关键词: 战术发动机；中、小过载；两相流；三维数值仿真

Abstract: According to the flight conditions of the tactical SRM(Solid Rocket Motor)，a three-dimensional numerical model of two-phase flow was established for overload conditions. Flow field calculations were carriedout for three different types of working conditions under small and medium-sized overload，respectively. The pa. rameter distribution of the condensed particles in combustion chamber was analyzed，and a preliminary analysisof the effects of aggregation state of particles on the insulation ablation was performed. The results show that:(1) When the lateral acceleration is larger than a certain degree，an accumulation belt will be formed on the cylin.der section of the motor insulator surface as particle concentration increasing slowly on the bearing surface alongflow direction. However，particledistribution issparseon the non-bearingsurface.(2)The contribution of mo. tor overload on the particle velocities is not significant. The main reason is that the axial acceleration of particlesis mainly derived from the gas itself.(3)To some extent，particle aggregation zone shows the position of relative.ly severe ablation environment in the combustion chamber of motor. The insulation ablations mainly due to thelow velocities of particles aggregation lead to the increasing of heat increment on the local insulator surface， and cause particles focalized secondly. Thus，under low and medium acceleration with long operation time，in or. der to alleviate the harsh ablation environment of local insulator in chamber combustion，according to the known particle distribution parameters，the design of motor should increase the thickness of local insulator，and adjustthe flying attitude to make the bearing surface rendering acceleration alternating and increase the rotation actionof motor.

Key words: Tactical solid rocket motor；Low and medium acceleration；Two-phase flow；Three-dimensional numerical simulation