Particle collection and influence of aggregation condition on particles size distribution of solid rocket motor
- Paper number
IAC-06-C4.P.2.02
- Author
Mr. Liu Yang, Northwestern Polytechnical University, China
- Coauthor
Prof. Guoqiang He, Northwestern Polytechnical University, China
- Coauthor
Prof. Jiang Li, Northwestern Polytechnical University, China
- Year
2006
- Abstract
To understand the influence of the aggregation condition on the particles size distribution of solid rocket motor (SRM) is very important for two phase and erosion investigation of SRM. 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. The aggregated particles generated by a convergent duct were collected and cooled by a kind of particles collection device. Three-dimension 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 condition was similar to that in the chamber of rocket motor with 40g 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. Semi-quantitative Statistics was applied to measure the particle size. Compared 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. The particles collecting experiments and size analysis were carried out to study the influence of the chamber pressure on particles size distribution. The particles size was measured by a laser particles analysis instrument. The experimental results show that the mean particles size under aggregated condition is very larger than that under normal condition and the size distribution range is wider than normal condition too. There are double or multi peaks in size distribution curves. The size of particles is augmented with the increasing of chamber pressure because the concentration and the staying time in chamber of particles is increased while the chamber pressure is increased and the probability of collision and coalescence between particles is increased also.
- Abstract document