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基于柴油机高海拔燃烧与排放特性模拟试验台,开展了煤基复合燃料(33％煤基含氧燃料,67％-35#柴油)柴油机不同海拔燃烧与排放特性研究.结果表明,随着海拔升高,煤基复合燃料柴油机最高燃烧压力降低,放热率峰值下降,滞燃期延长,PM2.5排放增加,海拔2500 m标定工况PM2.5排放比平原增加28.9％.与燃用柴油相比,相同海拔下,煤基复合燃料柴油机滞燃期延长,燃烧持续期缩短,PM2.5排放减少,且海拔越高PM2.5排放降低幅度越大.煤基复合燃料柴油机高海拔燃烧过程数值模拟结果表明,海拔5500 m煤基复合燃料SOOt排放明显降低.“,”Based on the simulation test bed for high altitude combustion and emission characteristics of diesel engine, the combustion and emission characteristics of coal-based hybrid fuel (33％ coal-based oxygenated fuel and 67％-35# diesel) diesel engine at high altitude were studied. The conclusion showed that with the increase of the altitudes, the maximum combustion pressure of coal-based hybrid fuel diesel engine decreases, the peak of heat release rate decreases, the ignition delay increases, PM2.5 emission increases. At altitude 2500 m, PM2.5 emission increased by 28.9％ compared with plain in rated condition. Compared with the diesel fuel, at same altitude the ignition delay of coal-based hybrid fuel diesel engine is prolonged, the combustion duration decreases, PM2.5 emission decreases, and the higher the altitude, the lower the PM2.5. the numerical simulation of combustion process of coal-based hybrid fuel diesel engine at high altitude were carried out, the result of showed that compared with the diesel fuel, at the altitude of 5500 m, the soot emissions decreased significantly.