含咪唑类铅盐催化剂的RDX-CMDB推进剂燃烧性能

研究了咪唑类含能铅盐(E-Pb)催化剂含量及与炭黑复配时对RDX-CMDB推进剂的燃速、压强指数及燃烧火焰结构等燃烧性能的影响。分析了含能催化剂和惰性催化剂影响RDX-CMDB推进剂燃烧行为的原因。结果表明,含有含能催化剂的RDXCMDB推进剂的燃烧性能优于含惰性催化剂的RDX-CMDB推进剂的燃烧性能。10 MPa下的燃速由不含催化剂的推进剂的11.74 mm·s-1提高至含E-Pb的推进剂的25.36 mm·s-1,且随E-Pb含量的增加该推进剂的燃速增加。当含能铅盐与炭黑复配时催化效果更佳,炭黑与含能铅盐质量比为1.5∶0.25时,在4~17 MPa较宽区间出现平台燃烧,压强指数n0.25。表明,含能铅盐对推进剂的燃烧火焰结构、暗区厚度、燃面上的亮点数目等的影响有一定规律性。

Combustion Performances of RDX-CMDB Propellant with Imidazoles Lead Salt Catalyst

The effects of energetic imidazoles lead salt (E-Pb) content and E-Pb-carbon black composite on the combustion performances (burning rate, pressure exponent, combustion flame structure, etc.) for RDX-CMDB propellant were studied. The reasons affecting the combustion behaviors of RDX-CMDB propellant by the energetic catalyst and inert catalyst were analyzed. Results show that the combustion performances of the RDX-CMDB propellant with energetic catalyst are better than those of the RDX CMDB propellant with inert catalyst. The burning rate at 10 MPa increases from 11.74 mm·s^-1 for the propellant without catalyst to 25.36 mm·s^-1 for the propellant with E-Pb catalyst and the burning rate of the propellant increases with increasing the content of energetic catalyst. When the energetic lead salt and carbon black are matched, the catalytic effect of the propellant is better. When the mass ratio of carbon black and energetic lead salt is 1.5:0.25, a burning platform appears over the wide pressure ranging from 4 to 17 MPa and the pressure exponent n is less than 0.25.The effects of energetic lead salt on the combustion flame structure, thickness of dark space, number of bright spots on the combustion surface, etc. for propellant have certain regularities.