Дисертації з теми "Ignition engine- Alternative fuels"
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Toulson, Elisa. "Applying alternative fuels in place of hydrogen to the jet ignition process /." Connect to thesis, 2008. http://repository.unimelb.edu.au/10187/3532.
Повний текст джерелаIslam, Muhammad Aminul. "Microalgae: An alternative source of biodiesel for the compression ignition (CI) engine." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/79551/4/Muhammad%20Aminul%20Islam%20Thesis.pdf.
Повний текст джерелаImran, Shahid. "Experimental and numerical investigation of performance and emissions in compression ignition engines with alternative fuels." Thesis, Queen Mary, University of London, 2013. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8505.
Повний текст джерелаCambridge, Shevonn Nathaniel. "The effect of compression ratio on emissions from an alcohol-fueled engine." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09122009-040220/.
Повний текст джерелаSurawski, Nicholas C. "An investigation of gaseous and particulate emissions from compression ignition engines operated with alternative fuels, injection technologies, and combustion strategies." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/54194/1/Surawski_Thesis_2011.pdf.
Повний текст джерелаBodisco, Timothy Alexis. "In-cylinder pressure and inter-cycle variability analysis for a compression ignition engine : Bayesian approaches." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/62064/11/Timothy_Bodisco_Thesis.pdf.
Повний текст джерелаLezzar, Balahouane. "Contribution à l'étude de la combustion et des limites de fonctionnement dans un monocylindre à taux de compression variable alimenté au méthane, au gaz de groningue et avec un mélange méthane-éthane." Valenciennes, 1987. https://ged.uphf.fr/nuxeo/site/esupversions/0d1a9c0a-0df4-4fab-8206-316c90031798.
Повний текст джерелаBari, Saiful. "Alternative fuels in diesel engine." Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303788.
Повний текст джерелаKenny, Wilhelm Jordaan. "Development of an engine testing facility for spark ignition engine fuels." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80043.
Повний текст джерелаENGLISH ABSTRACT: This thesis comprises of the development of a facility were spark ignition engine fuels can be tested. Development of the facility included the installation of a standard spark ignition engine, an engine dynamometer, control and monitoring equipment, control and monitoring software, and an in-cylinder pressure measurement setup. The system was tested using petrol as well as a petrol-ethanol blend. The results indicated good accuracy and repeatability of the system. Analysis of the performance and combustion of the petrol-ethanol blend showed no significant difference in comparison to the petrol fuel. The petrol-ethanol blend showed a slight increase in oxygen content and fuel consumption as well as an increase in CO2 emissions and a decrease in CO emissions. During the project, a comparison was also made between the performance of fibre optic transducers and a piezoelectric transducer. It was found that the fibre optic transducers performed similarly to the piezoelectric transducer during low engine load conditions. At high load conditions however, the fibre optic transducers were not able to produce the same accuracy as the piezoelectric transducer.
AFRIKAANSE OPSOMMING: Hierdie tesis bestaan uit die ontwikkeling van 'n fasiliteit waar brandstowwe vir 'n vonkontsteking binnebrandenjin getoets kan word. Ontwikkeling van die fasiliteit sluit in die installering van 'n standaard vonkontsteking binnebrandenjin, 'n enjin rem, beheer en monitering toerusting, beheer en monitering sagteware, en 'n insilinder drukmeting opstelling. Die fasiliteit is getoets met suiwer petrol sowel as 'n petrol-etanol mengsel. Die resultate het hoë vlakke van akkuraatheid en herhaalbaarheid getoon. Ontleding van die werksverrigting en verbranding van die petrol-etanol mengsel het geen beduidende verskil getoon in vergelyking met die suiwer petrol brandstof nie. Die petrol-etanol mengsel het 'n effense toename in suurstofinhoud, brandstofverbruik, sowel as CO2 vrylating en 'n afname in CO vrylating getoon. Tydens die projek is 'n vergelyking getref tussen die akkuraatheid van optiese vesel drukmeters en 'n piësoëlektriese drukmeter. Daar is bevind dat die akkuraatheid van die optiese vesel drukmeters soortgelyk is aan die piësoëlektriese drukmeter gedurende lae enjin lastoestande. By hoë las omstandighede was die optiese vesel drukmeters egter nie in staat om dieselfde akkuraatheid as die piësoëlektriese drukmeter te handhaaf nie.
White, Timothy Ross Mechanical & Manufacturing Engineering Faculty of Engineering UNSW. "Simultaneous diesel and natural gas injection for dual-fuelling compression-ignition engines." Awarded by:University of New South Wales. School of Mechanical and Manufacturing Engineering, 2006. http://handle.unsw.edu.au/1959.4/25233.
Повний текст джерелаBaslamisli, Ufuk. "Helicopter Turboshaft Engine Ground Preformance With Alternative Fuels." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614098/index.pdf.
Повний текст джерелаRydalch, Andrew J. "Ignition delay properties of alternative fuels with Navy-relevant diesel injectors." Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/42715.
Повний текст джерелаIn support of the Navy’s Green Fleet Initiative, this thesis researched the ignition characteristics for diesel replacement fuels used with Navy-relevant fuel injectors. A constant-volume combustion chamber was used to simulate Top-Dead-Center conditions of a diesel engine using an ethylene-air preburn with appropriate make-up oxygen. The injection conditions ranged from temperatures of 1,000 K to 1,300 K and densities has high as 14.8 kg/m3. Hydrotreated renewable diesel (HRD) and direct sugar-to-hydrocarbon (DSH) fuels were injected into the combustion chamber using a Sturman research injector, a Yanmar injector, and an Electro Motive Diesel (EMD) injector. The primary means of data collection was optical emission imaging of laser induced fluorescence of the fuel and broadband emission of the combustion event. The ignition delay was determined using high speed imaging at 50 kHz to determine the time delay between start of injection and start of combustion. The results of the study show that the ignition delay characteristics for the F-76/HRD 50/50 blend are compatible with those of conventional F-76 diesel fuel for both the Yanmar and EMD injectors at the conditions tested. The ignition delay characteristics of the F-76/DSH 50/50 blend fuel for the Yanmar injector were also compatible with those of F-76.
Bundu, Mohamed Maurie. "Investigation of the performance of a spark ignition engine with gaseous fuels." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0011/MQ31551.pdf.
Повний текст джерелаNegrete, Justin E. "Effects of different fuels on a turbocharged, direct injection, spark ignition engine." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59952.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 65).
The following pages describe the experimentation and analysis of two different fuels in GM's high compression ratio, turbocharged direct injection (TDI) engine. The focus is on a burn rate analysis for the fuels - gasoline and E85 - at varying intake air temperatures. The results are aimed at aiding in a subsequent study that will look at the benefits of direct injection in turbocharged engines, ethanol's knock suppression properties, and the effects of ethanol concentration in gasoline/ethanol blends. Spark sweeps were performed for each fuel/temperature combination to find the knock limit and to assess each fuels' sensitivity to spark timing and temperature. The findings were that E85 has lower sensitivity to spark timing in terms of NIMEP loss for deviation from MBT timing. A 5% loss in NIMEP was seen at 3° of spark advance or retard for gasoline, whereas E85 took 5' to realize the same drop in NIMEP. Gasoline was also much more sensitive to intake air temperature changes than E85. Increasing the intake air temperature for gasoline decreased the peak pressure, however, knock onset began earlier for the higher temperatures, indicating that end-gas autoignition is more dependent on temperature than pressure. E85's peak pressure sensitivity to spark timing was found to be about 50% lower than that of gasoline and it displayed much higher knock resistance, not knocking until the intake air temperature was 130°C with spark timing of 30° bTDC. These results give some insight into the effectiveness of ethanol to improve gasoline's anti-knock index. Future experiments will aim to quantify charge cooling and anti-knock properties, and determine how ethanol concentration in gasoline/ethanol blends effects this knock suppression ability.
by Justin E. Negrete.
S.B.
Kim, Jong-Woo. "Flow, combustion and emissions in a four-valve spark-ignition engine fuelled by compressed natural gas." Thesis, Imperial College London, 2000. http://hdl.handle.net/10044/1/8064.
Повний текст джерелаMozafari-Varnusfadrani, Aliasghar. "Predictions and measurements of spark-ignition engine characteristics using ammonia and other fuels." Thesis, Queen Mary, University of London, 1988. http://qmro.qmul.ac.uk/xmlui/handle/123456789/1582.
Повний текст джерелаDaniel, Ritchie Lewis. "Combustion and emissions performance of oxygenated fuels in a modern spark ignition engine." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3675/.
Повний текст джерелаCrawford, Morgan H. "Feasibility and Emissions of Compression Ignition Engines Fueled with Waste Vegetable Oil." [Tampa, Fla.] : University of South Florida, 2003. http://purl.fcla.edu/fcla/etd/SFE0000193.
Повний текст джерелаKevric, Arman. "Combustion characteristics of a compression ignition engine running on biodiesel and gasoline blended fuels." Thesis, University of Nottingham, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.605993.
Повний текст джерелаNorouzi, Shahrouz. "Interaction of diesel type fuels and engine fuel system components in compression ignition engines." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5369/.
Повний текст джерелаGroenewegen, Jon-Russell Jacob. "The Performance and Emissions Characteristics of Heavy Fuels in a Small, Spark Ignition Engine." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1323369703.
Повний текст джерелаSilva, Isaac Alexander. "Onboard Hydrogen Generation for a Spark Ignition Engine via Thermochemical Recuperation." Thesis, University of California, Davis, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1585124.
Повний текст джерелаA method of exhaust heat recovery from a spark-ignition internal combustion engine was explored, utilizing a steam reforming thermochemical reactor to produce a hydrogen-rich effluent, which was then consumed in the engine. The effects of hydrogen in the combustion process have been studied extensively, and it has been shown that an extension of the lean stability limit is possible through hydrogen enrichment. The system efficiency and the extension of the operational range of an internal combustion engine were explored through the use of a methane fueled naturally aspirated single cylinder engine co-fueled with syngas produced with an on board methane steam reformer. It was demonstrated that an extension of the lean stability limit is possible using this system.
Whitelaw, David Stuart. "Droplet atomisation of Newtonian and non-Newtonian fluids including automotive fuels." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266620.
Повний текст джерелаVerma, Saket. "Experimental investigation and exergy analysis of a dual fuel engine using alternative fuels." Thesis, IITD, 2019. http://eprint.iitd.ac.in:80//handle/2074/8099.
Повний текст джерелаLiu, Quan. "Planar laser induced fluorescence imaging and analysis with ethanol blended fuels in a direct injection spark ignition engine." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/14786.
Повний текст джерелаUdell, Thomas Gregory. "Reducing emissions of older vehicles through fuel system conversion to natural gas." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/19896.
Повний текст джерелаMoxey, Benjamin. "A study of flame development with isooctane alcohol blended fuels in an optical spark ignition engine." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/9866.
Повний текст джерелаCarr, M. Aaron. "The Comparison of Hydrotreated Vegetable Oils With respect to Petroleum Derived Fuels and the Effects of Transient Plasma Ignition in a Compression-Ignition Engine." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/17333.
Повний текст джерелаThis thesis presents the results of an experimental study of the combustion characteristics of algae and camelina derived biofuels as well as the effects of Transient Plasma Ignition in a Compression-Ignition Engine. Testing was conducted for Hydrotreated Renewable Diesel, algae, and benchmarked against F-76 and Diesel #2 fuels as well as Hydrotreated Renewable Jet, camelina, benchmarked against JP-5 across a matrix of constant engine speeds and engine loads in a Detroit Diesel 3-53 legacy engine. A heat release rate analysis and a cycle analysis were performed at each matrix point. The algae and camelina fuels averaged 1.4 Crank Angle Degrees earlier ignition, 2 Crank Angle Degrees longer burn duration, 2.25 atmospheres decrease in Peak Pressure, 1.4 Crank Angle Degrees delay in Angle of Peak Pressure, 0.5 per cent increase in Indicated Mean Effective Pressure, and 6 per cent decrease in Break Specific Fuel Consumption than their petroleum counterpart. A comparison between Diesel #2 at idle was performed between Transient Plasma Ignition Assisted Compression-Ignition and conventional Compression-Ignition. Transient Plasma Ignition averaged a Crank Angle Degree earlier start of combustion, faster pressure rise, but lower Peak Pressures than Compression-Ignition. However, due to failure of the plasma electrode it was not ascertained if this phenomenon is repeatable.
Stousland, Tyler Brian. "Experimental Use of Hydrogen to Reduce the Consumption of Carbon Fuels in a Compression Ignition Engine and Its Effect on Performance." Thesis, North Dakota State University, 2016. https://hdl.handle.net/10365/27641.
Повний текст джерелаLi, Guoxing. "Investigation into the dynamic responses and tribological characteristics of cylinder liners in a IC engine with alternative fuels." Thesis, University of Huddersfield, 2016. http://eprints.hud.ac.uk/id/eprint/30287/.
Повний текст джерелаSinuka, Yonwaba. "Performance testing of a diesel engine running on varying blends of jatropha oil, waste cooking oil and diesel fuel." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2436.
Повний текст джерелаThe high cost of fossil fuels and the fact that the world has arguably reached its peak oil production, has driven the need to seek alternative fuel sources. The main objective of the current study is to determine the performance of a laboratory-mounted diesel engine when fuelled with varying laboratory prepared biofuel and biodiesel and whether the advancement of the injection timing parameters will improve the engine power output and improve the smoke effect of these different fuel blends. The laboratory prepared biofuels used in this project range from 100% bio-fuel (BF100) to 50%, 30% and 10% biodiesel blends (BF50, BF30 and BF10, respectively). It should be noted that these blends are not commercially available, since they were blended in the laboratory specifically for these tests. The overall results of the study show that there is a distinct opportunity for using certain bio-fuel blends in specific applications as the power outputs are no more than one quarter less than that of base diesel. Concomitantly, the smoke opacity in all of the blends is lower than that of base diesel, which is a significant benefit in terms of their overall air emissions.
Kapadia, Bhavin Kanaiyalal. "Development Of A Single Cylinder SI Engine For 100% Biogas Operation." Thesis, Indian Institute of Science, 2006. https://etd.iisc.ac.in/handle/2005/283.
Повний текст джерелаKapadia, Bhavin Kanaiyalal. "Development Of A Single Cylinder SI Engine For 100% Biogas Operation." Thesis, Indian Institute of Science, 2006. http://hdl.handle.net/2005/283.
Повний текст джерелаEverett, Ryan Vincent. "An Improved Model-Based Methodology for Calibration of an Alternative Fueled Engine." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1321285633.
Повний текст джерелаVittori, Ruggero Maria. "Experimental study on the effect of stoichiometric air/fuel ratio of three binary oxygenated fuel blends on combustion and emissions of a heavy duty Diesel engine." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18203/.
Повний текст джерелаGhomashi, 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." Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/7344.
Повний текст джерелаIbrahim, Umar. "Characterization of Biodiesel Blends Effects on Aftertreatment Systems and Aftertreatment-based Blend Level Estimation." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1451906418.
Повний текст джерелаBalagurunathan, Jayakishan. "Investigation of Ignition Delay Times of Conventional (JP-8) and Synthetic (S-8) Jet Fuels: A Shock Tube Study." University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1330351552.
Повний текст джерелаZinner, Christopher. "METHANE AND DIMETHYL ETHER OXIDATION AT ELEVATED TEMPERATURES AND PRESSURE." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3457.
Повний текст джерелаM.S.M.E.
Department of Mechanical, Materials and Aerospace Engineering
Engineering and Computer Science
Mechanical Engineering MSME
MANELLI, ANDREA. "Engine Technologies for Reduction of Fuel Consumption and Pollutant Emissions in Light-Duty Diesel Engines." Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2971996.
Повний текст джерелаŠmerda, Ondřej. "Návrh koncepce leteckého motoru na CNG." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401574.
Повний текст джерелаNevot, Cercós Javier. "Diseño de un controlador avanzado basado en redes neuronales para la gestión de la mezcla aire-gasolina en un motor alternativo." Doctoral thesis, Universitat Politècnica de Catalunya, 2000. http://hdl.handle.net/10803/5933.
Повний текст джерелаPara evitar estos problemas se ha diseñado un modelo matemático de un motor, que comprende todo el proceso de formación de la mezcla, sensores, la generación del par motor y la dinámica del vehículo. La realización final se ha realizado en el lenguaje de simulación MatLab/Simulink®. Los datos requeridos son fácilmente obtenibles bien por metrología, bien de forma experimental. Se ha validado con un motor SEAT de 1,6 l y 74 kW.
Como primer paso se ha aplicado una estrategia de control convencional bastante simple, consistente en un controlador feedforward estático, más un controlador feedback de tipo PI ó PID. Esto ha permitido el estudio de las principales características del motor desde el punto de vista de control.
Con los resultados obtenidos se ha diseñado un observador basado en una red neuronal, que elimine los retardos puros del sistema y que pueda ser utilizado para cerrar el lazo de control. Primero se ha usado una red feedforward, pero vistos los malos resultados, se ha desarrollado una red neuronal recurrente a partir de la red de Elman, que se ha modificado convenientemente para adaptarla a las dificultades propias del problema. El algoritmo de entrenamiento utilizado se basa en el de retropropagación clásico, y modifica no sólo los pesos entre capas, sino también los correspondientes a las neuronas de contexto, las cuales permiten memorizar estados internos. La principal mejora consiste en separar las neuronas de contexto en tantos grupos como entradas tiene la red, y entrenarlos por separado, de modo que cada grupo se adapte a la dinámica particular de la entrada a la que va asociado. Se muestra mediante simulación el comportamiento del conjunto motor más observador en lazo cerrado, y se compara con el esquema convencional. Se prueba asimismo la robustez del sistema frente a distintas consignas, ruido en la planta y defectos de sintonía.
In the present thesis a control system for the air-fuel mixture in a reciprocating four-stroke engine is developed, based on neural networks. The air-fuel ratio has to be kept within a very narrow window so that the catalyst achieves an acceptable degree of purification simultaneously with all the polluting gases. In steady state, this goal can be fulfilled without difficulties, but the usual operation of a vehicle is in a very transient state, where the conventional systems are not able to avoid important excursions from the set point. They also rely on a great number of look-up tables, which have to be tuned experimentally, thus with an enormous investment of money and time.
To avoid those problems a mathematical model of an engine has been designed, in such a way that it comprises of the whole mixture formation process, sensors, the torque generation and the vehicle dynamics. Finally it has been implemented in the simulation language MatLab/Simulink®. The required data is easily available both from metrology, and experimental work. It has been validated with a 1,6 litre 74 kW SEAT engine.
As a first step, a quite simple conventional control strategy has been applied, consisting of a static feedforward controller, and a PI or PID feedback controller. This has permitted studying the main features of the engine from the control point of view.
With the obtained results an observer based on a neural network has been designed, which eliminates the delays of the system and that can be used to close the control loop. First a feedforward network has been used, but due to the bad results, a recurrent neural network has been developed starting from the Elman network, which has been properly modified in order to adapt it to the characteristic difficulties of the problem. The training algorithm used is based on that of classical backpropagation, and it modifies not only the weights interconnecting different layers, but also those corresponding to the context neurons, which allow the memorising of internal states. The main improvement consists in separating the context neurons in as many groups as the network has inputs, and to train them separately, so that each group adapts to the particular dynamics of the input with which it is associated. The behaviour of the engine plus the observer in closed loop is shown by means of simulation, and is compared with the conventional scheme. It is proven the robustness of system response to different set points, noise in the plant and tuning defects.
Vinay, Kumar Nerella V. "An Analysis on Vehicular Exhaust Emissions from Transit Buses Running on Biodiesel Blends." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1271886446.
Повний текст джерелаGarimella, Venkata Naga Ravikanth. "Exhaust Emissions Analysis for Ultra Low Sulfur Diesel and Biodiesel Garbage Trucks." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1290203383.
Повний текст джерелаFagundez, Jean Lucca Souza. "Avaliação energética do uso de álcoois combustíveis em motores de combustão interna." Universidade Federal de Santa Maria, 2016. http://repositorio.ufsm.br/handle/1/10624.
Повний текст джерелаO presente trabalho investiga o uso de um modelo computacional de duas zonas para simular o funcionamento de um motor de combustão interna com ignição por centelha abastecido com álcoois combustíveis e gasolina. Para o ajuste do modelo fez-se uso de técnica de estimação de parâmetros e determinação da correlação de transferência de calor capaz de melhor se ajustar aos combustíveis e ao motor testados. Os combustíveis utilizados foram: etanol hidratado, etanol super-hidratado (de 10% a 40% de água, em volume), n-butanol, misturas de n-butanol e etanol e gasolina e etanol. Além dos testes experimentais com motor, testes de bancada com uma coluna de destilação recheada em regime descontínuo foram realizados a fim de determinar a eficiência energética do processo de produção e queima de etanol hidratado e super-hidratado. Os resultados obtidos mostraram que o modelo de duas zonas é capaz de prever de maneira satisfatória o comportamento de todos os combustíveis testados, com determinação precisa de parâmetros de desempenho do motor. Em termos de eficiência energética, o etanol super-hidratado tem vantagem em relação ao etanol hidratado combustível, em especial quando com 30% de água em volume, onde a eficiência energética é máxima, considerados os processos de destilação e queima no motor. O n-butanol combustível usado mostrou-se capaz de substituir eficientemente tanto o etanol hidratado como a gasolina brasileira, levando o motor a ter boa performance nas condições operacionais testadas e aparecendo, dessa forma, como interessante alternativa de combustível renovável a ser inserida na matriz energética brasileira.
Kumar, Ashok. "Study on ghg emissions in an automotive compression ignition engine using alternative fuels." Thesis, 2018. http://localhost:8080/xmlui/handle/12345678/7692.
Повний текст джерелаToulson, E. "Applying alternative fuels in place of hydrogen to the jet ignition process." 2008. http://repository.unimelb.edu.au/10187/3532.
Повний текст джерелаThe benefits from the low temperature combustion at λ = 2 and leaner are that almost zero NOx is formed and there is an improvement in thermal efficiency. Efficiency improvements are a result of the elimination of dissociation, such as CO2 to CO, which normally occurs at high temperatures, together with reduced throttling losses to maintain the same road power. It is even possible to run the engine in an entirely unthrottled mode, but at λ = 5.
Although only a small amount of H2 is required for the HAJI process, it is difficult to both refuel H2 and store it onboard. In order to overcome these obstacles, the viability of a variety of more convenient fuels was experimentally assessed based on criteria such as combustion stability, lean limit and emission levels. The prechamber fuels tested were liquefied petroleum gas (LPG), natural gas, reformed gasoline and carbon monoxide. Additionally, LPG was employed as the main fuel in conjunction with H2 or LPG in the prechamber. Furthermore, the effects of HAJI operation under sufficient exhaust gas recirculation to allow stoichiometric fuel-air supply, thus permitting three-way catalyst application were also examined.
In addition to experiments, prechamber and main chamber flame propagation modeling was completed to examine the effects of each prechamber fuel on the ignition of the main fuel, which consisted of either LPG or gasoline. The modeling and experimental results offered similar trends, with the modeling results giving insight into the physiochemical process by which main fuel combustion is initiated in the HAJI process.
Both the modeling and experimental results indicate that the level of ignition enhancement provided by HAJI is highly dependent on the generation of chemical species and not solely on the energy content of the prechamber fuel. Although H2 was found to be the most effective fuel, in a study of a very light load condition (70 kPa MAP) especially when running in the ultra-lean region, the alternative fuels were effective at running between λ = 2-2.5 with almost zero NOx formation. These lean limits are about twice the value possible with spark ignition (λ = 1.25) in this engine at similar load conditions. In addition, the LPG results are very encouraging as they offer the possibility of a HAJI like system where a commercially available fuel is used as both the main and prechamber fuel, while providing thermal efficiency improvements over stoichiometric operation and meeting current NOx emission standards.
Burke, PH. "Performance appraisal of a four-stroke hydrogen internal combustion engine." Thesis, 2005. https://eprints.utas.edu.au/19195/1/whole_BurkePatrickHugh2005_thesis.pdf.
Повний текст джерелаMazumder, Diya Basu 1974. "Essays in vehicle emission policies." Thesis, 2007. http://hdl.handle.net/2152/3154.
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(11208897), Shubham Pradeep Agnihotri. "EFFICIENCY IMPROVEMENT ANALYSIS FOR COMMERCIAL VEHICLES BY (I) POWERTRAIN HYBRIDIZATION AND (II) CYLINDER DEACTIVATION FOR NATURAL GAS ENGINES." Thesis, 2021.
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