烤燃条件下HMX/TATB基混合炸药多步热分解反应计算

Calculation on multi-step thermal decomposition of HMX-and TATB-based composite explosive under cook-off conditions

采用多步热分解反应动力学模型,描述单质炸药热分解反应,提出了多组分网格单元计算方法,对以HMX/TATB为基的多元混合炸药在烤燃条件下的热反应过程进行了计算。通过炸药烤燃实验测量了炸药内部温度,获得了炸药点火时间,验证了计算的准确性。分析了混合炸药组成比例的变化对炸药热反应性能的影响。在HMX/TATB混合炸药热反应阶段,主要是HMX发生分解反应释放热量,TATB的反应量很少,随着混合炸药中TATB含量的增多,炸药的点火时间逐渐增长,点火温度逐渐增高,炸药热安全性增强。

The thermal decomposition of each component in the composite explosive was described by the multi-step chemical kinetics model. A multi-component grid unit calculation method was put for- ward to calculate the thermal decomposition reaction processes of the HMX and TATB based compos- ite explosives under the cook-off conditions. And the cook-off tests were carried out to measure the temperatures and ignition times of the explosives and verify the accuracies of the calculations. The thermal reaction performances of the composite explosives were analyzed by changing the mass frac- tion of each component in them. The results show that the exothermic decomposition of the HMX predominates in the thermal decomposition process of the HMX/TATB composite explosive. Moreo- ver, the ignition time and temperature of the composite explosives increase with the increasing of the TATB contents in the composite explosives.