高密实颗粒药床燃烧转爆轰的数值模拟

NUMERICAL SIMULATION OF DEFLAGRATIONTO-DETONATION TRANSITION IN HIGHLY PACKED GRANULAR PROPELLANT BEDS

关键词:  固体推进剂  推进剂燃烧  爆轰试验  数值模拟

Key words:  Solid propellant  Propellant combustion  Detonation test  Numericalsimulation

摘要:

在实验基础上建立起描述多孔固体推进剂中燃烧转爆轰过程的一维反应两相流模型。用ＭａｏＣｏｒｃｍａｋ有限差分格式和自适应网格技术数值求解了控制方程。数值结果表明，在燃烧转爆轰的各个阶段，颗粒床都存在不同程度的动态压缩，压缩波和燃烧波的相互作用是燃烧向爆轰转变的内在原因。数值预测与实验结果进行了比较，两者有相当的一致性。

Abstract:

one-dimensional two-phase reactive flow model is established based on experiment to describe deflagration-to-detonation transition (DDT) in porous solid propellants. The governing equations have been numerically solved using MacCormack finite difference scheme and self-adaptive-grid technique. The numerical results show that dynamic compaction of the porous bed occures during each stage of the DDT processed and the transition from de fi agrat ion-to-detonation is mixture results of compressive wave and combustion wave. The numerical predictions agree well with the experimental results.