유사차원해석을 이용한 균일혼합기 GDI 엔진에서의 배기 및 노킹 예측

Prediction of Emissions and Knocking in a Homogeneous GDI Engine by Quasidimensional model

A quasidimensional model is developed with the surrogate mechanism of isooctane and n-heptane to predict knock and emissions of a homogeneous GDI engine. It is composed of unburned and burned zone with the latter divided into multiple zones of equal mass to resolve temperature stratification. Validation is performed against measured pressure traces, NOx and CO emissions at different load and rpm conditions. Comparison is made between the empirical knock model and predictions by the chemistry model in this work.