用改进的多区模型计算柴油机中的燃烧和排放

在广安博之直喷式柴油机多区燃烧模型的基础上，改进了燃油雾滴的运动和蒸发模型，以及碳烟的生成与氧化模型，增加了缸内挤流和涡流模型、油滴碰壁和反弹模型，计算结果表明，改进后的油束运动模型比原模型更加合理，较好地解决了空气卷吸问题，在不同转速和负菏工况下均能获得令人满意的精度，能够反映缸内与各区内的燃烧与排放物生成情况，用改进的多区模型可以较好地研究直喷式柴油机的工作过程及其排放。

Simulation of Direct Injection Diesel Engine Combustion and Emission

Based on the multizone combustion model of Hiroyasu for direct injection diesel engine,the updated model gives some improvements about the fuel droplet motion and evaporation,air entrainment,soot formation and oxidation.The effects of fuel spray impingement,air swirl and squish are also considered in the model.The simulation shows that the model gives more reasonable results on the spray movement and air entrainment.It can be used to predict the combustion and pollutant formation under different conditions,to study the engine performance and emissions.