聚集状态下燃烧室凝相粒子粒度特性实验

Experiment on granularity peculiarity of condensed particlesin the chamber of SRM under aggregation condition

关键词:  固体火箭发动机  粒子收集  粒度分布  聚集状态 

Key words:  Solid rocket motor  Particle collection  Diameter distribution  Aggregation condition

摘要:

设计了具有收敛段的粒子发生装置,采用密闭收集水罐,针对HTPB推进剂开展实验,有效完整地收集到了聚集状态下的凝相粒子。采用扫描电镜和粒度分析仪对收集的粒子进行了分析。结果表明,聚集状态下颗粒间碰撞聚合非常严重,大颗粒一般由多个颗粒聚合而成。碰撞聚合条件下凝相粒子的粒度分布范围比较宽,颗粒分布峰值粒度在9～13μm之间,比非聚集状态下的主峰粒度大很多。研究结果可为两相流数值计算、发动机工作过程分析提供基础数据。

Abstract:

The particle-generator device with a convergent part was designed and experiments were carried out using typical HTPB composite propellant containing 17% aluminum. The condensed particles in the chamber of SRM under aggregation condition were effectively and completely collected in the use of an airtight water tank and analyzed by means of Mastersizer2000 and SEM. The results show that compared with the normal condition, the collision among particles is more severe under aggregation condition . The condensed particles distribute in a much wider range and the volumetric distribution peak value of particle size is much bigger, which lies between 9μm and 13μm. The results provide basic data for simulation of two-phase flow and analysis of operating courses in the rocket motors.