中文摘要：

根据碳氢燃料化学反应系统具有层次结构的特性，本文通过分析二甲醚（DME）与液化石油气（LPG）的详细化学反应机理，构建了反映DME／LPG混合燃料均质压燃（HCCI）燃烧的详细化学反应机理。采用该机理应用单区燃烧模型对DME／LPG混合燃料HCCI燃烧的化学反应动力学过程进行了数值计算。计算结果与试验结果对比表明，所构建的DME／LPG混合燃料氧化的详细化学反应机理能够准确预测DME／LPG混合燃料的两阶段放热特性，对低温和高温着火始点的预测很好；但高温反应过程预测欠佳，高温反应机理需要改进。

英文摘要：

According to the hierarchical nature of reacting systems with hydrocarbon fuels, a detailed chemical kinetic mechanism was put forward to reflect the HCCI combustion with DME/LPG blended fuel by analyzing the detailed chemical kinetic mechanisms of dimethyl ether （DME） and LPG. Single zone model combined with the proposed detailed mechanism was used to simulate the chemical kinetic process of HCCI combustion with DME/LPG blended fuel. Comparison between simulation and experiment indicates that the proposed detailed mechanism of DME/LPG oxidation can precisely predict the two-stage heat release characteristics of DME/LPG HCCI combustion and the predicted ignition timings of low temperature reaction and high temperature reaction are agreed well with the experimental ones. However, the prediction for high temperature reaction process is not good and the high temperature reaction mechanism should be improved.