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Enhancement of fuel and air mixing has been identified as an important mechanism for lowering emissions and improving engine efficiency in direct injection large bore natural gas engines. High-pressure fuel injection is a proven method for accomplishing this. It will like be an important technology in meeting future emissions regulations. Testing at Colorado State's Engines and energy Conversion Laboratory (EECL) has documented the effects of high-pressure fuel injection on engine performance with engine testing on a Cooper-Bessemer GMV-4TF and on the characteristics of the fuel valve jet using planar laser induced fluorescence and computational fluid dynamics. Although the results to date are very promising, there is much room for improvement. This development is performed using high-pressure fuel injection valve manufactured by Hoerbiger Corporation of America. New fuel valve nozzles are designed using the Method of Characteristics and closed-form design equations. Five different nozzle designs are developed which are the converging-diverging, Aerospike (adapted from rocket nozzles), 15o conical, 30o conical and 45o conical nozzles. Computational fluid Dynamics is implemented to evaluate the nozzles numerically by evaluating total momentum and average kinetic energy across planes downstream of the nozzles. Comparisons are made with the nominal nozzle provided with the fuel valve. The fuel valve nozzles are also evaluated in a motored optically accessible large bore engine with Planar Laser Induced fluorescence. In this technique, the gas injected is seeded with acetone. A Nd:YAG laser operated in the 4th harmonic (266 nm light) is implemented to create a laser sheet that passes through the cylinder. When acetone is radiated with the laser light, it fluoresces in the visible range. Images of fuel injection and mixing are captured with an Intensified CCD camera. Indicators used to evaluate the nozzles are shock wave formation, plume penetration, plume shape, mixture
Your Price $195.00
List Price $195.00