采用颗粒轨道模型对固体粉末冲压发动机的两相流场进行了三维数值模拟,研究了大速差射流稳燃装置对发动机掺混燃烧性能的影响.计算结果表明,大速差射流稳燃装置提高了粉末燃料与空气的掺混程度,同时增大了粉末燃料在发动机中的停留时间,大幅度提高了粉末冲压发动机的燃烧效率,发动机燃烧效率达到89.3%. The particle trajectory model was used to simulate the two-phase flow field of the solid powder ramjet engine and the effect of the steady jetting device with large velocity jet on the combustion performance of the engine was studied. The blending degree of powder fuel and air increases the residence time of the powder fuel in the engine and greatly improves the combustion efficiency of the powder stamping engine. The combustion efficiency of the engine reaches 89.3%.