Role of Two-stage Fuel Injection in a Gasoline-fueled Compression Ignition Engine

Abstract

Controlled auto-ignition and mild combustion have been achieved in a gasoline compression ignition engine by two-stage fuel injection. To develop an understanding of the effect of interaction between intermediate products yielded from 1st and 2nd injections on ignition processes, simple one-dimensional modeling was performed while taking into account the detailed chemistry. Also, the effect of stratified-charge distribution due to two-stage injection on overall heat release rate was investigated by employing three-dimensional CFD and chemical reaction model. The results concluded that the intermediate products yielded from 1st injected fuel are entrained into 2nd injected spray and play an important role in enhancement of chemical reaction rather than supplying heat. It was also concluded that the amount of richer mixture should be reduced and that of leaner mixture should be increased to achieve staged mild combustion.