Abstract
In order to achieve further improvement in the thermal efficiency of diesel combustion, it is necessary to identify the factors which suppress fuel-air mixture formation for achieving higher heat release rate and shorter combustion period. In this study, the effect of spray flame interference with adjacent flames and backflow of burnt gas on each spray flame were investigated by utilizing a bottom view transparent engine which can directly observe spray flame in the combustion chamber, and a numerical simulation. And it was revealed that those are the major factors for limiting the increase in heat release rate and prolonging after burning period with spatial constraints of the real engine.
