聚集状态下凝相颗粒的收集与测量

Collection and measurement condensed particle under aggregation condition

关键词:  固体推进剂火箭发动机  燃烧室  复合推进剂  颗粒  粒度分布  颗粒大小

Key words:  Solid propellant rocket motor  Combustion chamber  Composite propellant  Particle  Granularity distribution  Particle size

摘要:

发展了一种可以收集燃烧室中聚集状态颗粒的方法,研制了收集实验装置。数值计算表明,通过改变实验装置的收敛角和实验状态参数可以模拟真实发动机中的颗粒聚集状态。利用该实验装置开展了聚集颗粒收集实验,实验工况模拟了某高过载发动机在横纵向过载均为40g时的颗粒聚集状态。对实验收集到的颗粒进行了电镜分析,发现大颗粒是由多个小颗粒聚合而成,说明聚集状态下颗粒间碰撞聚合的概率大大增加。对粒径分布进行了半定量的统计,与非聚集状态下的发动机燃烧室中的粒径分布作了比较,证明聚集状态下粒径要比非聚集状态下的大得多。

Abstract:

A method to collect high-density particle stream in chamber of SRM was developed.A particle collection facility was designed based on the rule of particle colliding and congregating in high acceleration SRM.Three-dimensional two-phase numerical simulations were carried out to show the feasibility of this method and that the facility could simulate the state of condensed particle in aggregation condition.The particle collecting experiments were carried out by test facility and the case was similar to that in the chamber of rocket motor with 40 g longitudinal and lateral accelerations.The collected particles were analyzed by Scanning Electron Microscope.The coagulate pattern of particle showed that the diameter of particle increasing with concentration of particle cluster.Semiquantitative Statistics was applied to measure the particle size.Co MPared with the particle size distributions measured by laser holographic in normal motor,it can be concluded that particle size under aggregation condition was greater than normal.