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Performance evaluation and enhancement of a semi-activated flapping hydrofoil in shear flows

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  • Liu, Zhen
  • Qu, Hengliang
  • Shi, Hongda

Abstract

The semi-activated flapping hydrofoil is a promising device for harvesting tidal stream energy in shallow water with a relatively higher efficiency. A two-dimensional numerical model, based on the computational fluid dynamics software ANSYS-Fluent, was established and validated to investigate a semi-activated hydrofoil with activated pitching and induced heaving motions in the shear flows. It was found that the hydrofoil can reach a stable stage to passively heave about an equilibrium point at various shear rates. Since the hydrofoil is pushed toward the low-velocity areas, its energy-harvesting efficiencies whether or not considering the hydrodynamic torques are lower than that in the uniform flow. Two controlling strategies were used to specifically restrict the downward motion ranges, namely a stop block or a linear spring, which demonstrated the ability to significantly increase the two efficiencies under various controlling parameters. The highest efficiencies of 0.50 and 0.52 were achieved using a linear spring at the shear rate of 2.0.

Suggested Citation

  • Liu, Zhen & Qu, Hengliang & Shi, Hongda, 2019. "Performance evaluation and enhancement of a semi-activated flapping hydrofoil in shear flows," Energy, Elsevier, vol. 189(C).
    • Handle: RePEc:eee:energy:v:189:y:2019:i:c:s0360544219319504
    DOI: 10.1016/j.energy.2019.116255
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    References listed on IDEAS

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    1. Teng, Lubao & Deng, Jian & Pan, Dingyi & Shao, Xueming, 2016. "Effects of non-sinusoidal pitching motion on energy extraction performance of a semi-active flapping foil," Renewable Energy, Elsevier, vol. 85(C), pages 810-818.
    2. Kinsey, T. & Dumas, G. & Lalande, G. & Ruel, J. & Méhut, A. & Viarouge, P. & Lemay, J. & Jean, Y., 2011. "Prototype testing of a hydrokinetic turbine based on oscillating hydrofoils," Renewable Energy, Elsevier, vol. 36(6), pages 1710-1718.
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    Cited by:

    1. Ma, Penglei & Liu, Guijie & Wang, Honghui & Wang, Yong & Xie, Yudong, 2021. "Co-simulations of a semi-passive oscillating foil turbine using a hydraulic system," Energy, Elsevier, vol. 217(C).
    2. 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).
    3. Liu, Zhen & Qu, Hengliang & Zhang, Guoliang, 2020. "Experimental and numerical investigations of a coupled-pitching hydrofoil under the fully-activated mode," Renewable Energy, Elsevier, vol. 155(C), pages 432-446.
    4. Ma, Penglei & Wang, Yong & Xie, Yudong & Liu, Guijie, 2021. "Behaviors of two semi-passive oscillating hydrofoils with a tandem configuration," Energy, Elsevier, vol. 214(C).
    5. 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.

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