空中爆炸冲击波作用的数值仿真实验研究

Application of numerical simulation experiment method of explosive shock wave in the air

研究了爆炸冲击波作用的数值仿真实验方法,分析了用经验公式计算冲击波超压峰值的差异及其原因。基于LS-DYNA软件、ALE算法和流固耦合理论建立了爆炸冲击波的数值实验方法,并将数值实验结果与爆破现场试验数据、经验公式计算结果进行对比,验证了数值仿真实验技术的有效性。分析了LNG储罐的爆炸冲击响应和冲击波超孔压响应,得到冲击波遇到储罐结构后的绕射过程。实验表明:爆炸荷载数值实验方法可用于大型LNG储罐工程的抗爆问题研究。

A numerical experiment method is studied for explosive hock wave propagation in the air,and the peak overpressure calculated by various empirical formulas is compared and the difference reasons are analyzed.By using three modeling methods including LS-DYNA software,ALE algorithm and fluid-solid coupling theory,a numerical simulation technology is proposed for blast shock wave.The peak overpressure results obtained by numerical experiment are compared with blasting test measured data and the empirical formula results,which verifies the effectiveness of numerical simulation experiment.Finally,the explosion shock response of LNG storage tank was analyzed,and the diffraction process is obtained after the shock wave encountered the tank structure.The overpressure response is obtained at characteristics positions,which also shows that the proposed numerical experiment method can be used in antiknock performance studies for LNG storage tank.