HTPB/AP/Al复合推进剂燃速降速剂研究

Study on Burning Rate Inhibitors of HTPB/AP/Al Propellants

通过测定5．1MPa压强下HTPB／AP／Al复合推进剂药条静态燃速和BSF075mm、BSF0165mm标准发动机实验，研究了（NH4）2C2O4，LiF，CaCO3，SrCO3及季铵盐等燃速调节剂对推进剂燃烧性能、能量性能等的影响。结果表明，季铵盐降速效率最高，季铵盐与碳酸盐组合使用可使固体质量分数为87％的推进剂在5．1MPa压强下的静态燃速降至3mm／s左右。BSFΦ75mm发动机测试表明，含季铵盐与碳酸盐组合降速剂的推进剂配方在3．45～12．17MPa压强范围内的压强指数为0．2，达到了平台推进剂水平，密度比冲较相近燃速的含草酸铵推进剂高2．8％，且内弹道曲线更稳定。

The effect of ammonium oxalate, lithium fluoride, calcium carbonate, strontium carbonate, quaternary ammnium salt and etc. as burning rate inhibitors on burning rate of HTPB/AP/Al propellant have been investigated. Considerable decrease in burning rate has been observed when quaternary ammonium salt composite withcarbonate or lithium fluoride are used as depressant ,and above-mentioned composite inhibitors have excellent effect on decreasing the burning rate of propellants. In HTPB/AP/Al propellants,the quaternary ammonium salts composite with carbonates are more pronounced on decreasing burn rate than ammonium oxalate inhibitor which is now used for many practical low burning rate propellant. The firing tests of BSFΦ75mm motors indicate that quaternary ammonium salt composite with carbonate also could decrease the pressure exponent of the propellant from 0.33 to 0.20in the pressure range of 3.45-12.17MPa. The firing test of BSFΦ165mm motors loaded with HTPB/AP/Al propellant grain containing quaternary ammonium salt and carbonate as inhibitor gives more stable chamber pressure--time and thrust--time histories than that containing ammonium oxalate,and the results show that the density-specific impulse of obtained formulation is 2.8% higher than that containing ammonium oxalate with the same burning rate.