2021 Fiscal Year Final Research Report
Elucidation of Flow-Flame Interference Mechanisms and Optimal Conditions for the Development of Innovative Fire Extinguishing Methods Using Ultrasonic Waves
Project/Area Number |
19K04944
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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 25030:Disaster prevention engineering-related
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Research Institution | Muroran Institute of Technology |
Principal Investigator |
Hirota Mitsutomo 室蘭工業大学, 大学院工学研究科, 准教授 (50333860)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | 超音波 / 消火 / 流れの可視化 |
Outline of Final Research Achievements |
We proposed a new fire extinguishing method using sound (ultrasonic waves) to easily extinguish a fire with little power in an enclosed space where water is not available, such as an operating room. In a space where ultrasonic waves form traveling and standing waves, the flow field is deformed by pressure oscillation. By applying this sound effect to the base of the flame, the reaction of the flame in the backstream was suppressed and the fire was extinguished. In this study, the mechanism of flame extinction in ultrasound was investigated by visualizing the changes in the flow field by laser measurement and contrasting them with flame behavior.
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Free Research Field |
燃焼工学
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Academic Significance and Societal Importance of the Research Achievements |
震災の二次災害などの同時多発的に発生した火災に対して,消防隊の消火活動が遅れた場合でも無人で抑制・消火ができるような抜本的な対策・技術開発が必要である。しかも電源喪失・断水・閉空間などの消火に厳しい条件が重なることを想定しなければならない。本研究成果により,超音波定在波の効果で発生した流れによって火炎や発熱源が変形・除去されて小さくなり,消火に至るメカニズムが明らかになった。これにより,消火剤として水を使用できない閉空間において発生した,まだ規模の小さい火災に対して初期消火装置として適用が可能であることが示された。
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