高空核爆炸早期碎片等离子体模拟  

Plasma Simulation for Early-Stage Debris in High Altitude Nuclear Explosions

作　　者：张俊杰 彭国良[1,2] 任泽平 ZHANG Junjie;PENG Guoliang;REN Zeping(Northwest Institute of Nuclear Technology,Xi’an 710024,China;College of Mechanical and Electrical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]西北核技术研究所,西安710024 [2]北京理工大学机电工程学院,北京100081

出　　处：《现代应用物理》2023年第2期110-116,共7页Modern Applied Physics

基　　金：国家自然科学基金资助项目(12105227)。

摘　　要：针对高空核爆炸早期碎片等离子体模拟,提出了高空核爆炸等离子体演化过程必须经历的4个阶段,包括链式反应阶段、早期过渡期、非平衡碰撞期和非平衡无碰撞期。在此基础上,给出了用于描述早期过渡期、非平衡碰撞期和非平衡无碰撞期3个阶段的适用模型和基本方程:早期过渡期适用相对论性多温流体,用相对论性流体方程描述;非平衡碰撞期适用相对论性碰撞等离子体,用相对论性玻尔兹曼-麦克斯韦耦合方程描述;非平衡无碰撞期适用非相对论性无碰撞等离子体,用流体-PIC(particle-in-cell)混合模拟描述。In this paper,four different stages that must be experienced in plasma evolution process of early-stage debris in the high altitude nuclear explosion are proposed,that is,chain-reaction stage,early transition stage,non-equilibrium collision plasma stage,and non-equilibrium collision-free plasma stage.On this basis,applicable models and basic equations for describing the early transition period,the non-equilibrium collision period,and non equilibrium collision-free period are provided.For example,in the early transitional period,relativistic multi-temperature fluids can be described by using relativistic fluid equations.The non-equilibrium collision period is applicable to relativistic collision plasmas,described by using the relativistic Boltzmann-Maxwell coupling equation.The non-equilibrium collision-free period is applicable to non relativistic collision free plasma,which can be described by fluid-PIC(particle-in-cell)hybrid simulation.

关 键 词：玻尔兹曼-麦克斯韦耦合方程 等离子体模拟 流体-PIC混合模拟 多温流体 碰撞等离子体 

分 类 号：TL65[核科学技术—核技术及应用] O531[理学—等离子体物理]