2022 Fiscal Year Final Research Report
Effect of traveling-wave control on fluid flow and heat transfer in turbulent Taylor-Couette flow
Project/Area Number |
20K04259
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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 19010:Fluid engineering-related
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Research Institution | Osaka Electro-Communication University (2022) Tokyo University of Agriculture and Technology (2020-2021) |
Principal Investigator |
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Project Period (FY) |
2020-04-01 – 2023-03-31
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Keywords | 乱流制御 / 抵抗低減 / 進行波状吹き出し吸い込み |
Outline of Final Research Achievements |
Direct numerical simulation was performed to examine the effect of torque-reduction of traveling-wave control on the outer cylinder in a turbulent Taylor-Couette flow. A special focus is laid on the small-amplitude or long-wavelength controls which is able to be implemented to the real applications. The inner-to-outer radius ratio is beyond 0.95. As a result, when the traveling wave propagates in the same direction as the rotation of the inner cylinder, high amplitude is required to gain the torque-reduction effect. The traveling wave which propagates in the opposite direction exhibits the better performance.
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Free Research Field |
流体工学
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Academic Significance and Societal Importance of the Research Achievements |
本研究成果により,テイラー・クエット乱流の流動抵抗低減効果を目的とした進行波状吹き出し吸い込み制御という乱流制御手法の適用可能性が示された.特に,クリアランスの狭い実機を想定した0.95以上という高半径比におけるデータは,これまでほとんど調査報告された例がない.研究の結果,内円筒の回転と反対方向に進行する高振幅の進行波であれば一定以上のトルク低減効果が期待できるが,これは実機における振動抑制問題と相克するため,最終的な設計においては流動抵抗と振動・騒音を総合的に考慮することが必要と結論付けられる.
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