空间电荷水平方向分布范围对闪电放电类型影响的数值模拟

Numerical Simulation on the Influence of Space Charge Horizontal Distribution Range on Lightning Discharge Types

大量研究表明,闪电放电类型与雷暴云空间电荷分布密切相关,但雷暴云电荷分布对闪电放电影响的定量化研究还比较少见。采用空间电荷分布模型、随机放电方案,进行二维高分辨率闪电放电模拟实验,主要研究电荷区域水平尺度范围对闪电放电类型的影响。结果表明:当雷暴云为三极性空间分布时,随着底部电荷水平范围的扩大,闪电类型从正极性云闪向负地闪再向反极性云闪变化。当存在云顶屏蔽层时,情况与三极性的相似,而区别在于发生正常极性云闪的电荷密度范围变小,负地闪的负先导首先会在云区内有一段水平传播的趋势。

A large the thunder cloud space number of studies have shown that lightning discharge type is closely related to charge distribution, but the quantitative research on the influence of the thunder cloud charge distribution to lightning discharge is relatively rare. The space charge distribution model and random discharge scheme are adopted to simulate two-dimensional high-resolution lightning discharge. The main research is the influence of the horizontal scale range on the type of lightning discharge. Results show that under the three polarity charge distribution, with extension of horizontal range of the positive charge at the bottom of the thunder cloud, the type of lightning changes from positive to negative and vice versa. When there is a cloud top shield, it is similar to three polarity, and The difference is that the charge density range of normal polar cloud flash becomes smaller, The negative leader of negative ground flash will firstly have a horizontal transmission trend in the cloud area.