2022 Fiscal Year Final Research Report
Validation of the cavitation ignition hypothesis
Project/Area Number |
20K05020
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 25020:Safety engineering-related
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Research Institution | Japan Aerospace EXploration Agency |
Principal Investigator |
Kobayashi Hiroaki 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 教授 (50353420)
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Co-Investigator(Kenkyū-buntansha) |
吹場 活佳 静岡大学, 工学部, 准教授 (50435814)
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Project Period (FY) |
2020-04-01 – 2023-03-31
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Keywords | Cavitation / Liquid Oxygen |
Outline of Final Research Achievements |
The purpose of this study is to propose and test the hypothesis that cavitation generated in fluids is an "ignition source" and a cause of fire accidents. Cavitation frequently occurs as a familiar phenomenon, such as the falling of a glass of water, and analytical studies of cavitation have indicated that microscopic ultra-high temperature regions are instantaneously generated in the process of bubble collapse. Cases of fires in liquid oxygen systems, which were previously presumed to be ignited by static electricity, can in fact be assumed to be caused by cavitation in liquid oxygen. In this study, we developed a device to generate cavitation by drop impact and succeeded in measuring the generation of high pressure and high temperature due to cavitation, thereby providing a promising clue toward elucidating the phenomenon.
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Free Research Field |
Space propulsion
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Academic Significance and Societal Importance of the Research Achievements |
キャビテーションが、既存の着火源(裸火、火花、静電気、高温、摩擦)には含まれない新たな着火源として定義されれば、火災事故の防止に寄与するとともに、安全工学や流体力学を横断する新たな学術分野の創出につながると期待される。
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