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Effect of Ambient Pressure and Injection Pressure on Mixture Formation of Diesel Spray
Published May 23, 2012 by Society of Automotive Engineers of Japan in Japan
In a direct injection diesel engine, ambient pressure in the combustion chamber tends to increase because of high boost and high EGR ratio. It seems that mixing process under extremely high compressed air condition such as high boost engine might be different from that under the conventional engine condition. In this study, time-resolved particle image velocimetry (PIV) was applied to velocity measurement inside a spray, and effect of ambient pressure and injection pressure on mixture formation of fuel and air was investigated. As the result, it was clear that spray width increased with increasing ambient gas density and injection pressure. Moreover local position of mixing layer shifted from periphery to spray inside with an increase of ambient gas density and injection pressure.