A transient model of lightning breakdown process based on photographic measurements
A transient model of lightning breakdown process based on photographic measurements
复制标题
基于照相测量的闪电击穿过程瞬态模型
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
W. Schufft
中科院分区：
文献类型：
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作者：
A. Shirvani;K. Malekian;W. Schufft
本文对雷电冲击下的正极预放电进行了分析。对S=4m以下的气隙施加了高达u̅=2.4 mV的标准雷电电压，测量了棒电极在mA范围内的预放电电流。此外，在预放电在大气中生长的很短时间内(μS-Rang)，用高速相机从预放电的瞬时结构中记录了一些高速照片。根据所拍摄的照片，计算了电荷分布。作为主要目标，对电荷模拟方法进行了改进，以计算大气中预放电发展过程中电离和去电离(复合)活动产生的空间电荷的存在时的电场。计算了预放电过程中(如200 ns左右)的电场变化。模拟结果可信，验证了空气中预放电发展速度与电场的依赖关系。
In this paper, the positive pre-discharge under lightning voltage impulses has been analyzed. The standard lightning voltages up to u̅ = 2.4 MV have been applied to the air gaps up to s = 4 m. The pre-discharge current of rod-electrode in mA-range has been measured. Additionally, during the very short time that the pre-discharges are growing in the atmospheric air (μs-rang), some high speed photos have been recorded from the instantaneous structure of pre-discharge by a high speed camera. Based on the taken photos, the electric charge distribution has been calculated. As the main goal, the charge simulation method has been modified to calculate the electric field with the existence of the spatial electric charge, which has been produced by the ionization and deionization (recombination) activities during the development of pre-discharge in the atmospheric air. The variation of the electric field during the pre-discharge (e.g. during a period of about 200 ns) has been calculated. The simulations demonstrate plausible results and verify the dependency of the pre-discharge development velocity in the air on the electric field.