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Experimental investigation on wake and thrust characteristics of a twin-rotor horizontal axis tidal stream turbine

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  • Zhang, Jisheng
  • Zhou, Yudi
  • Lin, Xiangfeng
  • Wang, Guohui
  • Guo, Yakun
  • Chen, Hao

Abstract

Study on the performance of the tidal stream turbines could greatly improve tidal stream energy development. Up to date, few studies about the twin-rotor horizontal axis tidal turbines (TRHATTs) are available. In this study, laboratory experiments with a range of approaching flow velocity and yaw angles are conducted to investigate the wake structures in the lee side of the turbine. The experimental results show that there are three ‘rod-liked’ wakes behind the turbine, which merge into one wake further downstream. Increase of the approaching flow velocity can accelerate wake velocity recovery and enhances turbulence intensity. Correspondingly, the thrust and the fluctuation of thrust also increase. When the turbine is subjected to the yawed inflow, one side of the near wake mixing accelerates and the turbulence intensity distribution becomes asymmetric. The study shows that the thrust is slightly reduced with an increase of the yaw angle, and reaches the maximum when the yaw angle is 40°. Fluctuation range of the thrust increases with the increase of the yaw angle, and starts to decrease when the yaw angle exceeds 30°.

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  • 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.
    • Handle: RePEc:eee:renene:v:195:y:2022:i:c:p:701-715
    DOI: 10.1016/j.renene.2022.05.061
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    References listed on IDEAS

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    Cited by:

    1. Chen, Yaling & Lin, Binliang & Liang, Dongfang, 2023. "Interactions between approaching flow and hydrokinetic turbines in a staggered layout," Renewable Energy, Elsevier, vol. 218(C).
    2. Deng, Xu & Zhang, Jisheng & Lin, Xiangfeng, 2024. "Proposal of actuator line-immersed boundary coupling model for tidal stream turbine modeling with hydrodynamics upon scouring morphology," Energy, Elsevier, vol. 292(C).
    3. Dong, Yongjun & Yan, Yuting & Xu, Shiming & Zhang, Xinyu & Zhang, Xiao & Chen, Jianmei & Guo, Jingfu, 2023. "An adaptive yaw method of horizontal-axis tidal stream turbines for bidirectional energy capture," Energy, Elsevier, vol. 282(C).

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