【摘要】 为了预测不同尺寸乃至大尺寸NEPE推进剂的热安全性,在不同尺寸NEPE推进剂热安全性试验的基础上,基于尺寸与热分解反应表观动力学参数之间的数学关系,采用理论计算和数值模拟方法研究了不同尺寸NEPE推进剂的热安全性。结果表明,某尺寸试验发动机装药热爆炸临界环境温度和延滞期的数值模拟结果为78～79℃、100～150d(79℃);原始的Semenov、Frank-Kamenetskii、Thomas理论算法和有限元算法得出的热爆炸临界环境温度偏高,工程化修改的Semenov理论算法获得的计算结果与试验结果更为接近;长径比为1的药柱在其直径由10mm递增至3000mm过程中尺寸增大,热爆炸临界环境温度由130℃逐渐向60℃靠近,且尺寸越小,增大尺寸导致热爆炸临界环境温度降低的效果越明显。更多还原

【Abstract】 In order to predict the thermal safety of NEPE propellant grain with different sizes,the mathematical relationship between the size and apparent kinetic parameters of exothermic decomposition reaction, based on previous thermal safety tests of NEPE propellant grain with different sizes, was applied for theoretical calculation and numerical simulation, and the thermal safety performance of NEPE propellant grain with different sizes was investigated. The numerical simulation results of the thermal explosion critical temperature and delay period are 78—79℃ and 100—150 d(79℃); the thermal explosion critical temperature obtained from original Semenov, Frank-Kamenetskii, Thomas theory algorithm and original finite element methods are higher than that of the test data, and the data obtained by engineering modified Semenov theory algorithm are closer to the experimental results. In the process of increasing diameter from 10 mm to 3000 mm, the thermal explosion critical environment temperature gradually approaches from 130℃ to 60℃, and the smaller the size is, the more obvious the effect of decreasing the critical environment temperature of thermal explosion is.更多还原