柔性防护结构对爆炸冲击波衰减作用数值模拟

Numerical Simulation on Flexible Protection Structure Attenuation to Blast Wave

为了应对小当量的爆炸物,减小爆炸冲击波对人员的伤害和财物的损害,研究了一种柔性防护结构。根据爆炸相似理论,对爆炸物TNT当量为3 kg的典型目标选择1∶50缩比模型,建立二维仿真简化模型。采用欧拉算法数值模拟圆柱形柔性防护结构对爆炸冲击波的衰减作用,对不同厚度柔性防护结构的防护效果进行对比研究。仿真结果表明,柔性防护结构能有效的减小冲击波超压峰值,增加正压作用时间;得到的柔性防护结构水介质防护层厚度优化值,能很好的满足防护效果与轻量便携的应用背景,对柔性防护结构设计具有参考作用。

In order to deal with small equivalent of explosive, a flexible protective structure is studied to reduce the damage of blast wave for personnel and property. Based on the explosion similarity laws, a 1 ： 50 scaled model is presented for typical target of explosive TNT equivalent to 3 kg, and the simplified 2D simulation model is set up. Then using the Euler algorithm simulates the cylindrical flexible protection structure attenuation to blast wave, a contrast study has been employed to analyze the protective effect of different thickness flexible protective structure. The simulation results indicate that flexible protection structure can effectively reduce the peak overpressure of blast wave and increase the positive pressure effect time ; the optimal value of water protective layer thickness of flexible protective structure has been chosen , which can be employed protection effect and lightweight portable application background. The results have reference to the design of this kind structure.