Study of the influence of space charge on lightning leader stroke progress

空间电荷对雷击先导过程影响的研究

• 批准号: 14550262
• 负责人: TAKAGI Nobuyuki
• 金额: $ 2.3万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550262/
• 关键词: space charge density; thundercloud; sound wave; lightning protection; real time sensing

In this study, our final goal is to make clear the relationship between the failure of lightning shield and the space charge around power line towers. To succeed this purpose, we have done three studies, 1.space charge measurement by new supersensitive system using sound wave, 2.effect of wind on the corona discharge current from a needle, 3.high speed video of upward lightning leader stroke.In the study 1., we estimated the position and the density of the space charge charged in water vapor with errors of 1% to 14% and 10% and 77%, respectively. The charge density over needles mounted on a pipe with 14.5m high under thundercloud is about 100nC/m3.In the study 2., we found out that the corona discharge current from a needle increases with the wind speed, but decreases with the wind speed when there is an another needle in the windward.In the study 3., the speed of the upward leader stroke increases with height. And some small discharges occur associated with leader progress.From above the results, we concluded that the space charge have influences on the initiation and the progress of leader stroke from a tall tower under winter thundercloud.

本研究的最终目的是明确避雷针失效与杆塔周围空间电荷之间的关系。为了实现这一目的，我们进行了三项研究：1.利用超灵敏的声波系统测量电荷; 2.风对针电晕放电电流的影响; 3.闪电上行先导放电的高速摄像。1.space我们估计了水蒸气中空间电荷的位置和密度，误差分别为1%-14%和10%和77%。在雷雨云下，安装在14.5m高管道上的针上的电荷密度约为100 nC/m ~ 3。研究发现，当迎风面有一根针时，电晕放电电流随风速的增大而增大，而当迎风面有另一根针时，电晕放电电流随风速的增大而减小。向上先导冲程的速度随着高度而增加。从以上结果可以看出，空间电荷对冬季雷暴云中高塔先导放电的发生和发展有一定的影响。

项目成果

Initiation and propagation characteristics of upward positive leaders

向上积极领导者的启动和传播特征

• 发表时间: 2004
• 期刊: Proceedings of EMC04, Sendai
• 作者: D.Wang;N.Takagi;T.Watanabe
• 通讯作者: T.Watanabe

Luminosity characteristics of multiple dart leader/return stroke sequences measured with a high‐speed digital image system

• DOI: 10.1029/2003gl018613
• 发表时间: 2004-01
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: D. Wang;N. Takagi;X. Liu;T. Watanabe;A. Chihara

Initiation and propagation characteristics of upward positive leader

向上积极领导者的启动和传播特征

• 发表时间: 2004
• 期刊: Proceedings of EMG04,Sendai
• 作者: D.Wang;N.Takagi;T.Watanabe
• 通讯作者: T.Watanabe

D.Wang, N.Takagi, X.Liu, T.Watanabe, A.Chihara: "Luminosity characteristics of multiple dart leader/return stroke sequences measured with a high-speed digital image system"Geophysical Research Letters. (in press). (2004)

D.Wang、N.Takagi、X.Liu、T.Watanabe、A.Chihara：“用高速数字图像系统测量的多个飞镖前导/回程序列的光度特性”地球物理研究快报。

Development of space charge sensing system

空间电荷传感系统的开发

• 发表时间: 2003
• 期刊: Proceedings of 12th International Conference on Atmospheric Electricity, Versailles, France vol.1
• 作者: N.Takagi;D.Wang;T.Watanabe;K.Yamaguchi;M.Kobori
• 通讯作者: M.Kobori