含铝熔铸炸药冲击起爆数值模拟

Numerical Simulation on Shock Initiation of Aluminized Melt-cast Explosives

为建立适用于含铝熔铸炸药的冲击起爆细观反应速率模型,假设铝粉在冲击起爆过程中不发生化学反应,引入“含铝熔铸炸药基体炸药与铝粉混合法则”,基于孔隙塌缩热点形成机制,提出含铝炸药弹黏塑性球壳塌缩热点模型及其热点点火项反应速率方程;建立含铝熔铸Duan-Zhang-Kim细观反应速率模型。对2,4-二硝基苯甲醚基含铝炸药RBOL-2的冲击起爆过程进行数值模拟,对比发现不同加载压力下炸药到爆轰距离以及不同拉格朗日位置炸药到爆轰时间的计算结果与实验结果均吻合较好,表明该反应速率模型能够描述含铝熔铸炸药RBOL-2的冲击起爆特性。

A three-term reaction rate equation is used to develop a mesoscopic reaction rate model based on the pore collapse hot-spots for the shocked aluminized melt-cast explosives.The aluminum is considered to be inert during the shock initiation,and a mixing rule is introduced to determine the ignition parameters of a mixture composed of the matrix explosive component and aluminum.A shocked DNAN-based aluminized melt-cast explosive was numerically simulated.The numerical results of the distances to detonation and the times to detonation at different Lagrange locations are in good agreement with the experimental data,which indicates that the mesoscopic reaction rate model is available for describing the shock initiation characteristics of aluminized melt-cast explosive.