环境压力对自由场冲击波传播影响的数值模拟  

Numerical simulation of the influence of environmental pressure on free field shock wave propagation

作　　者：陆军伟 汪泉[1,2] 李志敏 林朝键 刘文震 LU Jun-wei;WANG Quan;LI Zhi-min;LIN Chao-jian;LIU Wen-zhen(School of Chemical Engineering,Anhui University of Science&Technology,Huainan 232001,Anhui,China;Engineering Laboratory of Explosive Materials and Technology of Anhui Province,Huainan 232001,Anhui,China)

机构地区：[1]安徽理工大学化学工程学院,安徽淮南232001 [2]安徽省爆破器材与技术工程实验室,安徽淮南232001

出　　处：《工程爆破》2021年第2期51-57,共7页Engineering Blasting

基　　金：国家自然科学基金面上资助项目(11872002);研究生创新基金资助项目(2019CX2058)。

摘　　要：为了研究环境压力对爆炸冲击波传播的影响,采用非线性有限元AUTODYN建立了TNT自由场爆炸的一维球对称楔形模型,对不同初始环境压力下的爆炸冲击波超压值和波阵面的运动规律进行了分析。结果表明:数值模拟很好地再现了自由场爆炸冲击波的传播过程;常压下的数值模拟结果与常用经典超压公式有所差异,所模拟的冲击波超压值与Henrych公式最为接近;在不同的初始环境压力下,同一测点的TNT超压值会随着环境压力的降低而降低,而波阵面的运动速度则会随着环境压力的降低而升高。当外界环境为绝对真空时,冲击波爆炸产物为介质传播,爆炸产物的传播距离与时间呈线性关系。To study the influence of environmental pressure on the propagation of explosion shock wave,a one-dimensional spherical symmetric wedge-shaped model of TNT free field explosion was established by using nonlinear finite element AUTODYN.The overpressure value of explosion shock wave and the motion law of wave front under different initial environmental pressures were analyzed.The results show that the propagation process of free field explosion shock wave is well reproduced by numerical simulation.The results of numerical simulation at atmospheric pressure are different from those of classical overpressure formula,and the simulated overpressure values of shock wave are closest to those of Henrych formula.Under different initial environmental pressure,the value of TNT overpressure at the same measuring point will decrease with the decrease of environmental pressure,while the velocity of wave front will increase with it.When the external environment is absolute vacuum,the shock wave is generated by explosion products,and the propagation distance of explosion products is linear with time.

关 键 词：冲击波 超压 数值模拟 环境压力 波阵面 

分 类 号：TJ450.1[兵器科学与技术—火炮、自动武器与弹药工程] TD235[矿业工程—矿井建设]