A Numerical Study of the Effects of Boost Pressure and EGR Ratio on the Combustion Process and Exhaust Emissions in a Diesel Engine 18ICES/062
Authors
Sang-kyu Kim - Osaka City University
Tomoyuki Wakisaka - Osaka City University
Yuzo Aoyagi - New A.C.E. Institute Co., Ltd.
Abstract
The main purpose of this study is to investigate the effects of the boost pressure and EGR ratio on the combustion process and exhaust emissions in a direct-injection diesel engine by means of three-dimensional numerical analysis. The combustion processes under various conditions of boost pressure and EGR ratio in a research diesel engine have been numerically simulated using the authors GTT code, and the in-cylinder local gas states obtained by calculation have been plotted on (equivalence ratio) T (temperature) maps to investigate NO and soot emission characteristics. By comparing the calculated results with the experimental ones, it has been confirmed that the cylinder gas pressure, the rate of heat release and the NO emission can be predicted reasonably well and the soot emission tendency can be estimated on the basis of -T maps.