高聚物粘结炸药冲击起爆统计热点反应速率模型

为深入探索非均质固体炸药冲击起爆热点机制，重点关注炸药孔洞尺寸分布及热点点火临界条件，建立高聚物粘结炸药(PBX)冲击起爆统计热点反应速率模型，描述热点形成、形核或消亡、点火后燃烧反应演化直至快速转为爆轰的全过程。奥克托今（HMX）基PBX9501和三氨基三硝基甲苯（TATB）基LX-17炸药冲击起爆过程的数值模拟结果显示，反应流场中波到达时间的计算值与实验值偏差小于3.7%，初步验证了统计热点反应速率模型的合理性，且相比文献［21-24］的统计模型适应性更强。研究结果表明：孔洞尺寸分布对非均质固体炸药冲击起爆感度影响显著；HMX基PBX炸药冲击起爆爆轰成长过程呈加速反应特性，而TATB基PBX炸药表现为稳定反应特性，进一步提高了对HMX/TATB混合基钝感高能炸药冲击起爆机理的认识。

A Statistical Hot Spot Reaction Rate Model for Shock Initiation of PBX

A statistical hot spot reaction rate (SHS) model for shock initiation and detonation of heterogeneous solid explosives is developed to describe the formation，growth or disappearance of hot spots，combustion after nucleation and rapid transition to detonation. The pressure-time histories in both HMX-based PBX9051 and TATB-based LX-17 are calculated by using the SHS model， and the numerical results are found to be in good agreement with the experimental data. It is found that the void size should be controlled as small as possible to improve the safety during the synthesis of insensitive high explosives. The results indicate that the shock initiation behavior of the HMX-based PBX has the accelerated reaction characteristics，and the TATB-based PBX has a stable reaction characteristic.