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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"Gasoline direct injection"”.
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Injector deposit formation in gasoline direct injection engines
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
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Evaluation Of Nozzle Geometry On High Pressure Gasoline Direct Injection Spray Atomization
… of injector nozzle geometry on high-pressure Gasoline Direct Injection, GDi, injector spray morphology. The study was conducted with the aid of multi-fluid Volume-of-Fluid, Large-Eddy-Simulation, VOF-LES, method. Alternative nozzle geometries, that are the subject of current interest including …
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PLIF investigation of the fuel distribution in gasoline direct injection fuel sprays
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Combustion, Ionization And Sporadic Pre-Ignition In A Turbocharged Gasoline Direct Injection Engine.
… of the combustion process in turbocharged gasoline direct injection engines. A GM 2.0 L Ecotec GDI-T engine is used in this investigation. The ion current is measured simultaneously by two in-cylinder combustion sensors: the spark plug and the fuel injector. The characteristics of the ion …
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Modeling of Air-Assisted and Flash Boiling Sprays in Gasoline Direct Injection Engines
Impingement simulations were made for air-assisted sprays and flash boiling sprays. Both the air-assisted sprays and flash boiling sprays reduced fuel impingement substantially compared with a conventional GDI fuel injector. The air-assisted fuel injector produced the softest sprays in this study, …
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Investigations on the pollutant emissions of gasoline direct injection engines during cold-start
… more stringent, the turbocharged downsized gasoline direct injection (GDI) engine provides a mature platform to achieve better fuel economy. For this reason, it is expected that the GDI engine will capture increasing shares of the market during the coming years. The in-cylinder liquid …
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Combustion and soot formation modelling in modern gasoline direct injection engines using computational fluid dynamics
… model the formation of soot precursors in modern direct injection gasoline engines, with a particular emphasis on statistically efficient calibration of key sub-models. The research addresses the challenges associated with accurately representing combustion processes, liquid fuel films on cylinder …
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Design, setup of an optically accessible internal combustion engine for study of gasoline direct injection combustion
Gasoline direct injection (GDI) engines are becoming attractive options for automobiles. The precise control over fuel delivery increases the potential for better fuel efficiency and higher performance. In this study, a single-cylinder optically-accessible engine was built to visualize GDI …
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CFD Modelling of the Mixture Preparation in a Modern Gasoline Direct Injection Engine and Correlations with Experimental PN Emissions
A detailed 3D CFD analysis of a modern gasoline direct injection (GDI) engine is carried out to reveal the connections between pre-combustion mixture indicators and PN emissions. Firstly, a novel calibration methodology is introduced to accurately predict the widely used characteristics of the …
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Development and applications of two and three component particle image velocimetry techniques for simultaneous measurement in multi-phase flows and automative fuel sprays
… air and fuel velocimetry measurements in a Gasoline Direct Injection spray for which a more detailed understating of the interaction mechanisms is required to generate improved designs. The modified imaging system and experimental setup are presented and previously unavailable simultaneous …
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Computational Investigation of Ethanol and Bifuel Feasibility in Solstice Engine
A Gasoline Direct Injection (GDI) engine enables an increased fuel efficiency and higher power output than a conventional Port Fuel Injection (PFI) system. By injecting pressurized fuel straight into each cylinder of an internal-combustion engine, the degree of fuel atomization is increased, as …
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Fuel spray modelling in direct-injection diesel and gasoline engines
… flow development from high-pressure fuel injection systems for modem diesel and gasoline direct injection engines, the Eulerian-Lagrangian stochastic methodology, which models the air/vapour mixture as continuous phase and the liquid droplets as the dispersed one, has become standard among …
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Developing an accelerated aging system for gasoline particulate filters and an evaluation test for effects on engine performance
… level of particulate matter (PM) emitted from gasoline engines equipped with direct fuel injection. Gasoline particulate filters (GPFs) present one strategy for meeting PM limits over the full operating range of the engine. Over time these filters accumulate incombustible ash, increasing system …
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Effect of market fuel variation and cetane improvers on CAI combustion in a GDI engine
… Auto Ignition (CAI) combustion. The lack of direct combustion control makes control of CAI combustion challenging. Practical implementation of CAI an engine, the engine's behavior must be predictable. This work investigates the impact of market fuel composition variation and cetane improver …
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Ash impacts on gasoline particulate filter performance and service life
… gas emissions, are causing increased use of gasoline direct-injection (GDI) engines in light-duty vehicles (LDV). Separate new regulations that aim to reduce particulate emissions to address air pollution concerns are taking effect concurrent with greenhouse gas limitations in both …
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Combustion characteristics of synthetic gasoline in modern charge boosted GDI Engines
Sasols synthetically derived gasoline blending components have traditionally been combined predominantly according to process economics to formulate commercial fuel blends that meet in-house fit-for-purpose requirements and the legislated fuel specifications in South Africa. In this study the …
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Combustion Visualization And Particulate Matter Emission Of A Gdi Engine By Using Gasoline And E85
… challenge in research and product development. Gasoline direct injection (GDI) engines have been popularized due to its higher power density, fuel efficiency, and the possibility for advanced engine technologies over conventional port-fuel-injection (PFI) gasoline engines. However, many issues …
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Modeling of droplet evaporation, flash-boiling, and mixture preparation in internal combustion engines
… by simulating the operation of a swirl-dominant gasoline direct-injection engine. As the concluding remark, this study develops not only mixture preparation models that predict the mixture preparation outcome, but also combustion models that assess the combustion’s dependency on the mixture …
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Combustion quality and regimes for standard and alternative fuels
… have shown to be a possible alternative to pure gasoline. In this work, the intermediate product in bio-butanol production through acetone-butanol-ethanol (ABE) fermentation, ABE, was studied for the first time as a potential alternative fuel in spark ignition (SI) engines. Various blends of ABE …
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