收集处理方法对含铝固体推进剂凝相燃烧产物特性影响

The characteristics of condensed combustion products of aluminized solid propellant have profound influence on the combustion efficiency, combustion stability and adiabatic safety of solid rocket motor. In order to obtain accurate and reliable physical and chemical properties of condensed combustion products, a constant-pressure quench vessel was used to collect the condensed combustion products. Laser diffraction particle size analyzer, SEM and XRD were adopted to characterize the products. The effects of collection media, drying treatment and ultrasonic dispersion on condensed combustion products were investigated. The results show that the mean size is 60% larger in the experiment with water than that with nitrogen. Using water as collection media is more suitable for the study of condensed combustion products near propellant burning surface. The drying treatment can ensure the effective sampling of the large size particles, therefore the sample should be dried before size test in order to obtain the accurate particle size distribution data. The ultrasonic dispersion would reduce the content of large agglomerates, whereas increase the content of small agglomerates in the products, leading to a significant decrease in the average particle size of condensed combustion products. Under a frequency of 80kHz, the most reasonable parameter of ultrasonic dispersion is supposed to be 40W, 5min during size measurement. Based on the previous results, a more scientific and reasonable sequence of collecting and processing method of condensed combustion products is proposed.