摘要
基于传输线模型,通过将柱坐标系进行旋转变换,建立了斜向放电通道电磁场模型;采用脉冲函数加双指数函数作为通道底部电流,从垂直放电通道电磁场的表达式中推导出斜向放电通道电磁场的计算公式;基于斜向放电通道电磁场模型,研究了不同角度对不同场区地表回击电磁场的影响,认为雷电放电通道越倾斜,雷电流对地面电磁场的影响就越明显。研究了不同回击速度对不同场区地表回击电磁场的影响,结果表明回击速度对电磁场的影响较为明显。
The model of electromagnetic field of oblique discharge channel was built by rotating cylindrical coordinate system based on TL model in this passage;pulse function and double exponential function were used as the functions of channel-base current,and the expressions of electromagnetic field of oblique discharge channel were deduced from that of vertical discharge channel;the effect of different angles on electromagnetic field of lightning return stroke on the surface of the ground wes studied,and it shows that the more oblique the lightning discharge channel,the bigger the effects of lightning current on electromagnetic field on the surface of the ground.The effect of different current velocities on electromagnetic field of lightning return stroke on the surface of the ground was studied,the results show that the effect of the current velocities on electromagnetic field of lightning return stroke on the surface of the ground was more obvious.
出处
《微波学报》
CSCD
北大核心
2012年第2期16-21,共6页
Journal of Microwaves
基金
国家自然科学基金(51077132)
关键词
雷电电磁场
斜向放电通道
回击模型
电流模型
回击速度
lightning electromagnetic field
oblique discharge channel
return stroke model
current model
current velocity of lightning return stroke
