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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 32 for “"Fuel Injector"”.
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Adjoint-based geometry optimisation with applications to automotive fuel injector nozzles
Methods of Computational Fluid Dynamics (CFD) have matured, over the last 30 years, to a stage where it is possible to gain substantial insight into fluid flow processes of engineering relevance. However, the motives of fluid dynamic engineers typically go well beyond the level of improved …
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Development and Testing of an Integrated Liquid-Fuel-Injector/Plasma-Igniter for Scramjets
A newly designed liquid fuel (kerosene) aeroramp injector/plasma igniter was tested in cold flow using the Virginia Tech supersonic wind tunnel at Mach 2.4. The liquid fuel (kerosene) injector is flush wall mounted and consists of a 2 hole aeroramp array of impinging jets that are oriented in a …
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Experimental Investigation of a Flush-Walled, Diamond-Shaped Fuel Injector for High Mach Number Scramjets
… investigation of a flush-wall, diamond-shaped injector was conducted in the Virginia Tech supersonic wind tunnel. The diamond injector was elongated in the streamwise direction and is aimed downstream angled up at 60° from the wall. Test conditions involved sonic injection of helium heated to …
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Modeling of Air-Assisted and Flash Boiling Sprays in Gasoline Direct Injection Engines
… 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, but flash boiling may be more cost-effective for the automotive industry. The modeling methods …
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A Study of Plasma Ignition Enhancement for Aeroramp Injectors in Supersonic Combustion Applications
… of a low-power, uncooled plasma torch into a fuel injector array. The potential application was for an integrated scramjet igniter/injector, with the hope of producing superior mixing and flameholding performance for supersonic combustion applications. To create a knowledge base for …
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A finite element approach for the implementation of magnetostrictive material terfenol-D in automotive CNG fuel injection actuation
… parameters required for fast control of fuel injector valves for decreased engine emissions and lower fuel consumption compared with the traditional solenoid fuel injection system. A prototype CNG fuel injector assembly was designed, which primarily included magnetostrictive material …
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Design and Experimental Characterization of Electrostatically Assisted Automotive Fuel Injectors
With current automotive fuel injector designs, fuel mass and momentum cannot be independently controlled during engine operation. By introducing electrostatic charge to the fuel as it is injected, a means of altering the injector spray pattern without changing the mass injected is available. A …
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Design, setup of an optically accessible internal combustion engine for study of gasoline direct injection combustion
… 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 combustion. The optical engine was originally designed and used as a …
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Evaluation of a Strut-Plasma Torch Combination as a Supersonic Igniter-Flameholder
… responds to changes in the mass flow rate of fuel and the power to the plasma torch. The key conclusions of the work were the following: 1. Tests showed that an exothermic reaction takes place. 2. The amount of heat release increases with an increase in the mass flow rate of fuel. 3. The …
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An investigation into the effects of diesel fuel properties on the injection characteristics of a common rail injection system
… set out to investigate the effects of diesel fuel properties on the behaviour of a common rail fuel injection system, with particular emphasis on the injection rate shape characteristics. The investigation included the design and commissioning of experimental equipment for the measurement of …
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Combustion, Ionization And Sporadic Pre-Ignition In A Turbocharged Gasoline Direct Injection Engine.
… combustion sensors: the spark plug and the fuel injector. The characteristics of the ion current signals produced by the two sensors are analyzed and correlated with the characteristics of the rate of heat release computed from the cylinder gas pressure. Since this is the first time for the …
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Comprehensive Modeling and Numerical Investigation of Entrained-Flow Coal Gasifiers
… volatiles. The investigation of heat transfer on fuel injectors shows that blunt tip fuel injector is less likely to fail compared to conical tip fuel injector because the maximum high temperature on the injector is scattered. Two concentric fuel/oxidant injections provide better fuel-oxidant …
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Ignition and flameholding in supersonic flow by injection of dissociated hydrogen
… ignition and flameholding source for hydrogen-fueled Mach 2 flows at total temperatures as low as 1065 R, the lowest temperature tested. A reduction in the minimum total temperature required for ignition of several hydrocarbon fuels was also demonstrated. A piloted fuel injector configuration …
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Intake flow analysis of a pulsed detonation engine
… a primitive intake manifold system with a single fuel injector located approximately 10 feet upstream of the primary intake valve. Constant fuel mass flow rate at the injector end creates local variations in equivalence ratio throughout the PDE that may have significant impact on overall engine …
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Spray visualization and characterization of a multi variable circular orifice (MVCO) injector coupled with a swirl adapter for diesel reformer applications
The fuel spray generated by the injector is of primary importance to mixing and hence, combustion efficiency, due to the extremely short time scale of the combustion event inside an internal combustion engine. In this respect, the aim of the fuel injection system is to atomize the fuel droplets as …
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Experimental investigations into high-altitude relight of a gas turbine
… due to the large quantities of liquid fuel that impinge on the combustor walls during relight. Advances are made in the application of planar laser-induced fluorescence (PLIF) to monitor fuel placement in a combustor under these conditions. A novel apparatus is developed to deliver a …
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Ionization in diesel combustion: Mechanism, new instrumentation and engine applications
<p>Diesel engines are known for their superior fuel economy and high power density. However they emit undesirable high levels of nitrogen oxide (NOx) and black particulate smoke (Soot). To reduce these emissions, close loop engine control strategies are required. Therefore, there is a need for an …
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Feedback control of transient smoke emissions from compression ignition engines
… an understanding of the sampling action of the fuel injector on a diesel engine and utilizes a synchronization technique for acquiring the information of the engine dynamics. Parameter estimation was used to derive the models of speed-to-fuel rack and smoke-to-fuel rack. The nonlinearity of the …
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Ram-jet combustion based on shock/flame interaction
… strength on the base pressure of an axisymmetric fuel injector. Both peripheral bleed and axial bleed of hydrogen fuel have been examined and the effect of shock compression on the resulting flame has been determined. In the axial bleed case nitrogen and hydrogen bleed without combustion has also …
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