A study on the initiation conditions of upward leaders from large-crab-windmills and the lightning protection methods

大型蟹式风车上行先导启动条件及防雷方法研究

• 批准号: 17360124
• 负责人: WANG Daohong
• 金额: $ 7.12万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360124/
• 关键词: Linghtning; Lightning damage; Winter lightning; Upward leader; Linghtning protection

Lightning to a windmill and its lightning-protection tower was observed in 2005, 2006 and 2007 winter seasons. All lightning recorded are upward lightning and they can be sub-classified into two types according to whether or not their initial upward leaders are preceded by discharge activities occurred in another place, such as in cloud. Wind appears to play a certain role in initiating the latter type of lightning from the tower. Without assistance of nearby lightning discharge activities and strong wind, a rotating windmill tends to have more chance to initiate an upward lightning. The lightning on the tower occurred in all directions. In contrast, the lightning on the windmill occurred either in directions far away from the tower or nearly in vertical directions. A slight difference has been noted in upward progression directions of the two sub-classified types of windmill lightning. We have also obtained evidence of upward aborted leaders that are initiated from high-grounded objects in response to nearby lightning.

2005年、2006年和2007年冬季观察到风车及其避雷塔遭受闪电袭击。所有记录到的闪电都是向上闪电，根据其初始向上先导是否在其他地方（例如云中）发生放电活动，可以将它们分为两种类型。风似乎在从塔上引发后一种闪电的过程中发挥了一定的作用。如果没有附近闪电放电活动和强风的帮助，旋转的风车往往更有机会引发向上的闪电。塔上的闪电向四面八方袭来。相比之下，风车上的闪电要么发生在远离塔的方向，要么发生在接近垂直的方向。风车闪电的两种子分类类型的向上进展方向略有不同。我们还获得了向上中止先导的证据，这些先导是由高地物体响应附近的闪电而引发的。

项目成果

Characteristics of Upward Bipolar Lightning Derived from Simultaneous Recording of Electric Current and Electric Field Change

• 发表时间: 2008
• 作者: Daohong Wang;N. Takagi

Observed characteristics of luminous variation events during the initial stage of upward positive leaders

• 发表时间: 2007
• 期刊: Journal of atmospheric electricity
• 作者: Daohong Wang;N. Takagi;Teiji Watanabe

Observed characteristics of upward leaders that are initiated from a windmill and its lightning protection tower

• DOI: 10.1029/2007gl032136
• 发表时间: 2008-01
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: D. Wang;N. Takagi;T. Watanabe;H. Sakurano;M. Hashimoto

Charge density distribution along a positive upward lightning leader stroke channel

沿正向上闪电先导冲程通道的电荷密度分布

• 发表时间: 2007
• 期刊: Proceedings of International Conference on Atmospheric electricity
• 作者: A. Hazmi;K. Ham;D. Wang;N. Takagi;T. Watanabe;H. Sakurano;M. Hashimoto
• 通讯作者: M. Hashimoto