关键词: 固体火箭发动机;单室双推力;装药设计;弧形内孔;内弹道

Abstract: In order to make up for the deficiency of the grain of the existing single-chamber dual-thrust solid rocket motor, the new kind of combined grain composed of single center hole and multiple cambered-holes was put forward. The grain has 7 controllable variables. The curves of burning perimeter and port area versus burning web were induced through actual calculation. Parameters of interior ballistic performance of different grain types were calculated by using structure parameters of a rocket motor. Parameters of interior ballistic performance of cambered-hole grain and double composition grain were compared under the same technical requirements. The results of the calculation and design show that cambered-hole grain structure can fulfill the need of the single chamber dual-thrust rocket motor easily. In the calculation example taken in this paper, the acceleration time of the missile with porous cambered-hole grain is 75% shorter than that of the missile with star hole-single hole tube charge, the maximum speed of the missile has increased by 17%, and the speed and thrust of the missile are more stable. The new kind of grain provides a new technical way to engineering design of single chamber dual-thrust rocket motor.

Key words: Solid rocket motor;Single chamber dual-trust;Grain design;Cambered-hole;Interior ballistics