从含氧清洁燃料二甲醚 (DME)低温着火的化学反应机理入手 ,开展了DME自燃着火过程的数值模拟研究 ,进而建立了不同温度、压力和燃空当量比条件下DME着火滞燃期的数据库 ,通过将该数据库与发动机工作过程的模拟模型相耦合 ,对DME发动机的运转性能进行了变参数预测分析 ,预测结果与实验结果符合较好 Starting from the chemical reaction mechanism of low temperature ignition of dimethyl ether (DME), which is an oxygen-containing cleaning fuel, the numerical simulation of DME self-ignition ignition process was carried out. Then the DME ignition delay period under different conditions of temperature, pressure and air- By coupling the database with the simulation model of the working process of the engine, a variable parameter predictive analysis of the DME engine performance is carried out. The prediction results are in good agreement with the experimental results