不同起电模式对雷暴云放电过程的影响

Influence of Different Electrification Modes on the Discharge Process of Thunderstorm

为探讨不同感应起电过程在雷暴云起电和放电过程中的作用,基于二维雷暴云起放电数值模式,设计四种起电方案分别对霰与云滴以及霰与冰晶间的感应起电过程进行数值模拟并比较。结果表明:冰相粒子间碰撞的感应电荷分离会使得起电更强;霰和冰晶之间的感应起电过程能够增强主负电荷区和上部正电荷区,并且保持偶极电荷结构不变;霰与冰晶间的感应过程会产生更多的闪电。

In order to study the role of different induction electrification processes during the process of thunderstorm cloud electrification and discharge, based on two-dimensional thunderstorm cloud discharge numerical model, four electrification schemes are designed to study the relationship between grapple and cloud droplet and the relationship between grapple and ice crystal. The electrical process is simulated and compared. The results show that： 1） Induced charge separation from ice-particle collisions will make electrification stronger; 2） the electrification process between the grapple and the ice crystal can enhance the main negative charge region and the positive charge region, and maintain the dipole charge structure; 3） the induction process between the grapple and the ice crystal will produce more lightning.