不同建筑物对雷云电过程的影响分析

Analysis of Impact of Different Buildings on the Thundercloud Electric Process

改变建筑物高度、宽度,利用时域有限差分法建立了闪电先导二维随机模型,模拟了雷云电过程,分析了不同建筑物状态下雷云放电过程中产生的上/下行先导长度、连接点位置和闪击距长度等参数。仿真结果表明:宽度不变,当建筑物高度从200 m增加到300 m时,下行先导的长度变短,同时下/上行导连接点的空间位置随之抬高,上行先导的长度基本不变;改变建筑物高度从200 m减小到100 m,下行先导长度增加并且连接点位置降低,上行先导长度基本保持不变;保持建筑物高度一样,改变建筑物宽度不影响上/下行先导的长度以及连接点的空间位置;改变建筑物高度、宽度,闪击距离长度保持在一定范围内不发生明显变化。

Through changing the building height, width, lightning pilot two-dimensional random model is established by using the finite difference time domain method, the thundercloud electricity process is simulated, the up/down link pilot length in the process of discharge, the location of the connection point and stroke length under different buildings are analyzed and compared with the actual thundercloud discharge process related data. The result shows： in case of the width unchanged, when the building height increased from 200 m to 300 m, the length of down link pilot became shorter, at the same time the connection point location has been raised, the length of the up link pilot basically remain unchanged; change the building height from 200 m to 100 m, down link pilot length increased and the connection point location reduced, the length of the up link pilot still remain unchanged; when the building height keeps still, the change of building width does not produce a significant impact on the up/clown link pilot length and the connection point location; stroke length is not affected by building height and width change and keeps within a certain range.