火箭发动机单室双推力多孔装药设计方法

Design Method of Multiperforated Grain for Single-chamber Dual-thrust Rocket Motor

为有效提高火箭弹炮口速度,减小发动机后喷燃气对发射装置的作用力,提出了单室双推力多孔装药结构,给出了装药药柱燃烧面积及通气面积计算方法,利用某火箭发动机的装药参数,计算了多孔装药内弹道特性参数.设计及计算结果表明,多孔装药结构易实现单室双推力的要求,能够提高装药药柱的刚强度特性.

In order to improve muzzle velocity of rocket projectile and reduce force of back exhaust gas acting on launcher device, multiperforated grain structure of single-chamber dualthrust rocket motor was put forward. Calculation methods of burning surface and port area of grain were presented. Parameters of interior ballistic performance of multiperforated grain were calculated by using grain parameters of a rocket motor. The results of the calculation and design show that multiperforated grain structure can fulfill the need of the single-chamber dual-thrust rocket motor easily, and can improve intensity and stiffness of the grain.