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Unsteady aerodynamics of the floating offshore wind turbine due to the trailing vortex induction and airfoil dynamic stall

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  • Zhou, Le
  • Shen, Xin
  • Ma, Lu
  • Chen, Jiajia
  • Ouyang, Hua
  • Du, Zhaohui

Abstract

The trailing vortex induction effect and the airfoil dynamic stall are two main sources of the wind turbine unsteady aerodynamics. The unsteady aerodynamics of the floating offshore wind turbine (FOWT) is more complicated than its monopile counterpart due to the existence of the additional six degrees of freedom motion (6-DOF) of the floating platform. This paper focuses on the unsteady aerodynamics of the FOWT under surge condition results from the trailing vortex induction and airfoil dynamic stall, especially the resulting hysteresis effect, by adopting the free vortex wake (FVW) method coupled with the dynamic stall model. The reasons and manifestations of the hysteresis effect are discussed, and the effect of the operation conditions on the hysteresis effect of the FOWT are analyzed. Besides, other unsteady aerodynamic phenomena associated with the hysteresis effect are also included. Results show that, when the FOWT operates under surge condition, there exists a phase lag between the loads response and the variation of the rotor inflow velocity, which is a manifestation of the hysteresis effect. With the variation of the operation conditions of the FOWT, the phenomena such as dynamic stall, blade-wake interaction and the transition of the operation state may occur, and the manifestation of the hysteresis effect will be different.

Suggested Citation

  • Zhou, Le & Shen, Xin & Ma, Lu & Chen, Jiajia & Ouyang, Hua & Du, Zhaohui, 2024. "Unsteady aerodynamics of the floating offshore wind turbine due to the trailing vortex induction and airfoil dynamic stall," Energy, Elsevier, vol. 304(C).
    • Handle: RePEc:eee:energy:v:304:y:2024:i:c:s0360544224016189
    DOI: 10.1016/j.energy.2024.131845
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    References listed on IDEAS

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    6. Arabgolarcheh, Alireza & Micallef, Daniel, 2026. "Low frequency surge motion and inter-spacing distances between turbines in offshore wind farms," Renewable Energy, Elsevier, vol. 256(PG).
    7. Zhou, Le & Shen, Xin & Ma, Lu & Ouyang, Hua & Du, Zhaohui, 2025. "Unsteady aeroelastic performance of the 15 MW floating offshore wind turbine under surge condition," Energy, Elsevier, vol. 336(C).

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