Analysis of Heat Release Process during Late Combustion in a Diesel Engine

Abstract

The late combustion was visualized via high speed imaging of soot luminosity and UV chemiluminescence in a modern diesel engine. The mechanism of late combustion also was examined by 3-D RANS simulation. The phenomenon of late combustion in a diesel engine is the heat release occurs around the rich mixture at the spray tip, which is similar to the late combustion indicated by the single-shot diesel flame in a constant volume vessel. Engine experiments with an oxygenated fuel showed the fact that there was no significant effect of soot oxidation on the heat release of late combustion.