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Numerical evaluation of the clearance geometries effect on the flow field and performance of a hydrofoil

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  • Guo, Qiang
  • Zhou, Lingjiu
  • Wang, Zhengwei

Abstract

The blade tip leakage flow with efficiency losses and cavitation phenomena is a concern for the low-head tidal power units. A simplified case of NACA0009 hydrofoil in a water tunnel is used to investigate the effects of tip clearance geometries including the foil tip shape and gap width on the flow features and foil performance. Steady non-cavitating simulations are implemented for a round tip foil and a sharp tip foil with two incidence angles (α = 10° and 5°) and different normalized gap width (τ). The minimum pressure is used to reflect the normalized vortex intensity (Γ*) and cavitation characteristics. The Γ*-τ curves at different streamwise positions show that the sharp tip foil generates relatively weaker tip leakage vortex with more flat curves, but its higher Γ* of tip separation vortex in wider gaps increases the risk of clearance cavitation. The flow features on a cross section inside the gap suggest that the sharp tip reduces the leakage flow losses and increases the velocity gradient due to the boundary layer separation. The lift coefficient is a little higher for the sharp tip foil than the round tip foil, with small differences for α = 5° but noticeable deviations for α = 10° especially within 0.3<τ < 1.

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  • Guo, Qiang & Zhou, Lingjiu & Wang, Zhengwei, 2016. "Numerical evaluation of the clearance geometries effect on the flow field and performance of a hydrofoil," Renewable Energy, Elsevier, vol. 99(C), pages 390-397.
    • Handle: RePEc:eee:renene:v:99:y:2016:i:c:p:390-397
    DOI: 10.1016/j.renene.2016.06.064
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    References listed on IDEAS

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    1. Luo, Yongyao & Wang, Zhengwei & Liu, Xin & Xiao, Yexiang & Chen, Changkun & Wang, Haoping & Yan, Jianhua, 2015. "Numerical prediction of pressure pulsation for a low head bidirectional tidal bulb turbine," Energy, Elsevier, vol. 89(C), pages 730-738.
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    2. Wang, Like & Feng, Jianjun & Lu, Jinling & Zhu, Guojun & Wang, Wei, 2024. "Novel bionic wave-shaped tip clearance toward improving hydrofoil energy performance and suppressing tip leakage vortex," Energy, Elsevier, vol. 290(C).
    3. Liu, Yabin & Tan, Lei, 2020. "Influence of C groove on suppressing vortex and cavitation for a NACA0009 hydrofoil with tip clearance in tidal energy," Renewable Energy, Elsevier, vol. 148(C), pages 907-922.
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    5. Kan, Kan & Binama, Maxime & Chen, Huixiang & Zheng, Yuan & Zhou, Daqing & Su, Wentao & Muhirwa, Alexis, 2022. "Pump as turbine cavitation performance for both conventional and reverse operating modes: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 168(C).
    6. Han, Yadong & Liu, Yabin & Tan, Lei, 2022. "Method of variable-depth groove on vortex and cavitation suppression for a NACA0009 hydrofoil with tip clearance in tidal energy," Renewable Energy, Elsevier, vol. 199(C), pages 546-559.
    7. Zhenwei Huang & Yadong Han & Lei Tan & Chuibing Huang, 2019. "Influence of T-Shape Tip Clearance on Energy Performance and Broadband Noise for a NACA0009 Hydrofoil," Energies, MDPI, vol. 12(21), pages 1-13, October.
    8. Shamsuddeen, Mohamed Murshid & Park, Jungwan & Choi, Young-Seok & Kim, Jin-Hyuk, 2020. "Unsteady multi-phase cavitation analysis on the effect of anti-cavity fin installed on a Kaplan turbine runner," Renewable Energy, Elsevier, vol. 162(C), pages 861-876.
    9. Liu, Yabin & Tan, Lei, 2018. "Tip clearance on pressure fluctuation intensity and vortex characteristic of a mixed flow pump as turbine at pump mode," Renewable Energy, Elsevier, vol. 129(PA), pages 606-615.
    10. Ahn, Soo-Hwang & Zhou, Xuezhi & He, Lingyan & Luo, Yongyao & Wang, Zhengwei, 2020. "Numerical estimation of prototype hydraulic efficiency in a low head power station based on gross head conditions," Renewable Energy, Elsevier, vol. 153(C), pages 175-181.
    11. Liu, Yabin & Tan, Lei, 2018. "Method of C groove on vortex suppression and energy performance improvement for a NACA0009 hydrofoil with tip clearance in tidal energy," Energy, Elsevier, vol. 155(C), pages 448-461.
    12. Liu, Yabin & Tan, Lei, 2020. "Method of T shape tip on energy improvement of a hydrofoil with tip clearance in tidal energy," Renewable Energy, Elsevier, vol. 149(C), pages 42-54.
    13. Yabin Liu & Lei Tan & Binbin Wang, 2018. "A Review of Tip Clearance in Propeller, Pump and Turbine," Energies, MDPI, vol. 11(9), pages 1-30, August.
    14. Zhang, Mengjie & Huang, Biao & Wu, Qin & Zhang, Mindi & Wang, Guoyu, 2020. "The interaction between the transient cavitating flow and hydrodynamic performance around a pitching hydrofoil," Renewable Energy, Elsevier, vol. 161(C), pages 1276-1291.
    15. Chen, Weisheng & Xiang, Qiujie & Li, Yaojun & Liu, Zhuqing, 2023. "On the mechanisms of pressure drop and viscous losses in hydrofoil tip-clearance flows," Energy, Elsevier, vol. 269(C).
    16. Huang, Zhenwei & Huang, Zhenyou & Fan, Honggang, 2020. "Influence of C groove on energy performance and noise source of a NACA0009 hydrofoil with tip clearance," Renewable Energy, Elsevier, vol. 159(C), pages 726-735.

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