The Effect of Pre-mixture Homogeneity on HCCI Combustion

Abstract

In this study, the effect of pre-mixture homogeneity on the combustion process in HCCI engine was investigated. Spontaneous luminescence from DME/Air mixture combustion was captured by using a framing streak camera with a 4-stroke optical access engine. In order to change spatial distribution of fuel in combustion chamber, the engine has two different fuel injection port and fuel injection timing was controlled by a gas injector. The result showed a heterogeneous combustion with a special variation in case of heterogeneously premixed charge. As combustion duration in heterogeneous condition is longer than homogeneous condition and combustion efficiency was almost constant in both conditions, it was clarified that heterogeneously premixed charge attracted slow combustion.