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Mixture Formation of DISI Engine With a Central Located Injection by Using LIF
Published September 28, 2005 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
Mixture formation process and quantitative mixture distribution in a direct injection spark ignition engine were investigated by using LIF. For stratified charge combustion, one of the ideal stratified mixture distributions is thought to be homogeneous inside with clear boundary for ambient air. The way to accomplish this mixture distribution is proposed. High-pressure fuel injector (up to 100 MPa) was installed at the center of combustion chamber and fuel was injected toward a cavity on the piston. Circulating flow was produced by fuel itself in the piston cavity, and this flow greatly contributes to mixing fuel and air. It was clarified that higher pressure fuel injection is more effective to get a uniform stratified mixture distribution and also to prevent fuel film from sticking on the piston surface. Quantifying procedure is described briefly.