Improvement in Heat Release Rate Control and Exhaust Emission Characteristics of a Diesel Engine Based on the Temporal and Spatial Analysis of In-cylinder Flame Behavior

Abstract

It is important to control heat release rate profile more precisely for the concurrent improvement in cycle efficiency and each energy loss in a diesel engine, which was numerically and experimentally confirmed with the newly developed multiple-injector diesel engine in the previous paper. In this study, flame behavior with the multiple-injector concept was analyzed in detail by means of numerical simulation and in-cylinder flame observation technique aiming further improvement in cycle efficiency and exhaust emission characteristics. The experiments were then carried out by the revised nozzle specifications, and confirmed their effect on the combustion and emission characteristics.