弯曲雷电回击通道的建模及其辐射场计算  

Formulation the Model of a Kind of Tortuous Lightning Channel and Calculation of Its Radiated Fields

作　　者：张岩[1] 刘福贵[1] 汪友华[1] 王川川[2] 刘荣美[1] 

机构地区：[1]河北工业大学电磁场与电器可靠性省部共建重点实验室,天津300130 [2]军械工程学院电气工程系,石家庄050003

出　　处：《电工技术学报》2013年第S2期146-151,共6页Transactions of China Electrotechnical Society

基　　金：国家重点基础研究发展计划(973计划)前期研究专项课题资助项目(2012CB723306)

摘　　要：在对雷电回击过程产生的电磁辐射场进行计算时,大部分文献都假设云地放电通道是一条直线,但直线雷电回击通道模型不能准确反映雷电回击通道的物理特性。本文对雷电弯曲回击通道进行了建模,并提出了回击通道辐射电磁场有效观察距离的概念。本模型可以精确刻画雷电辐射电磁场波形的次峰和振荡等特点,模拟其高频频谱分量。研究了弯曲通道的电流线段倾斜角度、雷电流回击速度、观察距离对其辐射电磁场的影响。When calculating the radiated fields generated from lightning stroke return,major literatures assume that cloud-to-ground path is a straight line.But straight-line model does not reflect the physical features of lightning return stroke channel exactly.In this paper,the model of a tortuous lightning channel is formulated,and the concept of effective observable distance of lightning return stroke channel's radiated field is proposed.This model can precisely describe the sub-peaks and oscillation of radiated fields,and model the high frequency spectrum.In addition,this paper also discusses the effects that current segment's tilt angle,current propagating velocity and observable distance have on radiated fields.

关 键 词：垂直雷电通道 弯曲雷电通道 辐射场 观察距离 

分 类 号：P427.3[天文地球—大气科学及气象学]