单级、双级及四级FLTD电磁及应力分布特性研究  

Electromagnetic and Stress Distribution Characteristics of Four-Stage FLTD

作　　者：李贞昕 张嘉辉 邱浩 王曙鸿[1] LI Zhenxin;ZHANG Jiahui;QIU Hao;WANG Shuhong(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University/Shaanxi Key Laboratory of Smart Grid,Xi’an Jiaotong University:Xi’an 710049,China)

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室、西安交通大学陕西省智能电网重点实验室,西安710049

出　　处：《现代应用物理》2022年第4期44-52,共9页Modern Applied Physics

基　　金：国家自然科学基金资助项目(51790521)。

摘　　要：快脉冲直线型变压器驱动源(fast linear transformer driver,FLTD)是一种新型脉冲功率源装置,工作时,腔体内电磁场剧烈变化。四级共用腔体结构的FLTD装置可在百纳秒内产生数百千安的脉冲电流,本质上是能量在时间和空间上的压缩,实现功率的增益和能量密度的提高,因此,该装置对结构机械强度的要求较高。首先,研究了单级、两级与四级FLTD装置的放电规律与电磁场分布;其次,研究了单支路带负载模型工作时装置本身的范式应力与形变,寻找装置的应力集中点与形变最大位置,为增强装置机械强度及提高装置结构稳定性提供理论支撑。研究表明,单级、两级与多级FLTD单支路带负载模型的应力主要集中在各级单支路电容放电端口附近,四级模型范式应力最大值为2×10^(8)Pa,远小于材料限值,最大形变量为0.03 mm,电磁冲击不会对模型结构造成明显影响,该FLTD结构具有良好的机械稳定性。Fast linear transformer driver(FLTD)is a new type of pulse power source.When the FLTD is operating,the electromagnetic field in the cavity changes dramatically,the four stages FLTD device can directly generate high-power pulsed current with 100 ns rise time and mega-ampere amplitude.Essentially,it is the compression of energy in time and space to achieve power gain and energy density,which leads to the device having high requirements on the mechanical strength of the structure.Firstly,the discharge pattern and electromagnetic field distribution of single stage,two stages,and four stages FLTD devices are studied.Then,the Von Mises stress and deformation of the device are studied when the single-brick model with load works,and the stress concentration point and the maximum deformation position of the device are found.It provides theoretical support for enhancing the mechanical strength of the device and improving the structural stability of the device.The research shows that the Von Mises stress of the single stage,two staged,and four stages FLTD single-brick models is mainly concentrated near the single-brick capacitor discharge port of each stage,and the maximum Von Mises stress of the four stages model is 2×10^(8) Pa,which is far less than the material limit.The maximum deformation is 0.03 mm,and the electromagnetic shock will not have a significant impact on the model structure.Therefore,the FLTD structure has good mechanical stability.

关 键 词：快脉冲直线型变压器驱动源(FLTD) 数值计算 电磁场 结构场 

分 类 号：TM89[电气工程—高电压与绝缘技术] TL51[核科学技术—核技术及应用]