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Effect of hydrofoil flexibility on the power extraction of a flapping tidal generator via two- and three-dimensional flow simulations

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  • Le, Tuyen Quang
  • Ko, Jin Hwan

Abstract

In this study, we investigate the effect of hydrofoil flexibility on the power extraction of a flapping tidal stream generator with hydrofoils down-scaled for a water channel in an experiment with a typical Strouhal number and frequency. The described deformations in the chord and spanwise directions are imposed onto the surfaces of the hydrofoil to analyze the flexibility effect. In a two-dimensional (2D) simulation, parameter studies of the chordwise flexure are conducted and a 30% improvement in the rate of the power-extraction efficiency is then achieved when the chordwise flexure is 20% of the chord length. In a three-dimensional (3D) simulation, the chordwise flexure of 20% achieves a 15% improvement in the rate of the power-extraction efficiency for the hydrofoil with an aspect ratio (AR) of 5, which is less than that in the 2D simulation due to 3D effects such as tip loss and a spanwise vortex. Meanwhile, the effect of the spanwise flexure on the power extraction is minor as compared to that of the chordwise flexure. It was also found throughout the parametric study of the AR variation that the 3D effect of the chordwise flexible hydrofoil is slightly stronger than that of the rigid hydrofoil.

Suggested Citation

  • Le, Tuyen Quang & Ko, Jin Hwan, 2015. "Effect of hydrofoil flexibility on the power extraction of a flapping tidal generator via two- and three-dimensional flow simulations," Renewable Energy, Elsevier, vol. 80(C), pages 275-285.
    • Handle: RePEc:eee:renene:v:80:y:2015:i:c:p:275-285
    DOI: 10.1016/j.renene.2015.01.068
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    References listed on IDEAS

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    1. Khan, M.J. & Bhuyan, G. & Iqbal, M.T. & Quaicoe, J.E., 2009. "Hydrokinetic energy conversion systems and assessment of horizontal and vertical axis turbines for river and tidal applications: A technology status review," Applied Energy, Elsevier, vol. 86(10), pages 1823-1835, October.
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    Cited by:

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    2. Liu, Zhen & Qu, Hengliang, 2022. "Numerical study on a coupled-pitching flexible hydrofoil under the semi-passive mode," Renewable Energy, Elsevier, vol. 189(C), pages 339-358.
    3. Zhang, Yubing & Wang, Yong & Xie, Yudong & Sun, Guang & Han, Jiazhen, 2022. "Effects of flexibility on energy extraction performance of an oscillating hydrofoil under a semi-activated mode," Energy, Elsevier, vol. 242(C).
    4. Zhang, Yubing & Wang, Qixian & Han, Jiazhen & Xie, Yudong, 2023. "Effects of unsteady stream on hydrodynamic behavior of flexible hydrofoil in semi-passive mode," Renewable Energy, Elsevier, vol. 206(C), pages 451-465.
    5. Wang, Bo & Zhu, Bing & Zhang, Wei, 2019. "New type of motion trajectory for increasing the power extraction efficiency of flapping wing devices," Energy, Elsevier, vol. 189(C).
    6. 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.

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