弱点火条件下炸药燃烧转爆轰的数值模拟

考察颗粒炸药从传导燃烧到对流燃烧再到爆轰的过程.对装填密度为85%的HMX颗粒炸药的燃烧转爆轰过程进行数值模拟，分析传导燃烧、对流燃烧和爆轰的发展过程.点火早期燃烧速度很低，火焰面在8.16 ms之内只前进了不到0.2 mm；形成对流燃烧之后燃烧速度快速增加，只用了0.1 ms就形成了速度为8 165 m·s^-1的稳定爆轰.当炸药颗粒直径或点火压力减小时，形成稳定爆轰所需的时间增加.

Numerical Simulation of Deflagration to Detonation Transition in Explosives Under Weak Ignition

By introducing conductive burning process into classical deflagration-to-detonation transition (DDT) model, transition process from low speed conductive burning to convective burning to detonation was proposed. Transition process in HMX granular bed with 85% loading density was simulated. Development of conductive burning, convective burning and detonation was analyzed. In early stage combustion propagation rate is very slow. It propagates no more than 0. 2mm within 8. 16ms. After onset of convective burning, it tooks 20 ms to form a steady detonation with a velocity of 8 165 m·s^-1. Time to form detonation increases with decrease of particle diameter and ignition pressure.