雷电回击速度非单调变化对电场波形的影响分析  

Impact of non-monotonic change of return stroke velocity on electric field waveform

作　　者：贾晟 李云 孙征 石立华 邱实 JIA Sheng;LI Yun;SUN Zheng;SHI Lihua;QIU Shi(Army Engineering University of PLA,Nanjing 210007,China)

机构地区：[1]陆军工程大学,南京210007

出　　处：《电波科学学报》2020年第2期234-241,共8页Chinese Journal of Radio Science

基　　金：国家重点研发计划(2017YFC1501505);国家自然科学基金(41675002)。

摘　　要：针对回击速度的非单调变化,采用回击通道分段的思想,建立了速度非单调变化条件下的回击工程模型,并检验了该模型的有效性与准确性.基于变速度的回击工程模型,分析了回击速度非单调变化对电场的影响,发现回击速度主要通过影响电场辐射场分量来改变回击电场波形,并导致回击电场出现次峰现象.文中还分析了回击速度的不同变化趋势对电场波形的影响和速度峰值所在高度不同时电场的变化规律.结果表明:当速度峰值所对应高度不变的情况下,回击速度增长越快,电场曲线次峰的上升段越陡;速度衰减越慢,次峰之后的凹陷程度越不明显;速度峰值所在高度越低,电场次峰出现越早,表明回击速度的变化对回击波形的精细结构有显著影响.通过建立变速度的回击工程模型,可加强对电场波形精细结构的理解与认识.Due to the non-monotonic change of the return-stroke velocity(RSV),the return-stroke engineering model under the condition of non-monotonic speed is established by dividing the return-stroke flash channel into piecewise linear segments in this paper.The validity and accuracy of the model are verified.Based on the varied speed return-stroke engineering model,the impact of the non-monotonic change of the RSV on the electric field is analyzed.It is found that the RSV mainly acts on the electric field waveform by affecting the radiation field component,and causes the phenomenon of the secondary peak of the electric field.This paper also analyzes the influence of different speed trends on the electric field waveform and the variation of the electric field at the height of the velocity peak.It is shown that when the height corresponding to the peak of the velocity is constant,the faster the RSV increases,the steeper the rising section of the secondary hump of the electric field is;the slower the velocity decays,the less apparent the sunk depth is after the secondary hump.It is indicated that the non-monotonic trend of the RSV has significant influence on the fine structure of electric field.Establishing the new return-stroke engineering model is a good way for us to enhance the understanding and knowledge of the fine structure of electric field.

关 键 词：雷电 回击速度 非单调变化 回击模型 电场变化 

分 类 号：O441.4[理学—电磁学]