密闭空腔内强爆炸冲击波壁面反射规律研究

Reflection of Strong Shock Wave on Closed Chamber Surface

为合理模拟强爆炸过程中的冲击波传播过程,将变γ状态方程加入LS-DYNA3D971接口用户子程序中。利用该程序对一维球对称密闭空腔内强爆炸冲击波反射过程进行了数值模拟,并通过参数敏感性分析确定了合理的强爆炸源初始参数,计算得到的固壁处冲击波到时、反射超压和反射冲量等数值模拟结果与实验结果基本一致,验证了数值模拟程序和强爆炸源参数选取的合理性。

A variable γ equation of state is introduced into user subroutine in LS-DYNA3 D971 for simulating the propagation process of shock wave during explosion. The user subroutine is used to simulate the propagation and reflection of strong shock wave in 1 D sphere closed chamber. The initial parameters of strong explosion source are determined by analyzing the parameter sensitivity,and the arrival time,reflected overpressure and reflected impulse of shock wave on the chamber rigid surface are calculated. The calculated results agree well with the experimental data. The results show that numerical simulations and parameter selection are reasonable and valid.