抄録
The KIVA-Waseda code which is based on the KIVA-3V and added the KH-RT spray model, the PaSR combustion model and other sub-models can predict pressure and ROHR histories of new generation diesel engines with a high pressure common rail injection system for passenger cars. Exhaust emissions, NO and soot, however still can not be predicted within acceptable precision. Thus the PaSR model was changed to chemical equilibrium calculation with Livengood-Wu integral and NO and soot prediction models. This modification is favorable to estimate engine performance and exhaust emission levels in practical time and precision. It is underlined that the method of solving chemical equilibrium using chemical species maps is unique. And furthermore, the KIVA code is coupled with an engine simulator which includes one-dimensional intake and exhaust gas dynamics simulation. Then this computational system is able to predict complete pressure histories during intake, compression, expansion and exhaust cycles, and eventually enables to figure out the engine performance by IMEP. The calculation results and the overview of the calculation system are shown here.
