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Behaviors of two semi-passive oscillating hydrofoils with a tandem configuration

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  • Ma, Penglei
  • Wang, Yong
  • Xie, Yudong
  • Liu, Guijie

Abstract

Two hydrofoils with a tandem spatial configuration can share the same flow window. The wake vortex interaction and blockage effect have noticeable impacts on the response of two hydrofoils for a semi-passive system. In this study, the responses of two oscillating hydrofoils with a tandem arrangement are examined using a numerical approach. The results indicate that the downstream hydrofoil has an inferior energy harvesting performance because it operates in the upstream hydrofoil wake. Several special cases were observed. As a result of a negative interaction in the wake vortices, (i) two hydrofoils were shown to have different heaving equilibrium positions and thus no longer share the flow window; and (ii) the downstream hydrofoil was demonstrated to have a larger heaving amplitude but a lower energy harvesting performance. At a very high oscillation frequency, the downstream hydrofoil tends to incur an irregular response owing to the intense vortex formation and shedding, as well as a constant interaction of the wake vortices. The downstream hydrofoil achieves an unexpectedly better energy harvesting performance due to a favorable interaction of the wake vortices. However, the entire system can’t achieve high efficiency due to the poor energy harvesting performance of the upstream hydrofoil. When two semi-passive oscillating hydrofoils have a tandem configuration, negative wake vortex interactions should be avoided instead of seeking a favorable interaction.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:214:y:2021:i:c:s0360544220320156
    DOI: 10.1016/j.energy.2020.118908
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    References listed on IDEAS

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    1. 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).
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    5. Karbasian, H.R. & Esfahani, J.A. & Barati, E., 2015. "Simulation of power extraction from tidal currents by flapping foil hydrokinetic turbines in tandem formation," Renewable Energy, Elsevier, vol. 81(C), pages 816-824.
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