凝聚相粒子在喷管喉部沉积规律的理论预示

以金属粉末为添加剂的固体燃料,在燃烧后金属氧化物以凝聚态的形式在喷管中流动。对于工作时间长、喷喉较小的固体火箭发动机,凝相粒子在喷管喉部的沉积严重地影响到发动机的内弹道性能,甚至引起发动机的爆破事故。因此,搞清沉积规律是十分必要的。 本文根据凝相粒子的运动规律以及关于沉积层的移动边界传热问题的分析,提供了一个关于沉积速度的理论预估方法。通过算例,证明理论预估与实验资料是十分吻合的。

THEORETICAL PREDICTION OF CONDENSED PHASE PARTICLES DEPOSIT LAW ON THE THROAT SURFACE

In the motor using solid propellant with metal additions, after burning, the condensed metal oxide particles flow through the nozzle and some deposit on the nozzle surface. This has a serious effect on the internal trajectory performance of the motor with small nozzle throat and long-time operation.Therefore, it is necessary to investigate the law of deposition.This paper based on the law governing the motion of the paticles and analysis of the heat transfer involved in moving boundary condition, has developed a theoretical prediction method of the deposit velocity.A computational example is given, and the theoretical results agree with the experiment data.