WIGWAM水下核爆炸气泡脉动理论计算及数值模拟对比分析  

Comparative Analysis of Theoretical Calculation and Numerical Simulationof Bubble Pulsation in WIGWAM Underwater Nuclear Explosion

作　　者：刘哲函 王晓明[2] 王燕[2] 李健[2] 南德[2] 刘泽玉 曾志 LIU Zhehan;WANG Xiaoming;WANG Yan;LI Jian;NAN De;LIU Zeyu;ZENG Zhi(Department of Engineering Physics,Tsinghua University,Beijing 100084,China;CTBT Beijing National Data Centre,Beijing 100085,China)

机构地区：[1]清华大学工程物理系,北京100084 [2]禁核试北京国家数据中心,北京100085

出　　处：《现代应用物理》2023年第3期240-248,共9页Modern Applied Physics

基　　金：人才工程计划资助项目(D111220401)。

摘　　要：针对水下核爆炸和常规爆炸区分问题,开展了水下爆炸气泡脉动理论计算和数值模拟方法研究。基于气泡脉动能量守恒方程推导了水下爆炸气泡脉动最大半径理论计算公式,通过定义气泡脉动能量的传递因子,递推了后续气泡脉动周期和最大半径的计算公式。开展了水下常规爆炸的气泡脉动数值模拟方法研究,从状态方程、边界条件、人工黏性系数及计算网格设置等方面分析了关键参数设置对数值模拟结果的影响,提出了基于等效缩比定律的水下爆炸数值模拟方法,解决了水下千吨级常规爆炸气泡脉动数值模拟的问题。对WIGWAM试验的气泡脉动能量占比进行了理论计算,并开展了同等当量水下TNT爆炸气泡脉动的数值模拟,对比分析两者气泡脉动参数的结果表明,水下核爆炸第一次、第二次气泡脉动与等效TNT爆炸的差异并不明显,而第三次气泡脉动之间的差异较大,由此提出将第三次气泡脉动周期与第二次气泡脉动周期的比作为识别水下核爆炸的方法。To distinguish the underwater nuclear explosion from conventional explosions,a method of theoretical calculation and numerical simulation for underwater explosion bubble pulsation is studied.Based on the energy conservation equation of the bubble pulsation,the theoretical calculation formula of the maximum radius of the bubble pulsation in underwater explosion is derived.By defining the transfer factors of the bubble pulsation energy,the calculation formula of the subsequent bubble pulsation periods and the maximum radius are obtained.The numerical simulation method of the bubble pulsation in underwater conventional explosion is studied.The influence of the set key parameters on the numerical simulation results is analyzed with the aspects of state equation,boundary conditions,artificial viscosity coefficient,and calculation grid setting.A numerical simulation method of underwater explosions based on the equivalent scaling law is proposed,which is used to numerically simulate the bubble pulsation of equivalent thousand-ton TNT underwater explosion.The proportion of the bubble pulsation energies in WIGWAM test is calculated theoretically,and the numerical simulation of the bubble pulsation in underwater TNT explosion with the same equivalent is carried out.The results show that the difference of the first and the second bubble pulsations between underwater nuclear explosion and the equivalent TNT explosion is not obvious,but the difference of the third bubble pulsations is larger.Therefore,the ratio of the third bubble pulsation period to the second bubble pulsation period is proposed as a method to identify the underwater nuclear explosion.

关 键 词：水下核爆炸 气泡脉动 等效缩比 数值模拟 信号识别 

分 类 号：O384[理学—流体力学] TL99[理学—力学]