乙醇HCCI燃烧过程影响因素的数值模拟

Simulation and Study on the Effect of Rotating Speed and EGR to Ethanol HCCI Combustion Process

根据乙醇氧化反应的化学反应动力学的机理,在零维模型基础上建立了HCCI燃烧模型。采用能够自动调节步长的Gear算法求解复杂化学反应动力学问题,在计算速度和计算精度上得到了很好的效果。对转速、EGR(排气再循环)率等因素对燃烧特性的影响进行了研究,为乙醇HCCI燃烧过程的分析提供依据。

According to the detaited chemical kinetic mechanism of ethanol, a HCCI combustion model was created based on of zero dimension model. In this study, Gear BDF method was used to solve the stiff difference equations. Gear BDF can control steps automatically to keep enough precision. Results showed good encouragements on both computing rate and precision. With this model, the effect of rotating speed and EGR on the combustion characteristics were investigated, which provided the basis for analyzing the HCCI combustion.