37孔硝基胍发射药单一装药和混合装药的燃烧性能

为了解37孔硝基胍发射药单一装药和混合装药的定容燃烧性能,采用花边形37孔三胍-15发射药为主装药(MC),花边形19孔三胍-15包覆药为辅助装药(B)。通过定容密闭爆发器实验,装填密度为0.20 g·cm-3,在高温(50℃)、常温(20℃)、低温(-40℃)条件下,研究弧厚对单一主装药燃烧性能的影响以及混合比例对混合装药(MC+B)燃烧性能的影响。结果表明,随温度降低,37孔单一主装药侵蚀燃烧现象越明显,燃烧渐增性越弱,而相同温度下,弧厚越大的主装药,其侵蚀燃烧现象越不明显,燃烧渐增性越强;温度越高,同一混合比例的混合装药ΔL、Lm/L0值越大,燃烧渐增性越好;相同温度下,混合装药的燃烧渐增性均强于单一主装药,且随着包覆药比例增加,侵蚀燃烧峰逐渐减小,说明包覆药的加入明显地提高了混合装药的渐增性并降低了侵蚀燃烧峰,且在50,20,-40℃条件下,混合装药获得较佳燃烧渐增性的混合比例均为7∶3。

Combustion Performance of Single Charge and Mixed Charge of 37-hole Nitroguanidine Propellant

In order to understand the constant volume combustion performance of single charge and the mixed charge(MC+B)of 37-hole nitroguanidine propellant,a lace-shaped 37-hole triguanidine-15 propellant was used as the main charge(MC),and the lace-shaped 19-hole triguanidine-15 coated propellant was used as the auxiliary charge(B).The packing density is 0.20 g·cm-3,under 50℃,20℃,-40℃,the effect of arc thickness on the combustion performance of single main charge and the ef-fect of the mixing mass ratios on the combustion performance of the mixed charge(MC+B)were studied through constant vol-ume closed-bomb test.The results show that the lower the temperature,the more obvious the erosion and combustion phenome-non of the 37-hole single main charge.At the same temperature,the greater the arc thickness of the main charge,the less obvi-ous the erosion and combustion phenomenon,the stronger the progressive combustion,and the better the combustion perfor-mance.The higher the temperature,the greater the value ofΔL,Lm/L0 of the mixed charge of the same mixing ratio,the better the progressive combustion.At the same temperature,the progressive combustion of the mixed charge is stronger than that of the single main charge,and as the ratio of the coated propellant increases,the erosion combustion peak gradually decreases,indi-cating that the addition of the coated propellant significantly improves the progressive combustion and reduces the erosion com-bustion peak of the mixed charge,and at 50℃,20℃,-40℃,the mixing ratio of the mixed charge to obtain better progressive combustion is 7∶3.