2022 Fiscal Year Final Research Report
Toward Improvement of Prediction of Cavitation under Real Fluid Flow Condition: Understanding of Dissolved Gas Effect and Its Modeling
| Project/Area Number |
20K04269
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 19010:Fluid engineering-related
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| Research Institution | Kyushu University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
津田 伸一 九州大学, 工学研究院, 准教授 (00466244)
片山 雄介 九州大学, 工学研究院, 助教 (20778815)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | キャビテーション / 流体機械 / 溶存気体 |
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| Outline of Final Research Achievements |
Toward the enhancement of prediction accuracy of cavitation performance of hydraulic machinery under real fluid condition, which can enable us more reliable design and operation of machines, the present study has focused on one of the important real fluid factors against cavitation, that is a dissolved gas effect, and investigated the determination mechanism of internal pressure of cavity and the transport mechanism of dissolved gas including the mass transfer rate at cavity interface through direct pressure measurement, high-speed camera observation, flow measurement and etc. In addition, the numerical model of dissolved gas effect was proposed considering the actual physics behind the phenomena. Through the comparisons with experiments, the proposed model was well validated.
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| Free Research Field |
流体工学
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| Academic Significance and Societal Importance of the Research Achievements |
キャビテーションの相似則の成否を左右する溶存気体の効果について多方面からの分析を行うことで，キャビティの内圧の決定機構ならびに気液界面での物質伝達機構の現象論的理解，機構論的理解を大きく増進したこと，溶存気体効果を物理的に正しく表現した新たな流体力学モデルを構築したことは，学術的に有意義である．また，これらの成果は，キャビテーションの予測精度向上に限らず，流体力学やトライボロジーなど分野間で異なる蒸気性・気体性キャビテーションの統一的理解，さらにはエネルギー，医療を始め様々な分野で見られる気液二相流に広く共通した課題解決にも繋がると考えられ，社会的な意義も有する．
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