Reduction of Late Combustion Phase of Diesel Engine by Split Main Injections

Abstract

In the previous study, it was found that the late combustion at medium to high load operations is caused by a rich mixture that stagnated at the tip of the spray flame. However, the causal relationship between thermal efficiency and late combustion has not been well clarified. Therefore, in this study, the detail mechanism of late combustion reduction by the split injections and also the influence on thermal efficiency were investigated. As a result, it was revealed that late combustion was reduced by main split injections, as the rich mixture in both the inside and outside the cavity was suppressed.