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.

在这项研究中，我们的最终目标是清除闪电防护罩的故障与电源线塔围绕空间充电之间的关系。为了成功实现这一目的，我们进行了三项研究，1。新的超敏感系统的空间充电测量，使用声波，2。对电晕的风向对电动机的电流产生影响，3。向上闪电的领导者的高速视频。在研究1.中，我们估计了在水蒸气中以1％至1％至14％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％和77％的相分为相差的空间电荷的密度。在雷霆云下面安装在14.5m高的管道上的针上的电荷密度约为100nc/m3。在研究2中。在研究2中，我们发现，导管的电晕放电电流随风速而增加，但是当风中有另一个针时，随着风速的速度降低。在研究3中，在研究3.，随着高度的高度而增加。从领先的进步之上，我们得出的结论是，太空指控对冬季雷霆之下高高的塔楼的起始和中风的进步影响。

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

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