinicius. COMBUSTION DEVELOPMENT OF A HIGH EFFICIENCY DIESEL MICRO PILOT NATURAL GAS ENGINE.

Degree: MS, Department of Mechanical Engineering-Engineering Mechanics, 2018, Michigan Technological University

URL: https://digitalcommons.mtu.edu/etdr/713

► Dual fuel engine operation with premixed natural gas as the main fuel and diesel pilot ignition has been gaining interest among research and industry… (more)

Subjects/Keywords: Dual Fuel; Combustion; Micro Pilot; Natural Gas; Diesel; High efficiency; Energy Systems; Heat Transfer, Combustion; Other Mechanical Engineering

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APA (6^th Edition):

Bonfochi Vinhaes, V. (2018). COMBUSTION DEVELOPMENT OF A HIGH EFFICIENCY DIESEL MICRO PILOT NATURAL GAS ENGINE. (Masters Thesis). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/713

Chicago Manual of Style (16^th Edition):

Bonfochi Vinhaes, Vinicius. “COMBUSTION DEVELOPMENT OF A HIGH EFFICIENCY DIESEL MICRO PILOT NATURAL GAS ENGINE.” 2018. Masters Thesis, Michigan Technological University. Accessed February 27, 2021. https://digitalcommons.mtu.edu/etdr/713.

MLA Handbook (7^th Edition):

Bonfochi Vinhaes, Vinicius. “COMBUSTION DEVELOPMENT OF A HIGH EFFICIENCY DIESEL MICRO PILOT NATURAL GAS ENGINE.” 2018. Web. 27 Feb 2021.

Vancouver:

Bonfochi Vinhaes V. COMBUSTION DEVELOPMENT OF A HIGH EFFICIENCY DIESEL MICRO PILOT NATURAL GAS ENGINE. [Internet] [Masters thesis]. Michigan Technological University; 2018. [cited 2021 Feb 27]. Available from: https://digitalcommons.mtu.edu/etdr/713.

Council of Science Editors:

Bonfochi Vinhaes V. COMBUSTION DEVELOPMENT OF A HIGH EFFICIENCY DIESEL MICRO PILOT NATURAL GAS ENGINE. [Masters Thesis]. Michigan Technological University; 2018. Available from: https://digitalcommons.mtu.edu/etdr/713

Iowa State University

13. Reiter, Aaron. Combustion and emissions characteristics of a compression-ignition engine using dual ammonia-diesel fuel.

Degree: 2009, Iowa State University

URL: https://lib.dr.iastate.edu/etd/10560

► This study investigated the performance of a compression-ignition engine using a dual-fuel approach with ammonia and diesel fuel. With the world's increasing need for alternative… (more)

Subjects/Keywords: ammonia; biodiesel; combustion; diesel; dual-fuel; nh3; Mechanical Engineering

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APA (6^th Edition):

Reiter, A. (2009). Combustion and emissions characteristics of a compression-ignition engine using dual ammonia-diesel fuel. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/10560

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):

Reiter, Aaron. “Combustion and emissions characteristics of a compression-ignition engine using dual ammonia-diesel fuel.” 2009. Thesis, Iowa State University. Accessed February 27, 2021. https://lib.dr.iastate.edu/etd/10560.

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

MLA Handbook (7^th Edition):

Reiter, Aaron. “Combustion and emissions characteristics of a compression-ignition engine using dual ammonia-diesel fuel.” 2009. Web. 27 Feb 2021.

Vancouver:

Reiter A. Combustion and emissions characteristics of a compression-ignition engine using dual ammonia-diesel fuel. [Internet] [Thesis]. Iowa State University; 2009. [cited 2021 Feb 27]. Available from: https://lib.dr.iastate.edu/etd/10560.

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

Council of Science Editors:

Reiter A. Combustion and emissions characteristics of a compression-ignition engine using dual ammonia-diesel fuel. [Thesis]. Iowa State University; 2009. Available from: https://lib.dr.iastate.edu/etd/10560

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

Loughborough University

14. Johnson, Stephen. A quasi-dimensional model for performance and emissions predictions in a dual fuel engine.

Degree: PhD, 2012, Loughborough University

URL: http://hdl.handle.net/2134/10975

► A new quasi-dimensional, multi-zone model has been developed to describe the combustion processes occurring inside a dual fuel engine. A dual fuel engine is a… (more)

Subjects/Keywords: 621.402; Dual fuel; Quasi-dimensional; Multi-zone; Combustion; Modelling; Modeling; Packet model; Turbulent entrainment model; Methane

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APA (6^th Edition):

Johnson, S. (2012). A quasi-dimensional model for performance and emissions predictions in a dual fuel engine. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/10975

Chicago Manual of Style (16^th Edition):

Johnson, Stephen. “A quasi-dimensional model for performance and emissions predictions in a dual fuel engine.” 2012. Doctoral Dissertation, Loughborough University. Accessed February 27, 2021. http://hdl.handle.net/2134/10975.

MLA Handbook (7^th Edition):

Johnson, Stephen. “A quasi-dimensional model for performance and emissions predictions in a dual fuel engine.” 2012. Web. 27 Feb 2021.

Vancouver:

Johnson S. A quasi-dimensional model for performance and emissions predictions in a dual fuel engine. [Internet] [Doctoral dissertation]. Loughborough University; 2012. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2134/10975.

Council of Science Editors:

Johnson S. A quasi-dimensional model for performance and emissions predictions in a dual fuel engine. [Doctoral Dissertation]. Loughborough University; 2012. Available from: http://hdl.handle.net/2134/10975

15. Monsalve Serrano, Javier. Dual-fuel compression ignition: towards clean, highly efficient combustion .

Degree: 2016, Universitat Politècnica de València

URL: http://hdl.handle.net/10251/75109

► The more and more stringent emissions regulations, together with the greater fuel economy demanded by vehicle users, impose a clear objective to researchers and engine… (more)

Subjects/Keywords: Motor; Eficiencia; Combustión; Emisiones; Contaminantes; Dual-fuel; Diesel; Etanol; Gasolina; Biocombustibles; EURO VI; Engine; Efficiency; Combustion; Emissions; Pollutants; Ethanol; Gasoline; Biofuels

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APA (6^th Edition):

Monsalve Serrano, J. (2016). Dual-fuel compression ignition: towards clean, highly efficient combustion . (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/75109

Chicago Manual of Style (16^th Edition):

Monsalve Serrano, Javier. “Dual-fuel compression ignition: towards clean, highly efficient combustion .” 2016. Doctoral Dissertation, Universitat Politècnica de València. Accessed February 27, 2021. http://hdl.handle.net/10251/75109.

MLA Handbook (7^th Edition):

Monsalve Serrano, Javier. “Dual-fuel compression ignition: towards clean, highly efficient combustion .” 2016. Web. 27 Feb 2021.

Vancouver:

Monsalve Serrano J. Dual-fuel compression ignition: towards clean, highly efficient combustion . [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2016. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10251/75109.

Council of Science Editors:

Monsalve Serrano J. Dual-fuel compression ignition: towards clean, highly efficient combustion . [Doctoral Dissertation]. Universitat Politècnica de València; 2016. Available from: http://hdl.handle.net/10251/75109

Michigan Technological University

16. Gorthy, Satyavenkata Naga Sai Sharath. SIMULATION STUDY ON EFFECT OF GAS CHARGING AND EGR IN A DUAL-FUEL ENGINE.

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

URL: https://digitalcommons.mtu.edu/etdr/429

► Natural gas combined with diesel as micro pilot has the capabilities of achieving lower NOx and soot emissions. Optimization of the combustion process in… (more)

▼ Natural gas combined with diesel as micro pilot has the capabilities of achieving lower NOx and soot emissions. Optimization of the combustion process in engines with natural gas and diesel micro-pilot is essential to achieve higher efficiencies and loads. Gas charging (intake air boosting) and EGR are two technologies which when implemented in the natural gas-diesel engines, provide the opportunity to achieve higher efficiencies and loads and low emissions. Simulation study is one of the approaches to investigate the extent and effects of gas charging and EGR on the performance of the engine. With the rapid improvements over the past decade in the field of engine simulation and modeling, it has become an efficient, economical and reliable approach. GT-Suite, one of the widely-used Vehicle and Engine Simulation tools in the industries, provides the capabilities to calculate the combustion rate in Internal combustion engines for conventional as well as dual-fuel engines. Current research work uses GT-Suite software to study the effect of gas charging and EGR on a Cummins 2010 ISB 6.7 L engine in dual-fuel mode. One-dimensional simulation model for a Cummins 2010 ISB 6.7 L engine is developed by acquisition of dimensions from the engine. The simulation model is calibrated with the experimental data available from the diesel engine. The calibrated model is then developed into a dual-fuel model which is used to study the effect of EGR for diesel energy contribution percentages of 1,3, 5 and 10 and injection pressures of 300,600 and 1000 bar at diesel injection timings of 0° and 10° bTDC and a boost pressure of 2.5 bar. EGR levels were varied from 0-18%. Based on the simulation results for the test conditions, cases for lowest BMEP at 0° bTDC and 10° bTDC were selected and a boost pressure sweep was performed from 2.5 bar to 3 bar to study the effect of gas charging. The simulation results proved that the target BMEP of 25 bar and fuel conversion efficiency of up to 41% could be achieved in dual fuel mode for the Cummins 6.7L engine. Advisors/Committee Members: Jeffrey D. Naber.

Subjects/Keywords: Simulation; Dual-fuel Engine; Gas charging; EGR; diesel micro-pilot; natural gas; Automotive Engineering; Heat Transfer, Combustion

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APA (6^th Edition):

Gorthy, S. N. S. S. (2017). SIMULATION STUDY ON EFFECT OF GAS CHARGING AND EGR IN A DUAL-FUEL ENGINE. (Masters Thesis). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/429

Chicago Manual of Style (16^th Edition):

Gorthy, Satyavenkata Naga Sai Sharath. “SIMULATION STUDY ON EFFECT OF GAS CHARGING AND EGR IN A DUAL-FUEL ENGINE.” 2017. Masters Thesis, Michigan Technological University. Accessed February 27, 2021. https://digitalcommons.mtu.edu/etdr/429.

MLA Handbook (7^th Edition):

Gorthy, Satyavenkata Naga Sai Sharath. “SIMULATION STUDY ON EFFECT OF GAS CHARGING AND EGR IN A DUAL-FUEL ENGINE.” 2017. Web. 27 Feb 2021.

Vancouver:

Gorthy SNSS. SIMULATION STUDY ON EFFECT OF GAS CHARGING AND EGR IN A DUAL-FUEL ENGINE. [Internet] [Masters thesis]. Michigan Technological University; 2017. [cited 2021 Feb 27]. Available from: https://digitalcommons.mtu.edu/etdr/429.

Council of Science Editors:

Gorthy SNSS. SIMULATION STUDY ON EFFECT OF GAS CHARGING AND EGR IN A DUAL-FUEL ENGINE. [Masters Thesis]. Michigan Technological University; 2017. Available from: https://digitalcommons.mtu.edu/etdr/429

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

Degree: 2019, Marquette University

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

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

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

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

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APA (6^th Edition):

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

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

Chicago Manual of Style (16^th Edition):

Roulo, David J. “Effect of Low Reactivity Fuel on Reaction Wave Growth of Dual-Fuel Stratified Mixtures in a Rapid Compression Machine.” 2019. Thesis, Marquette University. Accessed February 27, 2021. https://epublications.marquette.edu/theses_open/540.

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

MLA Handbook (7^th Edition):

Roulo, David J. “Effect of Low Reactivity Fuel on Reaction Wave Growth of Dual-Fuel Stratified Mixtures in a Rapid Compression Machine.” 2019. Web. 27 Feb 2021.

Vancouver:

Roulo DJ. Effect of Low Reactivity Fuel on Reaction Wave Growth of Dual-Fuel Stratified Mixtures in a Rapid Compression Machine. [Internet] [Thesis]. Marquette University; 2019. [cited 2021 Feb 27]. Available from: https://epublications.marquette.edu/theses_open/540.

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

Council of Science Editors:

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

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

Purdue University

18. Wang, Zhiyan. Fundamental studies of flame propagation in lean-burn natural gas engines.

Degree: PhD, Mechanical Engineering, 2016, Purdue University

URL: https://docs.lib.purdue.edu/open_access_dissertations/1027

► Lean-burn natural gas engines offer enhanced thermal efficiencies and reduced soot and NOx emissions. However, cycle-to-cycle variability in combustion that can result from unreliable… (more)

▼ Lean-burn natural gas engines offer enhanced thermal efficiencies and reduced soot and NOx emissions. However, cycle-to-cycle variability in combustion that can result from unreliable ignition, variability in equivalence ratio and quenching is a challenge. Reliability of ignition can be improved by employing a dual-fuel ignition strategy in which a small quantity of diesel fuel is injected to initiate ignition. Computational studies of n-heptane/methane-air mixing layers are performed to provide insight into the fundamental physics of dual-fuel ignition. The results show that the characteristic time required for steady premixed flame propagation has three components: time for autoignition to occur, time for peak temperature to be achieved following autoignition, and time for steady flame propagation in the premixed fuel/air mixture to be achieved. The autoignition time correlates well with pressure and temperature of the unburned premixed charge. The time to achieve peak temperature is relatively short, but correlates with mixing layer thickness and premixed equivalence ratio. The time to achieve steady propagation correlates with mixing layer thickness and laminar flame speed and thickness. Subsequent work focuses on turbulent flame propagation in lean homogeneous mixtures by employing direct numerical simulations (DNS) under conditions that are relevant to lean-burn engines. Attention is specifically focused on the turbulent flame speed (ST) as a parameter of interest because of its importance in modeling combustion in engines. The studies are carried out in the thin reaction zone (TRZ) regime of turbulent premixed combustion. Normalized turbulence intensity (urms/SL) varies from 2 to 25 and the ratio of integral length scale to flame thickness (L o/δL) varies from 3.2 to 12.8. Initial studies show that the normalized turbulent flame speed (ST/SL) depends on more parameters than urms/SL suggested by some models. Although it is known that the turbulent flame speed varies with equivalence ratio, it is shown that the normalized turbulent flame speed does not change with equivalence ratio provided the Karlovitz (Ka) and Damköhler (Da) numbers are fixed. This suggests that Kaand/or Da are important parameters in characterizing the turbulent flame speed. Furthermore, ST/SL can be related to the flame area enhancement AT/AL and an efficiency factor Io which is close to unity. AT/AL is raised by increasing turbulent Reynolds number ReT and by reducing Ka. Increasing ReT leads to a broader spectrum of turbulent eddies that generate flame surface area. Increasing Karesults in fine wrinkling at the expense of larger scale wrinkling. This results in a net reduction in the effective surface area enhancement. Based on these insights, a correlation for ST that shows a dependence on Re T and Ka is proposed. Modeling of the Flame Surface Density (FSD) evolution is also considered. FSD is influenced by tangential strain rate and flame… Advisors/Committee Members: John Abraham, John Abraham, Peter H. Meckl, Steven Son, Haifeng Wang.

Subjects/Keywords: Applied sciences; DNS; Dual-fuel; Lean-burn; Natural gas engine; Premixed combustion; Turbulent flame speed; Chemical Engineering; Mechanical Engineering

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APA (6^th Edition):

Wang, Z. (2016). Fundamental studies of flame propagation in lean-burn natural gas engines. (Doctoral Dissertation). Purdue University. Retrieved from https://docs.lib.purdue.edu/open_access_dissertations/1027

Chicago Manual of Style (16^th Edition):

Wang, Zhiyan. “Fundamental studies of flame propagation in lean-burn natural gas engines.” 2016. Doctoral Dissertation, Purdue University. Accessed February 27, 2021. https://docs.lib.purdue.edu/open_access_dissertations/1027.

MLA Handbook (7^th Edition):

Wang, Zhiyan. “Fundamental studies of flame propagation in lean-burn natural gas engines.” 2016. Web. 27 Feb 2021.

Vancouver:

Wang Z. Fundamental studies of flame propagation in lean-burn natural gas engines. [Internet] [Doctoral dissertation]. Purdue University; 2016. [cited 2021 Feb 27]. Available from: https://docs.lib.purdue.edu/open_access_dissertations/1027.

Council of Science Editors:

Wang Z. Fundamental studies of flame propagation in lean-burn natural gas engines. [Doctoral Dissertation]. Purdue University; 2016. Available from: https://docs.lib.purdue.edu/open_access_dissertations/1027

University of Lund

19. Garcia, Pablo. Experimental Investigations on Natural Gas-Diesel Dual Fuel Combustion.

Degree: 2018, University of Lund

URL: https://lup.lub.lu.se/record/ff5abaa0-209f-4c69-b78e-5d63ef0f0273 ; https://portal.research.lu.se/ws/files/63590017/Thesis_Pablo_Garcia_Final_reduced_size_.pdf

► Natural gas has been traditionally applied in spark-ignited combustion engines due to similar combustion characteristics for methane gas and gasoline. However, spark ignition requires a… (more)

▼ Natural gas has been traditionally applied in spark-ignited combustion engines due to similar combustion characteristics for methane gas and gasoline. However, spark ignition requires a low compression ratio to avoid knock problems and therefore, gas engines have lower efficiency than diesel engines. A combustion concept that has been successfully applied on large stationary engines and to some extent on heavy duty engines is dual fuel combustion, where a compression ignited diesel pilot injection is used to ignite a homogeneous charge of natural gas and air. This dual fuel combustion concept is well established for large stationary engines and exists as an after-market solution for heavy duty engines but does not exist at all for light duty engines. This concept offers a high degree of flexibility for the engine operation because dual fuel combustion does not require heavy modifications of the original diesel engine architecture, so diesel operation could remain unaltered. The scope of this thesis is to explore the implementation of this dual fuel concept on different types of applications using the diesel injection system as an alternative ignition system for lean natural gas mixtures.The main objectives are the identification of pathways to increase combustion efficiency at low loads, improve the understanding of how pilot injection should be controlled over the entire operating range and finally, analyze the interaction between the pilot and main air-gas charge. Experiments resulted in robust and efficient high gas fraction dual fuel operation from 5 bar IMEPg. Below this load, insufficient exhaust energy limits the applicability of this concept. The pathways explored to increase combustion efficiency at low load resulted in a minimum gross indicated efficiency of 40% from 3 bar IMEPg. Moreover, the use of alternative pilot injection strategies allows a simultaneous reduction of TUHC and NOx emissions and knockfree operation. Under certain conditions, operation without NOx after-treatment system is possible. This requires operation near the lean limit, which has been experimentally evaluated and a gas equivalence ratio of 0.44 is proposed, considering methane emissions and exhaust temperature levels.

Subjects/Keywords: Energy Engineering; Dual Fuel; Diesel; Natural Gas; Pilot Injection; Combustion Efficiency; Methane; Nitrogen Oxides; Lean operation; Ignition

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APA (6^th Edition):

Garcia, P. (2018). Experimental Investigations on Natural Gas-Diesel Dual Fuel Combustion. (Doctoral Dissertation). University of Lund. Retrieved from https://lup.lub.lu.se/record/ff5abaa0-209f-4c69-b78e-5d63ef0f0273 ; https://portal.research.lu.se/ws/files/63590017/Thesis_Pablo_Garcia_Final_reduced_size_.pdf

Chicago Manual of Style (16^th Edition):

Garcia, Pablo. “Experimental Investigations on Natural Gas-Diesel Dual Fuel Combustion.” 2018. Doctoral Dissertation, University of Lund. Accessed February 27, 2021. https://lup.lub.lu.se/record/ff5abaa0-209f-4c69-b78e-5d63ef0f0273 ; https://portal.research.lu.se/ws/files/63590017/Thesis_Pablo_Garcia_Final_reduced_size_.pdf.

MLA Handbook (7^th Edition):

Garcia, Pablo. “Experimental Investigations on Natural Gas-Diesel Dual Fuel Combustion.” 2018. Web. 27 Feb 2021.

Vancouver:

Garcia P. Experimental Investigations on Natural Gas-Diesel Dual Fuel Combustion. [Internet] [Doctoral dissertation]. University of Lund; 2018. [cited 2021 Feb 27]. Available from: https://lup.lub.lu.se/record/ff5abaa0-209f-4c69-b78e-5d63ef0f0273 ; https://portal.research.lu.se/ws/files/63590017/Thesis_Pablo_Garcia_Final_reduced_size_.pdf.

Council of Science Editors:

Garcia P. Experimental Investigations on Natural Gas-Diesel Dual Fuel Combustion. [Doctoral Dissertation]. University of Lund; 2018. Available from: https://lup.lub.lu.se/record/ff5abaa0-209f-4c69-b78e-5d63ef0f0273 ; https://portal.research.lu.se/ws/files/63590017/Thesis_Pablo_Garcia_Final_reduced_size_.pdf

Georgia Southern University

20. Williams, Johnnie L, Jr. Investigation of the Performance and Emissions Characteristics of Dual Fuel Combustion in a Single Cylinder IDI Diesel Engine.

Degree: MSin Applied Engineering (M.S.A.E.), Department of Mechanical Engineering, 2018, Georgia Southern University

URL: https://digitalcommons.georgiasouthern.edu/etd/1843

► Restrictions in the allowable exhaust gas emissions of diesel engines has become a driving factor in the design, development, and implementation of internal combustion… (more)

Subjects/Keywords: Combustion; Dual Fuel; Soot; NOx; Diesel; n-Butanol; Computer-Aided Engineering and Design; Heat Transfer, Combustion; Jack N. Averitt College of Graduate Studies, Electronic Theses & Dissertations, ETDs, Student Research

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

APA (6^th Edition):

Williams, Johnnie L, J. (2018). Investigation of the Performance and Emissions Characteristics of Dual Fuel Combustion in a Single Cylinder IDI Diesel Engine. (Masters Thesis). Georgia Southern University. Retrieved from https://digitalcommons.georgiasouthern.edu/etd/1843

Chicago Manual of Style (16^th Edition):

Williams, Johnnie L, Jr. “Investigation of the Performance and Emissions Characteristics of Dual Fuel Combustion in a Single Cylinder IDI Diesel Engine.” 2018. Masters Thesis, Georgia Southern University. Accessed February 27, 2021. https://digitalcommons.georgiasouthern.edu/etd/1843.

MLA Handbook (7^th Edition):

Williams, Johnnie L, Jr. “Investigation of the Performance and Emissions Characteristics of Dual Fuel Combustion in a Single Cylinder IDI Diesel Engine.” 2018. Web. 27 Feb 2021.

Vancouver:

Williams, Johnnie L J. Investigation of the Performance and Emissions Characteristics of Dual Fuel Combustion in a Single Cylinder IDI Diesel Engine. [Internet] [Masters thesis]. Georgia Southern University; 2018. [cited 2021 Feb 27]. Available from: https://digitalcommons.georgiasouthern.edu/etd/1843.

Council of Science Editors:

Williams, Johnnie L J. Investigation of the Performance and Emissions Characteristics of Dual Fuel Combustion in a Single Cylinder IDI Diesel Engine. [Masters Thesis]. Georgia Southern University; 2018. Available from: https://digitalcommons.georgiasouthern.edu/etd/1843

University of Illinois – Chicago

21. Fu, Xiao. Partially Premixed Combustion in Counterflow Flame and Dual Fuel Compression Ignition Engine.

Degree: 2016, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/20168

► The overall objective of this research is to examine strategies for reducing NOx and soot emissions in diesel engine. The thesis has two parts. In… (more)

▼ The overall objective of this research is to examine strategies for reducing NOx and soot emissions in diesel engine. The thesis has two parts. In the first part, the effect of unsaturation or the presence of a double bond in the fuel molecular structure on NOx and soot formation is investigated. Simulations have been performed for partially premixed flames burning n-heptane and 1-heptene fuels in a counterflow configuration and a constant volume diesel combustion vessel to examine the effect of unsaturation at different level of partial premixing and strain rate. A validated detailed kinetic model with 198 species and 4932 reactions has been used in the counterflow flame simulations. Results indicate that the presence of unsaturated bond leads to increased formation of acetylene and propargyl through  scission reactions, resulting in higher prompt NO, PAH and soot in 1-heptene flames than in n-heptane flames. Since these results are obtained in laminar flames, the study is extended to examine the effect of double bond in spray flames at diesel engine conditions. 3-D simulations are performed using CFD code (CONVERGE) to examine the structure and emission characteristics of n-heptane and 1-heptene spray flames in a constant-volume combustion vessel. The directed relation graph methodology is used to develop a reduced mechanism (207 species and 4094 reactions) starting from the detailed mechanism (482 species and 19072 reactions). Results indicate that the combustion under diesel engine conditions is characterized by a double-flame structure with a rich premixed reaction zone (RPZ) near the flame stabilization region and a non-premixed reaction zone (NPZ) further downstream. Most of NOx is formed via thermal NO route in the NPZ, while PAH species are mainly formed in the RPZ. The presence of a double bond results in  scission reactions, leading to higher temperature and consequently higher NO in 1-heptene flame than that in n-heptane flame. It also leads to a significantly higher PAH species, implying increased soot emission in 1-heptene flame than that in n-heptane flame. Reaction path analysis indicated that this is due to significantly higher amounts of 1,3-butadiene and allene formed from  scission reactions due to the presence of double bond. In the second part of this research, a dual-fuel strategy for reducing emissions in a diesel engine has been examined. N-heptane and methane have been used as surrogates for diesel (pilot fuel) and natural gas (main fuel), respectively. The physical and chemical processes of dual-fuel combustion are simulated using CONVERGE and a reduced reaction mechanism (42 species, 168 reactions). The mechanism is validated against the experimental data for ignition and flame speed at engine relevant conditions. In engine simulations, methane is premixed with air during the intake, and then ignited by the n-heptane pilot injection. The heat release for the single-fuel case involves a hybrid combustion mode, characterized by rich premixed combustion and diffusion combustion,… Advisors/Committee Members: Aggarwal, Suresh K. (advisor), Brezinsky, Kenneth (committee member), Mashayek, Farzad (committee member), Som, Sibendu (committee member), Senecal, Peter K. (committee member).

Subjects/Keywords: Fuel unsaturation; NOx and PAH emissions; counterflow partially premixed flame; n-heptane; 1-heptene; spray combustion; two stage ignition; dual fuel; diesel engine; NTC phenomenon

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APA (6^th Edition):

Fu, X. (2016). Partially Premixed Combustion in Counterflow Flame and Dual Fuel Compression Ignition Engine. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/20168

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):

Fu, Xiao. “Partially Premixed Combustion in Counterflow Flame and Dual Fuel Compression Ignition Engine.” 2016. Thesis, University of Illinois – Chicago. Accessed February 27, 2021. http://hdl.handle.net/10027/20168.

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

MLA Handbook (7^th Edition):

Fu, Xiao. “Partially Premixed Combustion in Counterflow Flame and Dual Fuel Compression Ignition Engine.” 2016. Web. 27 Feb 2021.

Vancouver:

Fu X. Partially Premixed Combustion in Counterflow Flame and Dual Fuel Compression Ignition Engine. [Internet] [Thesis]. University of Illinois – Chicago; 2016. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10027/20168.

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

Council of Science Editors:

Fu X. Partially Premixed Combustion in Counterflow Flame and Dual Fuel Compression Ignition Engine. [Thesis]. University of Illinois – Chicago; 2016. Available from: http://hdl.handle.net/10027/20168

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

22. VALLINAYAGAM RAMAN. Experimental and numerical investigation of novel pine oil biofuel in a diesel engine.

Degree: 2014, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/77777

Subjects/Keywords: Pine oil; bio fuel; diesel engine; emission; combustion; dual fuel

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APA (6^th Edition):

RAMAN, V. (2014). Experimental and numerical investigation of novel pine oil biofuel in a diesel engine. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/77777

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):

RAMAN, VALLINAYAGAM. “Experimental and numerical investigation of novel pine oil biofuel in a diesel engine.” 2014. Thesis, National University of Singapore. Accessed February 27, 2021. http://scholarbank.nus.edu.sg/handle/10635/77777.

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

MLA Handbook (7^th Edition):

RAMAN, VALLINAYAGAM. “Experimental and numerical investigation of novel pine oil biofuel in a diesel engine.” 2014. Web. 27 Feb 2021.

Vancouver:

RAMAN V. Experimental and numerical investigation of novel pine oil biofuel in a diesel engine. [Internet] [Thesis]. National University of Singapore; 2014. [cited 2021 Feb 27]. Available from: http://scholarbank.nus.edu.sg/handle/10635/77777.

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

Council of Science Editors:

RAMAN V. Experimental and numerical investigation of novel pine oil biofuel in a diesel engine. [Thesis]. National University of Singapore; 2014. Available from: http://scholarbank.nus.edu.sg/handle/10635/77777

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

Pontifical Catholic University of Rio de Janeiro

23. JUAN CARLOS VALDEZ LOAIZA. [en] REACTIVITY CONTROLLED COMPRESSION IGNITION OF DIESEL FUEL AND ETHANOL IN RAPID COMPRESSION MACHINE.

Degree: 2018, Pontifical Catholic University of Rio de Janeiro

URL: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35559

►

[pt] Serão necessários muitos anos para que os biocombustíveis sejam capazes de substituir integralmente os derivados fósseis. Este trabalho visa estudar formas alternativas de conversão… (more)

▼

[pt] Serão necessários muitos anos para que os biocombustíveis sejam capazes de substituir integralmente os derivados fósseis. Este trabalho visa estudar formas alternativas de conversão de energia contida nos combustíveis utilizados em motores de combustão interna. Maiores eficiências na conversão da energia contida no combustível e uma menor emissão dos gases de exaustão são benefícios associados à ignição por compressão de reatividade controlada, RCCI, onde dois fluidos com diferentes reatividades são introduzidos na câmara de combustão em instantes diferentes. Optou-se pelo uso de uma máquina de compressão rápida, MCR, capaz de controlar parâmetros relevantes, como taxa de compressão, pressões, tempos de injeção, que foi adaptada para receber dois sistemas de injeção direta na câmara de combustão. Como segundo combustível, que substitui parcialmente o óleo diesel, que é empregado tradicionalmente em motores de ignição por compressão, optou-se pelo etanol hidratado. Os estudos revelaram que diferentes formas de injeção dos dois combustíveis produzem processos muito diferentes, para as mesmas quantidades de combustíveis injetados. Os resultados são apresentados na forma de pressão indicada como função do ângulo equivalente, bem como calor liberado e atraso de ignição. Experiências foram conduzidas para uma ou duas injeções de etanol por ciclo, em diferentes tempos. Altas razões de substituição do combustível fóssil foram obtidas, quando comparadas com a técnica de fumigação, onde o segundo combustível é misturado externamente ao ar de combustão.

[en] Many years will be needed for biofuels or other renewable sources to be able to fully replace fossil fuels. This work aims to study alternative ways of converting energy contained in fuels used in internal combustion engines. Higher efficiencies in converting the energy contained in the fuel and lower emission of harmful exhaust gases are benefits associated with the Reactivity Controlled Compression Ignition, known for RCCI. In this type of combustion, two fluids with different ignition-reactivity characteristics are introduced into the combustion chamber at different times. To better understand this phenomenon, it was used a RCM, that is able to control, more easily, relevant parameters such as compression ratio, temperatures, pressures, injection times etc. As a second fuel, which partially replaces the diesel, which is traditionally used in compression ignition engines, it was used the ethanol. The RCM was then adapted to receive two systems for direct injection into the combustion chamber. Studies have shown that different forms of injection of the two fuels produce very different processes to the same amount of fuel injected. The results are presented in the form of indicated pressure as a function of position. Heat released and ignition delay are also presented. Experiments were conducted for one or two injections of ethanol per cycle at different times. High substitution rates of the fossil fuel were obtained when compared to injections of external mixtures…

Advisors/Committee Members: SERGIO LEAL BRAGA.

Subjects/Keywords: [pt] COMBUSTAO; [en] COMBUSTION; [pt] IGNICAO POR COMPRESSAO COM REATIVIDADE CONTROLADA; [en] REACTIVITY CONTROLLED COMPRESSION IGNITION; [pt] DUAL FUEL; [en] DUAL FUEL; [pt] DIESEL ETANOL; [en] DIESEL ETHANOL; [pt] MAQUINA DE COMPRESSAO RAPIDA; [en] RAPID COMPRESSION MACHINE

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APA (6^th Edition):

LOAIZA, J. C. V. (2018). [en] REACTIVITY CONTROLLED COMPRESSION IGNITION OF DIESEL FUEL AND ETHANOL IN RAPID COMPRESSION MACHINE. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35559

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):

LOAIZA, JUAN CARLOS VALDEZ. “[en] REACTIVITY CONTROLLED COMPRESSION IGNITION OF DIESEL FUEL AND ETHANOL IN RAPID COMPRESSION MACHINE.” 2018. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed February 27, 2021. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35559.

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

MLA Handbook (7^th Edition):

LOAIZA, JUAN CARLOS VALDEZ. “[en] REACTIVITY CONTROLLED COMPRESSION IGNITION OF DIESEL FUEL AND ETHANOL IN RAPID COMPRESSION MACHINE.” 2018. Web. 27 Feb 2021.

Vancouver:

LOAIZA JCV. [en] REACTIVITY CONTROLLED COMPRESSION IGNITION OF DIESEL FUEL AND ETHANOL IN RAPID COMPRESSION MACHINE. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2018. [cited 2021 Feb 27]. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35559.

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

Council of Science Editors:

LOAIZA JCV. [en] REACTIVITY CONTROLLED COMPRESSION IGNITION OF DIESEL FUEL AND ETHANOL IN RAPID COMPRESSION MACHINE. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2018. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35559

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

KTH

24. ASTORSDOTTER, JENNIFER; RICKNELL, JONAS; YU, FIONA. Utformning av avgaskatalysator.

Degree: Chemical Science and Engineering (CHE), 2015, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173552

► Naturgas är ett alternativ till oljebaserade bränslen. Ur ett miljöperspektiv är naturgasen fördelaktig eftersom den vid förbränning ger mindre utsläpp av miljöfarliga ämnen än… (more)

Subjects/Keywords: Exhaust gas catalyst; methane combustion; low temperature; natural gas; diesel dual-fuel; palladium catalyst; indium tin oxide catalyst; Avgaskatalys; metanförbränning; låga temperaturer; naturgas; diesel dual-fuel; palladium katalysator; indium tennoxid katalysator

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APA (6^th Edition):

ASTORSDOTTER, JENNIFER; RICKNELL, JONAS; YU, F. (2015). Utformning av avgaskatalysator. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173552

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):

ASTORSDOTTER, JENNIFER; RICKNELL, JONAS; YU, FIONA. “Utformning av avgaskatalysator.” 2015. Thesis, KTH. Accessed February 27, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173552.

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

MLA Handbook (7^th Edition):

ASTORSDOTTER, JENNIFER; RICKNELL, JONAS; YU, FIONA. “Utformning av avgaskatalysator.” 2015. Web. 27 Feb 2021.

Vancouver:

ASTORSDOTTER, JENNIFER; RICKNELL, JONAS; YU F. Utformning av avgaskatalysator. [Internet] [Thesis]. KTH; 2015. [cited 2021 Feb 27]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173552.

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

Council of Science Editors:

ASTORSDOTTER, JENNIFER; RICKNELL, JONAS; YU F. Utformning av avgaskatalysator. [Thesis]. KTH; 2015. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173552

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

Queens University

25. Merkel, Cole. Diesel Spray and Premixed Methane-Air Ignition Behind a Reflected Shock Wave .

Degree: Mechanical and Materials Engineering, Queens University

URL: http://hdl.handle.net/1974/26632

► This study investigates single-event ignition of diesel fuel injected into methane-air that is applicable to compression ignition dual fuel engine conditions. Post compression cylinder temperature… (more)

▼ This study investigates single-event ignition of diesel fuel injected into methane-air that is applicable to compression ignition dual fuel engine conditions. Post compression cylinder temperature and pressure conditions were created behind a reflected shock wave in a 76 mm square-channel shock tube. A common-rail piezoelectric diesel injector with 8 tip orifices was mounted in the centre of the shock tube end wall to replicate in-cylinder placement. A single pass 150 mm diameter z-type high-speed schlieren system was used to capture ignition in a 250 mm long optical section. Additionally, direct photography was used in some tests to identify the location of ignition via the first emission of visible light. Tests were carried out at a nominal reflected pressure of 10 bar and temperatures in the range of 880 – 1500 K, with the aim of studying ignition delay within and beyond the negative temperature coefficient regime. The test gas was composed of synthetic air, with argon replacing nitrogen. Both schlieren video and pressure-history were used to measure ignition delay time. The high-speed photography showed that premature ignition was promoted by metal particles in the bottom half of the channel. By filtering out the premature ignition events it was found that the ignition delay time, for both diesel spray and premixed methane-air, correlated well with an Arrhenius temperature dependency. Diesel experiments were carried out with two injection durations (0.15 and 0.5 ms), and it was found to play an important role in the ignition location but not the ignition delay time. For a 0.15 ms injection time no ignition was observed for temperatures below 1050 K because of overmixing. Methane-air tests were carried out primarily at equivalence ratios of 0.25 and 0.5, a limited number of tests were carried out at stoichiometric conditions. Two-stage ignition (mild and strong) was observed in methane-air for temperatures above 1000 K and 1100 K for equivalence ratios of 0.25 and 0.5, respectively. Constant volume model predictions using two reaction mechanisms from the literature compared unfavorably with the measured ignition delay time. The methane-air ignition delay time showed some dependency on equivalence ratio.

Subjects/Keywords: Shock Tube ; Diesel Spray Ignition ; Methane-Air Ignition ; Ignition Delay ; Dual Fuel Combustion

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

APA (6^th Edition):

Merkel, C. (n.d.). Diesel Spray and Premixed Methane-Air Ignition Behind a Reflected Shock Wave . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/26632

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Merkel, Cole. “Diesel Spray and Premixed Methane-Air Ignition Behind a Reflected Shock Wave .” Thesis, Queens University. Accessed February 27, 2021. http://hdl.handle.net/1974/26632.

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Merkel, Cole. “Diesel Spray and Premixed Methane-Air Ignition Behind a Reflected Shock Wave .” Web. 27 Feb 2021.

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

Vancouver:

Merkel C. Diesel Spray and Premixed Methane-Air Ignition Behind a Reflected Shock Wave . [Internet] [Thesis]. Queens University; [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1974/26632.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

Council of Science Editors:

Merkel C. Diesel Spray and Premixed Methane-Air Ignition Behind a Reflected Shock Wave . [Thesis]. Queens University; Available from: http://hdl.handle.net/1974/26632

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

Pontifical Catholic University of Rio de Janeiro

26. JULIO CESAR CUISANO EGUSQUIZA. [en] EXPERIMENTAL INVESTIGATION OF A DIESEL CYCLE ENGINE OPERATING ON DUAL-FUEL MODE: DIESEL / ETHANOL AND DIESEL / GAS.

Degree: 2011, Pontifical Catholic University of Rio de Janeiro

URL: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=17103

►

[pt] No presente trabalho, ensaios experimentais de um motor do ciclo Diesel consumindo etanol hidratado ou gás natural em substituição parcial ao óleo diesel, foram… (more)

▼

[pt] No presente trabalho, ensaios experimentais de um motor do ciclo Diesel consumindo etanol hidratado ou gás natural em substituição parcial ao óleo diesel, foram realizados. Os objetivos principais foram verificar as influências dos combustíveis alternativos e avaliar as técnicas do avanço da injeção do diesel e da restrição parcial do ar de admissão, em relação aos parâmetros característicos da combustão, desempenho e emissões. Com base nos dados do diagrama pressão-ângulo de virabrequim, foi possível analisar alguns parâmetros característicos da combustão, tais como o início da combustão, a máxima taxa de elevação de pressão e o pico de pressão. Os parâmetros do desempenho e emissões do motor foram analisados através do rendimento térmico e as concentrações de monóxido de carbono, hidrocarbonetos, material particulado e óxidos de nitrogênio. Os resultados obtidos mostraram que as técnicas avaliadas no modo bicombustível junto com as elevadas taxas de substituição do óleo diesel favoreceram a melhor queima dos combustíveis alternativos, refletindo-se favoravelmente em menores emissões de CO e MP, além de um pequeno aumento no rendimento térmico do motor. No entanto, houve também um acréscimo nas emissões de NOX e, no caso específico do avanço da injeção, foi notado um maior ruído gerado pelo motor.

[en] In this report, experimental tests of a Diesel cycle engine running with hydrous ethanol or natural gas with partial substitution for diesel fuel were performed. The main objectives were to verify the influence of alternative fuels and evaluate the advancing of diesel injection timing and the air partial restriction, regarding the characteristic parameters of combustion, performance and emissions. Based on data from the pressure-crank angle diagram, it was possible to analyze some characteristic parameters of combustion, such as the start of combustion, the maximum rate of pressure rise and peak pressure. The parameters of the engine performance and emissions were analyzed through the thermal efficiency and the concentrations of carbon monoxide, hydrocarbons, particulate matter and nitrogen oxides. The results showed that the techniques evaluated in dual fuel mode with higher rates of substitution of diesel fuel favored a better burning of the alternative fuels, reflecting favorably in lower emissions of CO and PM, and also in a small increase in the engine thermal efficiency. However, there was also an increase in NOX emissions and, in the specific case of the advanced injection timing, it was noted a louder noise generated by the engine.

Advisors/Committee Members: SERGIO LEAL BRAGA.

Subjects/Keywords: [pt] COMBUSTAO; [en] COMBUSTION; [pt] EMISSOES; [en] EMISSIONS; [pt] MOTOR BICOMBUSTIVEL; [en] DUAL FUEL ENGINE; [pt] DIESEL-GAS; [en] DIESEL-GAS; [pt] ETANOL; [en] ETHANOL

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

APA (6^th Edition):

EGUSQUIZA, J. C. C. (2011). [en] EXPERIMENTAL INVESTIGATION OF A DIESEL CYCLE ENGINE OPERATING ON DUAL-FUEL MODE: DIESEL / ETHANOL AND DIESEL / GAS. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=17103

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):

EGUSQUIZA, JULIO CESAR CUISANO. “[en] EXPERIMENTAL INVESTIGATION OF A DIESEL CYCLE ENGINE OPERATING ON DUAL-FUEL MODE: DIESEL / ETHANOL AND DIESEL / GAS.” 2011. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed February 27, 2021. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=17103.

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

MLA Handbook (7^th Edition):

EGUSQUIZA, JULIO CESAR CUISANO. “[en] EXPERIMENTAL INVESTIGATION OF A DIESEL CYCLE ENGINE OPERATING ON DUAL-FUEL MODE: DIESEL / ETHANOL AND DIESEL / GAS.” 2011. Web. 27 Feb 2021.

Vancouver:

EGUSQUIZA JCC. [en] EXPERIMENTAL INVESTIGATION OF A DIESEL CYCLE ENGINE OPERATING ON DUAL-FUEL MODE: DIESEL / ETHANOL AND DIESEL / GAS. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2011. [cited 2021 Feb 27]. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=17103.

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

Council of Science Editors:

EGUSQUIZA JCC. [en] EXPERIMENTAL INVESTIGATION OF A DIESEL CYCLE ENGINE OPERATING ON DUAL-FUEL MODE: DIESEL / ETHANOL AND DIESEL / GAS. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2011. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=17103

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

Pontifical Catholic University of Rio de Janeiro

27. CESAR GONZALO VERA VASQUEZ. [en] REDUCTION OF THE EMISSIONS IN GAS DIESEL GENERATORS.

Degree: 2011, Pontifical Catholic University of Rio de Janeiro

URL: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=17166

►

[pt] O trabalho tem como objetivo a conversão de um grupo gerador, originalmente Diesel, para operar no modo Diesel-Gás, onde estes dois combustíveis são administrados… (more)

▼

[pt] O trabalho tem como objetivo a conversão de um grupo gerador, originalmente Diesel, para operar no modo Diesel-Gás, onde estes dois combustíveis são administrados simultaneamente no motor. Para tal foi utilizado um grupo gerador de 120KW, com um motor Perkins 1006 TAG (turbo alimentado com intercooler). Medidas experimentais foram realizadas tanto no modo Diesel quanto no bicombustível Diesel-gás. Foram avaliados: desempenho e, principalmente, emissões de poluentes atmosféricos. A redução das emissões foi realizada mediante a restrição parcial do ar de combustão, regulada por uma válvula tipo borboleta, que funciona eletronicamente, posicionada na entrada do coletor de admissão. A relação Diesel-Gás foi também avaliada, onde o segundo combustível era administrado através de um sistema eletrônico de injeção de gás natural. Os resultados indicam que em cargas baixas as reduções de monóxido de carbono e hidrocarbonatos são significativas (50% de redução de HC e 20% de CO) com máximas taxas de substituição. O mesmo se observa em cargas intermediárias. Em cargas médias e baixas observa-se um leve aumento nas emissões de óxido nitroso. Pode-se observar uma melhora no rendimento global do grupo gerador com o aumento da carga e da taxa de substituição. De forma geral, conseguiu-se reduzir os níveis de emissões em altas cargas, principalmente de hidrocarbonetos e monóxido de carbono.

[en] The objective of this study is converting a generator, originally Diesel, to operate in a Diesel-Gas; two fuels are administered simultaneously to the motor. One diesel generator of 120KW model Perkins 1006 TAG (powered with turbo intercooler), running on the Diesel / natural gas dual fuel mode, was tested. Experimental measurements were performed in both the Diesel and dual fuel diesel-gas. Are evaluated performances and; especially air pollutant emissions. The emission reduction was carried out by partial restriction of the combustion air with the help of an electronic throttle valve, positioned before the intake manifold. The ratio Diesel-Gas was evaluated, where the second fuel (natural gas) was administered with one electronic injection of natural gas. The results indicate that at low loads the reductions in carbon monoxide and hydrocarbons are significant (50% reduction in HC and 20% CO) with maximum replacement rates. Something like is observed at intermediate loads. In medium and low loads there is a slight increase in emissions of nitrous oxides. One can observe a slight increase in overall yield of the generator with the increased workload and the replacement rate; in general it was possible to reduce emissions at high loads, especially in hydrocarbons and carbon monoxide.

Advisors/Committee Members: SERGIO LEAL BRAGA.

Subjects/Keywords: [pt] GAS NATURAL; [en] NATURAL GAS; [pt] COMBUSTAO; [en] COMBUSTION; [pt] GERACAO TERMOELETRICA; [en] THERMOELECTRICAL POWER GENERATION; [pt] EMISSOES; [en] EMISSIONS; [pt] MOTOR DIESEL-GAS; [en] DUAL-FUEL ENGINE

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

APA (6^th Edition):

VASQUEZ, C. G. V. (2011). [en] REDUCTION OF THE EMISSIONS IN GAS DIESEL GENERATORS. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=17166

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):

VASQUEZ, CESAR GONZALO VERA. “[en] REDUCTION OF THE EMISSIONS IN GAS DIESEL GENERATORS.” 2011. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed February 27, 2021. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=17166.

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

MLA Handbook (7^th Edition):

VASQUEZ, CESAR GONZALO VERA. “[en] REDUCTION OF THE EMISSIONS IN GAS DIESEL GENERATORS.” 2011. Web. 27 Feb 2021.

Vancouver:

VASQUEZ CGV. [en] REDUCTION OF THE EMISSIONS IN GAS DIESEL GENERATORS. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2011. [cited 2021 Feb 27]. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=17166.

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

Council of Science Editors:

VASQUEZ CGV. [en] REDUCTION OF THE EMISSIONS IN GAS DIESEL GENERATORS. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2011. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=17166

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

University of Lund

28. Henningsson, Maria. Data-Rich Multivariable Control of Heavy-Duty Engines.

Degree: 2012, University of Lund

URL: https://lup.lub.lu.se/record/2439853 ; https://portal.research.lu.se/ws/files/3068636/2439874.pdf

► The combustion engine is today the dominant technology for transportation of goods and people world-wide. Concerns for global warming, toxic exhaust emissions, as well as… (more)

▼ The combustion engine is today the dominant technology for transportation of goods and people world-wide. Concerns for global warming, toxic exhaust emissions, as well as cost and availability of fuel have in recent years created incentives for technological evolution of combustion engines. More sophisticated engine instrumentation with additional degrees of freedom has been added to the engine design to reduce emissions and fuel consumption. But, as engines become more complex, the task of calibration and control becomes more challenging. This thesis investigates approaches to utilize rich sensor information for multivariable engine control. Different combustion modes, and different combinations of sensors and actuators have been studied and evaluated experimentally on a full-scale six-cylinder heavy-duty engine. The work is divided into four areas: virtual emissions sensing, dynamic emissions models, optimal engine control, and control of sensitive combustion modes. The theme of the thesis is to show how feedback control based on rich sensor information can be exploited to improve the engine operation and reduce the off-line calibration effort. The virtual sensing work presents a data-mining method for predicting exhaust emissions from cylinder pressure data. Principal component analysis was used to reduce the dimensionality of the high-resolution data, and a neural network model was trained to predict emissions on a cycle-to-cycle, cylinder-individual basis. The work on dynamic models investigates how system identification can be used to find multivariable dynamic models from a set of engine actuators to a set of variables related to high-level engine specifications, namely emissions, work output, combustion phasing, and peak pressure derivative. It was shown how fairly simple Wiener models can capture the main dynamics of the engine at a grid of operating points. One of the identified multivariable models was used for optimal control of the engine. In contrast to most previous work in the field, integration of fuel- and gas-path control into a single framework was pursued. A model predictive controller was designed based on a cost function expressed in terms of high-level engine control objectives, and feedback was based on measured emissions as well as cylinder pressure data. The final part of the thesis presents work on two sensitive combustion modes, HCCI and dual-fuel operation. Here, feedback control is necessary to achieve robust operation. For both types of combustion, it was shown how a combination of two actuators can be used to successfully control the combustion process.

Subjects/Keywords: Control Engineering; Multivariable Control; Model Predictive Control; LQG Control; Virtual Sensing; System Identification; Diesel engines; HCCI engines; Dual-Fuel Combustion; Cylinder Pressure Sensors

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

APA (6^th Edition):

Henningsson, M. (2012). Data-Rich Multivariable Control of Heavy-Duty Engines. (Doctoral Dissertation). University of Lund. Retrieved from https://lup.lub.lu.se/record/2439853 ; https://portal.research.lu.se/ws/files/3068636/2439874.pdf

Chicago Manual of Style (16^th Edition):

Henningsson, Maria. “Data-Rich Multivariable Control of Heavy-Duty Engines.” 2012. Doctoral Dissertation, University of Lund. Accessed February 27, 2021. https://lup.lub.lu.se/record/2439853 ; https://portal.research.lu.se/ws/files/3068636/2439874.pdf.

MLA Handbook (7^th Edition):

Henningsson, Maria. “Data-Rich Multivariable Control of Heavy-Duty Engines.” 2012. Web. 27 Feb 2021.

Vancouver:

Henningsson M. Data-Rich Multivariable Control of Heavy-Duty Engines. [Internet] [Doctoral dissertation]. University of Lund; 2012. [cited 2021 Feb 27]. Available from: https://lup.lub.lu.se/record/2439853 ; https://portal.research.lu.se/ws/files/3068636/2439874.pdf.

Council of Science Editors:

Henningsson M. Data-Rich Multivariable Control of Heavy-Duty Engines. [Doctoral Dissertation]. University of Lund; 2012. Available from: https://lup.lub.lu.se/record/2439853 ; https://portal.research.lu.se/ws/files/3068636/2439874.pdf

29. Guteša Milana. Modelovanje procesa u gasnim turbinama za potrebe primene gasa iz gasifikacije biomase.

Degree: 2017, University of Novi Sad

URL: https://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija149994500125137.pdf?controlNumber=(BISIS)104879&fileName=149994500125137.pdf&id=10246&source=OATD&language=en ; https://www.cris.uns.ac.rs/record.jsf?recordId=104879&source=OATD&language=en

►

U okviru istraživačkog rada formiran je matematički model za simulaciju procesa transformacije energije u postrojenju gasne turbine pri sagorevanju gasova srednje ili niže toplotne… (more)

Subjects/Keywords: gasna turbina, simulacioni model, metoda proračuna, kosagorevanje,gas iz gasifikacije biomase; gas turbine, simulation model, dual fuel combustion, corn cob gasification gas

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

APA (6^th Edition):

Milana, G. (2017). Modelovanje procesa u gasnim turbinama za potrebe primene gasa iz gasifikacije biomase. (Thesis). University of Novi Sad. Retrieved from https://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija149994500125137.pdf?controlNumber=(BISIS)104879&fileName=149994500125137.pdf&id=10246&source=OATD&language=en ; https://www.cris.uns.ac.rs/record.jsf?recordId=104879&source=OATD&language=en

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):

Milana, Guteša. “Modelovanje procesa u gasnim turbinama za potrebe primene gasa iz gasifikacije biomase.” 2017. Thesis, University of Novi Sad. Accessed February 27, 2021. https://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija149994500125137.pdf?controlNumber=(BISIS)104879&fileName=149994500125137.pdf&id=10246&source=OATD&language=en ; https://www.cris.uns.ac.rs/record.jsf?recordId=104879&source=OATD&language=en.

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

MLA Handbook (7^th Edition):

Milana, Guteša. “Modelovanje procesa u gasnim turbinama za potrebe primene gasa iz gasifikacije biomase.” 2017. Web. 27 Feb 2021.

Vancouver:

Milana G. Modelovanje procesa u gasnim turbinama za potrebe primene gasa iz gasifikacije biomase. [Internet] [Thesis]. University of Novi Sad; 2017. [cited 2021 Feb 27]. Available from: https://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija149994500125137.pdf?controlNumber=(BISIS)104879&fileName=149994500125137.pdf&id=10246&source=OATD&language=en ; https://www.cris.uns.ac.rs/record.jsf?recordId=104879&source=OATD&language=en.

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

Council of Science Editors:

Milana G. Modelovanje procesa u gasnim turbinama za potrebe primene gasa iz gasifikacije biomase. [Thesis]. University of Novi Sad; 2017. Available from: https://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija149994500125137.pdf?controlNumber=(BISIS)104879&fileName=149994500125137.pdf&id=10246&source=OATD&language=en ; https://www.cris.uns.ac.rs/record.jsf?recordId=104879&source=OATD&language=en

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

30. Dwivedi, Umang. An experimental investigation of diesel-ignited gasoline and diesel-ignited methane dual fuel concepts in a single cylinder research engine.

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

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07032013-133320/ ;

► Diesel-ignited gasoline and diesel-ignited methane dual fuel combustion experiments were performed in a single-cylinder research engine (SCRE), outfitted with a common-rail diesel injection system… (more)

Subjects/Keywords: Dual fuel; diesel-gasoline; diesel-methane; single cylinder engine; combustion; low temperature combustion; natural gas

…rates at high loads. Some researchers have considered dual fuel combustion strategies [… …ignite in a CI engine. Three distinct phases of combustion in a dual fuel engine using diesel… …45 4.2.3 Fuel Conversion Efficiency and Combustion Efficiency ..............47 4.2.4… …53 4.3.3 Fuel Conversion Efficiency and Combustion Efficiency ..............55 4.3.4… …59 4.4.3 Fuel Conversion Efficiency, Combustion Efficiency and Emissions…

10 more images…

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

APA (6^th Edition):

Dwivedi, U. (2013). An experimental investigation of diesel-ignited gasoline and diesel-ignited methane dual fuel concepts in a single cylinder research engine. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-07032013-133320/ ;

Chicago Manual of Style (16^th Edition):

Dwivedi, Umang. “An experimental investigation of diesel-ignited gasoline and diesel-ignited methane dual fuel concepts in a single cylinder research engine.” 2013. Masters Thesis, Mississippi State University. Accessed February 27, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07032013-133320/ ;.

MLA Handbook (7^th Edition):

Dwivedi, Umang. “An experimental investigation of diesel-ignited gasoline and diesel-ignited methane dual fuel concepts in a single cylinder research engine.” 2013. Web. 27 Feb 2021.

Vancouver:

Dwivedi U. An experimental investigation of diesel-ignited gasoline and diesel-ignited methane dual fuel concepts in a single cylinder research engine. [Internet] [Masters thesis]. Mississippi State University; 2013. [cited 2021 Feb 27]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07032013-133320/ ;.

Council of Science Editors:

Dwivedi U. An experimental investigation of diesel-ignited gasoline and diesel-ignited methane dual fuel concepts in a single cylinder research engine. [Masters Thesis]. Mississippi State University; 2013. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07032013-133320/ ;

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Open Access Theses and Dissertations