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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。
The height and width of the building are changed. Two-dimensional stochastic lightning pilot model is established by using finite-difference time-domain method. The thunder cloud electrical process is simulated. The up / down pilot lengths generated during thundercloud discharge under different building conditions are analyzed. Point location and stroke length parameters. The simulation results show that when the height of the building is increased from 200 m to 300 m, the length of the downlink leader becomes shorter and the space position of the lower / upper leader increases, and the length of the uplink leader remains unchanged ; To change the height of the building from 200 m to 100 m, the leading length of the downlink increases and the position of the connecting point decreases, and the length of the upstream pilot basically remains unchanged; changing the building width to the same height does not affect the length of the upstream / downstream pilot As well as the spatial location of the connection point; no significant changes have taken place in changing the height, width, stroke length of the building within a certain range.