Global ETD Search
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 149 for “"direct injection"”.
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Dynamics of Lean Direct Injection Combustors
… temperatures, and thus more NOx production. Lean Direct Injection (LDI) is a combustion scheme that was proposed by NASA, and inherently addresses the needs of both the private sector and the military. LDI is a liquid fueled combustor that promotes rapid mixing of fuel and air at the entrance of …
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Multihole injectors for direct-injection gasoline engines
… technology, are believed to be promising Fuel Injection Equipment (FIE) for Direct-Injection (DI) Spark Ignition (SI) gasoline engines. Having explored thoroughly swirl pressure atomisers and their spray behaviour, multi-hole nozzles represent the second-generation injectors. Thus, complete …
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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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Pyrolysis-gas chromatography by direct injection of solutions
… new technique of pyrolysis-gas chromatography by direct injection of solutions was developed. By handling the samples in dilute solution it was shown that a much smaller sample could be pyrolyzed such that the probability or secondary reactions was greatly reduced. Also the very small samples …
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Dual fuel conversion of a direct-injection diesel engine
… completely original, including the diesel fuel injection system. Also, for the sake of simplicity, the method of intake manifold fumigation through an IMPCO, Inc. electronic natural gas control valve was chosen to deliver the CNG. A microprocessor-based electronic control unit was developed to …
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A Five-Zone Model for Direct Injection Diesel Combustion
… conceptual model of the internal structure of direct injection diesel fuel jets as well as empirical correlations predicting jet development and structure. This information was used to create a diesel cycle simulation model using C language including compression, fuel injection and combustion, …
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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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Implementation and stratup of a centrifugal direct injection rocket engine
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
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Evaluation Of Nozzle Geometry On High Pressure Gasoline Direct Injection Spray Atomization
… 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 varying …
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Autoignition and emission characteristics of gaseous fuel direct-injection compression-ignition combustion
… and high unburned fuel emissions. Natural gas direct-injection engines offer the potential of diesel-like efficiencies, but require further research. To improve understanding of the autoignition and emission characteristics of natural gas direct-injection compression-ignition combustion, the …
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Numerical Analysis of Biodiesel Combustion in a Direct Injection Compression Ignition Engine
… reaction within an optical Sandia/Cummins N14 direct-injection compression ignition engine are conducted. First, validation of the spray model against liquid and vapor penetration data was conducted using a trial and error method. Secondly, the overall engine model was validated against …
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Assessing the hydrocarbon emissions in a homogeneous direct injection spark ignited engine
… of researching hydrocarbon (HC) emissions in a direct-injection spark ignited (DISI) engine, five experiments were performed. These experiments clarified the role of coolant temperature, injection pressure, and injection timing in HC emissions; the final two experiments illustrated the effect of …
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Hydrocarbon emissions in a homogeneous direct-injection spark engine : gasoline and gasohol
… of loading, engine temperature, fuel type, and injection timing, a series of experiments was performed. The effect of loading was observed by running the engine at a higher temperature and more open throttle than would typically be observed at fast idle or low load driving. The effects of …
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Effects of different fuels on a turbocharged, direct injection, spark ignition engine
… 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 …
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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.
… 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 current …
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CFD investigation on hydrogen enrichment effect to dual-fuel direct injection diesel engine
… hydrogen-natural gas blends (HCNG) used port injection and experimentally were conducted. The use of Computational Fluid Dynamics (CFD) simulations in analyzing the effect of adding (0 - 90) % hydrogen to blend fuel and varying the equivalence ratio (0.6-1.4) on the combustion and exhaust …
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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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Soot formation in direct injection spark ignition engines under cold-idle operating conditions
Direct injection spark ignition engines are growing rapidly in popularity, largely due to the fuel efficiency improvements in the turbo-downsized engine configuration that are enabled by direct injection technology. Unfortunately, direct injection spark ignition engines also emit higher …
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Evaluation of the environmental viability of direct injection schemes for ocean carbon sequestration
… schemes for ocean carbon sequestration by direct injection of CO2, and serves as an update to the assessment by Auerbach et al. (1997) and Caulfield et al. (1997) of water quality impacts and the induced mortality to zooplankton. The present work extends the methodology used in the earlier …
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