摘要
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。
To investigate the transmission and diffraction phenomena when air shock waves attack flexible explosion-proof walls, the air blast pressure flow field behind a flexible wall was studied via numerical simulation. The weight of TNT charge in the simulation is 5kg, 10 kg, 15 kg and 20 kg, respectively. The transmission and diffraction phenomena of air shock waves behind the flexible wall are analyzed and the pressure time histories are compared. Finally, the air blast pressure distributions behind the wall are studied. The results show that there are mainly two peak pressures behind the flexible wall, one being the transmitted pressure and the other the diffracted pressure. Transmitted pressure is caused by the motion of the deformed wall and is dependent on the wall's deformation rate. Diffracted pressure is caused by the diffraction of air shock wave propagated over the wall. The distributions of the transmitted pressure and diffracted pressure are different, and hence the analysis of them should be treated differently.
出处
《工程力学》
EI
CSCD
北大核心
2015年第3期241-248,256,共9页
Engineering Mechanics
基金
国家自然科学基金创新研究群体科学基金项目(51021001)
关键词
爆炸力学
冲击波
数值模拟
透射压力
绕射压力
explosion mechanics
air shock waves
numerical simulation
transmitted pressure
diffracted pressure
