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Flow structures in wake of a pile-supported horizontal axis tidal stream turbine

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  • Zhang, Jisheng
  • Lin, Xiangfeng
  • Wang, Risheng
  • Guo, Yakun
  • Zhang, Can
  • Zhang, Yuquan

Abstract

This study presents results from laboratory experiments to investigate the wake structure in the lee side of a scaled three-bladed horizontal axis tidal stream turbine with a mono-pile support structure. Experiments are conducted for a range of approaching flow velocity and installation height of rotor. Analysis of the results shows that bed shear stress increases with the increase of approaching velocity and decrease of installation height within 2D (D is the diameter of the rotor) downstream of the rotor. The flow field within 2D downstream of the rotor is greatly influenced by the presence of nacelle and mono-pile. Low stream-wise flow velocity and large turbulence intensity level is detected along the flume center right behind the nacelle and mono-pile from 1D to 2D downstream of the rotor. Stream-wise velocity at the blade tip height lower than the nacelle increases sharply from 1D to 2D and gradually grows afterwards. Correspondingly, the turbulence intensity decreases quickly from 1D to 2D and slowly afterwards. Large bed shear stress is measured from 1D to 2D, which is closely related to turbulence induced by the mono-pile. It is also found that the presence of the mono-pile might make the flow field more ‘disc-shaped’.

Suggested Citation

  • Zhang, Jisheng & Lin, Xiangfeng & Wang, Risheng & Guo, Yakun & Zhang, Can & Zhang, Yuquan, 2020. "Flow structures in wake of a pile-supported horizontal axis tidal stream turbine," Renewable Energy, Elsevier, vol. 147(P1), pages 2321-2334.
    • Handle: RePEc:eee:renene:v:147:y:2020:i:p1:p:2321-2334
    DOI: 10.1016/j.renene.2019.10.017
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    References listed on IDEAS

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    2. Lin, Jie & Lin, Binliang & Sun, Jian & Chen, Yaling, 2021. "Wake structure and mechanical energy transformation induced by a horizontal axis tidal stream turbine," Renewable Energy, Elsevier, vol. 171(C), pages 1344-1356.
    3. Liu, Zhen & Qu, Hengliang & Song, Xinyu & Chen, Zhengshou & Ni, Heqiang, 2023. "Energy-harvesting performance of tandem coupled-pitching hydrofoils under the semi-activated mode: An experimental study," Energy, Elsevier, vol. 279(C).
    4. Can Zhang & Jisheng Zhang & Athanasios Angeloudis & Yudi Zhou & Stephan C. Kramer & Matthew D. Piggott, 2023. "Physical Modelling of Tidal Stream Turbine Wake Structures under Yaw Conditions," Energies, MDPI, vol. 16(4), pages 1-21, February.
    5. Zhang, Jisheng & Zhou, Yudi & Lin, Xiangfeng & Wang, Guohui & Guo, Yakun & Chen, Hao, 2022. "Experimental investigation on wake and thrust characteristics of a twin-rotor horizontal axis tidal stream turbine," Renewable Energy, Elsevier, vol. 195(C), pages 701-715.

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