发动机运转参数对均质充量压缩燃烧着火时刻的影响

为研究发动机运转参数对均质充量压缩燃烧（HCCI）着火时刻的影响机理，笔者采用了一个两区准维模型（分为绝热中间层区和热边界层区）对四冲程HCCI发动机压缩阶段的温度时间函数进行模拟，在此基础上进行了仿真计算，并研究了初始混合气温度、废气再循环（EGR）率、混合气浓度等运转参数对HCCI燃烧着火时刻的影响．结果显示，随着混合气初始温度的提高和废气再循环（EGR）率的增加，HCCI燃烧的着火时刻提前；而当混合气由稀变浓时，着火时刻推迟。

Investigation of engine operating parameters influencing on HCCI combustion ignition timing

In order to investigate the effect of engine operating parameters influencing on HCCI(Homogenous Charge Compression Ignition) combustion ignition timing,a two-zone,quasi-dimensional model had been developed to simulate the temperature time functions during the compression process.The two-zone model consisted of an adiabatic core zone and a thermal boundary zone.Based on this model,the system is simulated.The ignition timing with the varying of the initial mixture temperature,the percentage of exhaust gas recirculation(EGR),and the mixture concentration are studied.The results show that the higher initial mixture temperature and the percentage of EGR,the earlier ignition timing.When the concentration of air-fuel mixture is changed from thin to dense,the ignition timing will be postponed.