爆炸实验水池防护性能及动力学响应分析

Protective performance and dynamic response analysis of explosion testing pool

针对爆炸实验水池强度设计问题,利用非线性动力学程序LS-DYNA对10 kg TNT爆炸后的水中冲击波传播规律及爆炸水池结构动态响应情况进行了数值模拟,对空气桶和气泡帷幕削弱水中冲击波的能力进行了定量计算,结果表明:空气桶对冲击波峰值压力削弱作用接近50%,对比冲量削弱作用达到16.2%;气泡帷幕对壁面反射冲击波的削弱作用高达86.2%,对比冲量削弱作用达到75.6%。在此基础上进一步分析了冲击载荷作用以及结构响应机理,指出了内衬钢板和混凝土围堰的危险区域,对爆炸能量在各物质间的分配和传递规律进行了初步探索,为相关爆炸水池的工程设计提供参考。

In this work,in view of the design issues concerning the strength of the explosion testing pool,we simulated numerically the shock wave propagation in water and structural dynamic responses of the testing pool subjected to a 10 kg TNT explosion impact loading using the nonlinear dynamics program LS-DYNA. We also quantitatively calculated the capability of the air tank and the bubble curtain to weaken the shock wave in water. The results show that the weakening effect of the air tank on the shock wave peak pressure and the specific impulse is close to 50% and 16.2%,that of the bubble curtain on the shock wave reflection and the specific impulse is as high as 86.2% and 75.6%. Based on this,we further analyzed the mechanism of the impact loading and the structural response and carried out a preliminary investigation of the distribution and transmission of the explosion energy between each substance. Our work can be used as reference for the engineering design of similar explosion testing pools.