爆炸冲击波数值模拟及超压计算公式的修正  

Numerical Simulation for Explosion Shock Waves and Correction of Calculation Formula of Overpressure

作　　者：吴彦捷 高轩能[1] 

机构地区：[1]华侨大学土木工程学院,福建厦门361021

出　　处：《华侨大学学报（自然科学版）》2014年第3期321-326,共6页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(51278208);福建省自然科学基金资助项目(2011J01319);中央高校科研业务费专项基金资助项目(JB-JC1005)

摘　　要：应用LS-DYNA有限元程序建立2,4,6-三硝基甲苯(TNT)炸药爆炸的数值模型并进行空爆数值计算,结合常用的经验公式,验证计算模型及参数取值的可信性.基于以上研究,提出冲击波超压修正计算方法,以各经验公式加权平均值作为参考,对数值模拟结果进行修正.结果表明:早期常用的经验公式与数值模拟计算结果分别处于爆炸冲击波超压的中下位值及下限值,均存在低估爆炸冲击波的危险.通过修正计算方法修正后的冲击波超压,可以作为爆炸冲击波超压的中位值.The finite element model of TNT explosion was carried out by LS-DYNA, then the numerical results of air explosion were obtained. Comparing to the empirical formulae, the credibility of the calculation model and parameter se- lection was verified. On the basis of analysis results, the modified calculation method of the shock wave overpressure was proposed, in reference to the weighted average of the empirical formulae, the results of numerical simulation were modi- fied. The research results show that： the common empirical formulae used before and the numerical simulation are in the lower median value and the lower limit value of the blast shock wave overpressure respectively, the risk of the blast shock wave overpressure are likely to be underestimated, but the modified shock wave overpressure based on the modified calcu- lation method could be used as the median value of the blast shock wave overpressure.

关 键 词：爆炸 数值模拟 冲击波 超压公式修正 TNT炸药 

分 类 号：O382[理学—流体力学] TJ55[理学—力学]