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Numerical investigation on energy extraction of flapping hydrofoils with different series foil shapes

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  • Wang, Ying
  • Sun, Xiaojing
  • Huang, Diangui
  • Zheng, Zhongquan

Abstract

As a new mode of energy extraction, flapping foils show broad application prospects. How to improve the energy extraction efficiency (η) of wind or hydro energy with flapping foils has become a focused issue for scientists in this field. This paper numerically investigated the energy extraction of flapping hydrofoil with different NACA 4 and NACA 6 series foil shapes. Firstly, compared with experimental results, the simulation results were validated. Secondly, by adopting different series of foil shapes, simulation was conducted for energy extraction of flapping foils which were moving harmonically in current: ① symmetric foils with different maximum thicknesses; ② symmetric foils with different maximum thickness positions; ③non-symmetric foils with same maximum thickness, maximum thickness position and camber, but different maximum camber positions; ④ non-symmetric foils with same maximum thickness, maximum thickness position and camber position, but different maximum cambers. It is found that for symmetric foils with different maximum thicknesses, η basically increases first and then decreases with the increase of maximum thickness; for symmetric foils with different maximum thickness positions, η first increases and then decreases when maximum thickness position moves from the leading edge to the trailing edge; for non-symmetric foils with same thickness, η shows lower value with larger camber; compared with maximum camber position, the maximum thickness shows larger influence on η.

Suggested Citation

  • Wang, Ying & Sun, Xiaojing & Huang, Diangui & Zheng, Zhongquan, 2016. "Numerical investigation on energy extraction of flapping hydrofoils with different series foil shapes," Energy, Elsevier, vol. 112(C), pages 1153-1168.
    • Handle: RePEc:eee:energy:v:112:y:2016:i:c:p:1153-1168
    DOI: 10.1016/j.energy.2016.06.092
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    References listed on IDEAS

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    Cited by:

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    7. Liu, Zhen & Qu, Hengliang & Shi, Hongda, 2020. "Energy-harvesting performance of a coupled-pitching hydrofoil under the semi-passive mode," Applied Energy, Elsevier, vol. 267(C).
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