缸内直接喷射LPG发动机混合气形成过程模拟

缸内直接喷射发动机具有良好的工作稳定性和负荷特性,可以在部分负荷下实现分层燃烧,大大提升了燃油经济性。其中,组织形成合适的缸内混合气分布是缸内直接喷射发动机稳定工作的关键。本文使用FIRE软件建立了液化石油气(LPG,Liquefied Petroleum Gas)的缸内直接喷射和混合气形成过程的数值模型,解析了液态LPG喷射以后缸内混合气的浓度场,以及LPG-空气在缸内的速度分布。

Numerical simulation of mixture formation for direct injection LPG engines

Direct injection engine can bring better working stability and load characteristic to engines.It can also realize stratified combustion and thus improve the fuel economy.The formation of an appropriate mixture distribution is a key to working stability of direct injection engines.Therefore,by using the CFD code FIRE,the mixture formation of the LPG(Liquefied Petroleum Gas) fuel in a direct injection way was modeled in this paper,and the concentration and velocity distribution of the mixture after the start of LPG injection were analyzed based on the simulation results.