铝单丝在可调预脉冲作用下的Z箍缩动力学行为实验和数值模拟研究  

Experimental and numerical studies on the dynamic behavior of single aluminum wire Z-pinch co-driven by the adjustable prepulse and main pulse currents

作　　者：陈紫维 吴坚[1] 姜志远 王振宇 王威 卢元博 李阳 盛亮[2,3] CHEN ZiWei;WU Jian;JIANG ZhiYuan;WANG ZhenYu;WANG Wei;LU YuanBo;LI Yang;SHENG Liang(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;National Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Xi’an 710024,China;Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]强脉冲辐射环境模拟与效应全国重点实验室,西安710024 [3]西北核技术研究所,西安710024

出　　处：《中国科学：物理学、力学、天文学》2023年第7期40-50,共11页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:51922087);陕西省自然科学基础研究计划(编号:2019JCW-04)资助项目。

摘　　要：为了研究预脉冲电流对Z箍缩内爆动力学行为的影响,本文首先基于双脉冲Z箍缩实验平台“秦-1”装置研究了铝单丝Z箍缩在不同预、主脉冲间隔下的内爆特性.铝丝在预脉冲作用下被加热汽化形成芯晕结构并膨胀,在主脉冲作用下发生雪耙特性的箍缩内爆,预脉冲作用下的晕等离子体对内爆行为有显著影响.其次,基于磁流体模型计算了预脉冲作用后的密度、温度、速度分布,以及进一步主脉冲作用后的内爆壳层参量分布.计算结果的边界轨迹与实验测量基本一致,预脉冲作用下的单丝Z箍缩动力学行为可以分为晕等离子体膨胀、晕等离子体内爆、晕与丝芯共同内爆、滞止辐射4个阶段,在这种雪耙内爆特性下,洛伦兹力对壳层外部的晕层做功,热压对壳层内部的未扰动等离子体做功,形成等离子体堆积.The implosion characteristics of preconditioned aluminum single-wire Z-pinch under different pre-main pulse intervals are studied based on the double-pulse Z-pinch experimental platform“Qin-1”facility to study the effect of prepulse current on the dynamic behavior of Z-pinch implosion.The prepulse current heats and vaporizes the aluminum wire,forming the core-coronal structure,which then expands.The snow plow then implodes under the main pulse current.Secondly,based on the magneto fluid model,the density,temperature,and velocity distributions for the prepulse current and the implosion shell distributions for the main pulse current are calculated.The calculated results’boundary trajectory is generally consistent with the experimental measurement.The dynamic behavior of a preconditioned single-wire Zpinch can be divided into four stages:corona plasma expansion,corona plasma implosion,core and coronal plasma implosion,and stagnation.Lorentz force works on the outer layer of the coronal plasma,and thermal pressure works inside the snow-plow implosion shell of undisturbed plasma to accumulate plasma under the snow-plow implosion.

关 键 词：Z箍缩 预脉冲调控 动力学过程 动力学行为 辐射磁流体 

分 类 号：TL81[核科学技术—核技术及应用]