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工程力学  2015 

空气冲击波作用于柔性防爆墙的透射和绕射效应分析

Keywords: 爆炸力学,冲击波,数值模拟,透射压力,绕射压力

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Abstract:

为研究爆炸空气冲击波作用于柔性防爆墙后发生的透射和绕射现象及规律,采用数值模拟方法计算了防爆墙在5、10、15和20kg四种药量TNT炸药爆炸冲击波作用下墙后压力流场的变化,分析了墙后发生的透射和绕射现象,比较了压力波形的变化特点,得到了墙后压力场变化分布规律。计算结果表明,柔性墙背后的压力存在两个主要峰值,分别为透射压力峰值和绕射压力峰值。透射压力峰值由柔性墙体变形运动引起,并与墙体变形速率有关;绕射压力峰值由冲击波在墙顶绕射传播引起。透射压力与绕射压力的分布与变化规律不同,需区别对待分析。

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