A theoretical model for instantaneous PLIF measurements of mole fraction in a shock tunnel ow with pressure gradients and large temperature variations is presented. The model determined the optimum excitation frequency which provided PLIF signal intensity proportional to freestream mole fraction. Experimental PLIF images of a two-dimensional slot scramjet injector with and without hydrogen fuel...

Control over drop size distributions, injection rates, and geometrical distribution of fuel and oxidizer sprays in bi-propellant rocket engines has the potential to produce more efficient, more stable, less polluting rocket engines. This control also offers the potential of an engine that can be throttled, working efficiently over a wide range of output thrusts. Inkjet printing technologies, ME...

Major pollutants emission from Direct-Injection (D.I) diesel engines are predicted by means of a mathematical model. In order to construct such a model, an integral Multi-Zone Combustion Model (MZCM) is formulated, which basically consists of jet mixing and combustion submodels. In MZCM, variation of injection pressure is considered. Also time period of ignition delay is predicted by considerin...

in order to present a new and high performance structure of pem fuel cell and study the influence of the flow direction and distribution on the rate of reactants diffusion, three novel models of vertical reactant flow injection into the anode and cathode reaction area field have been introduced. they consist of one inlet and two inlets and also a continuous channel. the governing equations on t...

The spark energy transferred under the highly stratified conditions during late injection in a spray-guided spark-ignition direct-injection (SG-SIDI) engine is not well characterized. The impact of high pressures, temperatures, velocities, and variations in local fuel concentration along with temporal and/or spatial variations on spark performance must be better characterized. Previous spark ig...

the preparation of air–fuel mixture is considerably dependent on fluid flow dynamics to achieve improved performance, efficiency, and engine combustion in the appearance of flow. in this study, the effects of mixtures of hydrogen and compressed natural gas (cng) on a spark ignition engine are numerically considered. this article presents the results of a direct-injection engine using methane–hy...

The present study analyzes the heat release and combustion characteristics of diesel, pure biodiesel (B100) obtained from Jatropha oil and its 80% blending with Ethanol (BD80E20) and Acetone (BD80AC20) as fuels in a single cylinder four stroke direct injection (DI) diesel engine. The analyses of experimental results indicate that the pressure of the in-cylinder gases rise early in case of B100,...

nitrogen oxides (nox) contribute to a wide range of environmental effects including the formation of acid rain and destroy ozone layer. in-cylinder high temperature flame and high oxygen concentration are the parameters which affect the nox emissions. the egr system is a very effective way for reducing nox emission from a diesel engine (via reduction of these parameters), particularly at the hi...

Electrinic Fuel Injection (EFI) a system that supplies fuel from the tank electronically with mixture of air suits needs so vehicle power remains maximum minimal consumption to produce environmentally friendly emissions. The injection is an innovation step being developed and applied motor vehicles today. purpose study was find out characteristics 2007 Honda Jazz I-DSI engine using parameters t...

The quest for alternatefuels for a CI engine has become all the more imperative considering its importance in the economy of a nation and from the standpoint of preserving the environment. Reported in this paper are the combustion performance and P-θ characteristics of a CI engine operating on B20 biodiesel fuel derived from Jatropha oil.Itis observed that the twin effect of advancing the injec...