空中爆炸冲击波的数值模拟研究

Research on Numerical Simulation of Blast Wave in Air

采用有限元程序LS-DYNA对集团装药在空中爆炸产生的冲击波进行模拟,将模拟值和Henrych J经验公式计算值进行对比,证明:采用合理的有限元模型可以有效地模拟空中爆炸冲击波的传播过程。在此基础上,进一步就不同单元网格密度和空气状态方程参数对模拟精度的影响分别进行分析。结果表明:网格密度越大,模拟精度越高,网格密度需≥2;空气状态方程参数越大,冲击波峰值超压越大。

Blast wave in air generated by exploding a cube charge was simulated using commercial FEM program LS-DY- NA. Comparing the results of numerical simulation with those of experiential Henrych J formula, the program is able to simulate blast wave well if reasonable FEM model is adopted. It was found that the element density had significant effects on the simulation and the min of the element density is 2. Finally, the peak overpressure of blast wave is increasing by adjusting the parameter in equation of state of air to reduce the number element.