准均质充气压缩点燃（QHCCI）燃烧系统的模拟研究

建立了一个准维数学模型。将扩散燃烧和火焰传播燃烧同时分别加以计算，并有机结合，对准均质充气压缩点燃（QHCCI）燃烧系统进行了数学模拟。利用模型和试验结果；对QHCCI燃烧系统的工作机理进行了研究。研究结果表明，少量汽油被引燃柴油卷吸进入喷雾区，增加了扩散燃烧的燃油质量；当预混合气开始燃烧后，扩散燃烧并没有结束，一般地，QHCCI燃烧系统的燃烧放热率曲线具有特殊的“双峰”现象。

Numerical Modeling on Quasi-Homogeneous Charge Compression Ignition (QHCCI) Combustion System

Quasi Homogeneous Charge Compression Ignition (QHCCI) combustion system is an effective way to burn lean pre mixture on diesel engine.By calculating the diffusive combustion and flame propagation combustion simultaneously and respectively,the author established a quasi dimension numerical model which modeling QHCCI combustion process.With the model and experimental results,the author analyzes the mechanism of QHCCI combustion system.The results show that the small amount of premixed gasoline increased the intensity of the diffusive combustion.After the ignition of homogeneous charge,the diffusive combustion does not finish.Generally,the heat release rate holds two peaks.