介质击穿模型参数对雷电先导放电数值模拟的影响  

Effect of Different Parameters of Dielectric Breakdown Model on Numerical Simulation of Lightning Discharge

作　　者：万浩江[1] 魏光辉[1] 陈亚洲[1] 陈强[1] 

机构地区：[1]军械工程学院静电与电磁防护研究所,河北石家庄050003

出　　处：《河北师范大学学报（自然科学版）》2012年第3期263-268,共6页Journal of Hebei Normal University：Natural Science

基　　金：军队科研计划(7130933);国家自然科学基金(51077132)

摘　　要：为研究介质击穿模型参数的选取对雷电先导放电数值模拟结果的影响,以雷云荷电模型和WZ模型为基础,模拟计算了三维先导放电通道在50m空间分辨率下的分形维数和先导临近对地面电场峰值的增强程度.统计分析结果表明:分形维数随着概率指数和电场击穿阈值的增大而减小,但随着通道内电场的增大先减小而后基本趋于稳定,且概率指数对分形维数的影响程度最为剧烈,电场击穿阈值次之,通道内电场的影响相对最弱;地面电场峰值的增强程度随着通道内电场和电场击穿阈值的增大而减小,但随着概率指数的增大先减小而后基本趋于稳定,且通道内电场对地面电场峰值增强程度的影响最为剧烈,概率指数次之,电场击穿阈值的影响相对最弱.Based on the thundercloud model and WZ model,the fractal dimension and enhanced level of E-field on the ground due to approach of the 3-D lightning channel at 50 m resolution are calculated to study the effect of different parameters of dielectric breakdown model on numerical simulation of lightning discharge.According to the statistical analysis results,fractal dimension decreases with increasing probability exponent and critical electric field threshold,and decreases at beginning and then stabilizes with increasing internal electric field of the channel.Additionally,the degree of influences of the probability exponent on the fractal dimension is more than that of critical electric field threshold while internal electric field of the channel is the least.Enhanced level of E-field on the ground due to approach of the leader decreases with increasing internal electric field of the channel and critical electric field threshold,and decreases at beginning and then stabilizes with increasing probability exponent.Additionally,the degree of influences of the internal electric field on the enhanced level is more than that of probability exponent while critical electric field threshold is the least.

关 键 词：介质击穿模型 雷电放电 分形 数值模拟 雷云模型 

分 类 号：TM86[电气工程—高电压与绝缘技术] P427.3[天文地球—大气科学及气象学]