为了研究固体火箭发动机燃烧室内凝相颗粒的分布规律,改进了一种固体推进剂凝相燃烧产物收集装置,针对典型的HTPB复合推进剂,开展了不同聚集状态下凝相颗粒的收集实验。研究结果表明,凝相燃烧产物在0.27~100µm之间都有颗粒存在,凝相颗粒主要集中在0.27~10µm之间,粒径大于20µm的颗粒较少;工作压强对颗粒粒径分布有较大影响,随着工作压强的升高,凝相颗粒粒径变小,粒度分布更为集中;工作压强相同的条件下,随着聚集角度的增加,凝相颗粒粒径变大。

A device was improved to collect the condensed particles of the solid propellant. The typical HTPB composite propellant containing 17% aluminum was experimentally investigated under different condition. Collection experiments and particle size analysis were performed so as to investigate the effects of operation pressure and concentration degree on particle size distribution. The experimental results show that the range of particle size is from 0.27µm up to about 100µm. The majority of particle size is from 0.27µm to 10µm. The result indicates that the particle size distribution is primarily dictated by the operation pressure. The particle size is reduced with increasing pressure, at the same time the diameter distribution is concentrated. It is found that the particle diameter is raised with the increase of the concentration degree.