期刊信息
- 刊名： 河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
- 主办： 河北师范大学
- ISSN： 1000-5854
- CN： 13-1061/N
- 中国科技核心期刊
- 中国期刊方阵入选期刊
- 中国高校优秀科技期刊
- 华北优秀期刊
- 河北省优秀科技期刊
Effect of Different Parameters of Dielectric Breakdown Model on Numerical Simulation of Lightning Discharge
摘要/Abstract
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.