关键词: 固体推进剂火箭发动机;绝热层;烧蚀;实验研究

Abstract: Focusing on the abnormal ablation of certain model solid rocket motor under flight overload condition, insulator material screen experiments were carried out based on the experimental simulation facility of high acceleration condition. Through the screen experiments the maximal carburization ablation rate and mass ablation rate were obtained, and the sort order of three kind of insulator ablation characteristic was achieved. In order to analyze the ablation mechanism of insulator, the surface and cross section configuration of the carburization layer were obtained by using the scanning electron microscope. The results show that:(1) under the same particles impacting conditions, the carburization ablation rate and mass ablation rate of insulator material B is maximal and A1 is minimal than others, and the material A take second place. The anti-particle erosion ability of material A1 is best than others. (2) the appropriate quantity of fiber and SiO2 could intensify the erosion resistance of ablatives because of the formation of the framework structures on carburization layer through the carbonization in situ of aramid fiber; (3) the new type insulator material system reinforced by aramid fiber and asbestos fiber synchronously was proposed.

Key words: Solid propellant rocket motor (SRM); Insulator; Ablation; Experimental investigation