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1993 Fiscal Year Final Research Report Summary

Basic Research of Water Triggered Lightning and Development of Fountain

Research Project

Project/Area Number 04805026
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 電力工学
Research InstitutionKumamoto University

Principal Investigator

MAEDA Sadao  Kumamoto University Engineering, Professor, 工学部, 教授 (10040370)

Co-Investigator(Kenkyū-buntansha) TAKAKI Kouichi  Oita National College of Technology, Lecturer, 講師 (00216615)
KATSUKI Sunao  Kumamoto University Engineering, Research Associate, 工学部, 助手 (80233758)
AKIYAMA Hidenori  Kumamoto University Engineering, Associate Professor, 工学部, 助教授 (50126827)
Project Period (FY) 1992 – 1993
KeywordsLIGHTNIG / TRIGGERED LIGHTNING / WATER TRIGGERED LIGHTNING / WATER JET / ROCKET TRIGERED LIGHTNING / LASER TRIGGERED LIGHTNING
Research Abstract

A new method to trigger lightning by a water jet is proposed and investigated experimentally by using an impulse generator. Lightning has been triggered successfully by using a thin wire that is pulled up by a rocket. However, the use of rockets has made it impossible to perform the experiment in urban areas. Here it is proposed to use a water column instead of the thin wire. A spherical electrode of 20mm in diameter and a plane electrode, or plane electrodes with an area of 1mx1m are used for the basic experiment of triggering the lightning by a water jet. The obtained results are summarized as follows ;
(1)The discharge of an upward leader begins between the tip of water jet and the electrode with a high voltage.
(2)The current flows through the water column after the discharge in the air.
(3)The discharge at the surface of the water column occurs by increasing the voltage.
(4)The 50% flashover voltage decreases considerably as the height of the water jet increases. The decrease of the 50% flashover voltage by the water jet is equal to the decrease in the case of using a metal conductor instead of the water jet.
(5)A system to produce the water jet, which was composed of a water chamber and a high pressure chamber of air, was constructed. The experimental results and the analyzes of data show that a water column with 100m height is able to be made under a thunder cloud.

  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] 高木浩一: "噴水による長ギャップ放電の誘導" 電気学会論文誌. 113-A. 552-553 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 高木浩一: "電極間へ挿入した水柱の抵抗率とフラッシオーバ電圧の関係" 電気学会論文誌. 114-A. 61-62 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 高木浩一: "水誘雷の基礎実験" 静電気学会誌. 117. 110-116 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Takaki, H.Akiyama and S.Maeda: "Induction of a Long Gap Discharge by a Water Jet" Transaction of IEE Japan. Vol.113A. 552-553 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Takaki, H.Akiyama and S.Maeda: "Influence of Resistivity of Water placed in Gap on Flashover Voltage" Transaction of IEEE Japan. Vol.114A. 61-62 (1994)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-03-27  

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