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Propeller and vortex ring state for floating offshore wind turbines during surge

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  • Kyle, Ryan
  • Lee, Yeaw Chu
  • Früh, Wolf-Gerrit

Abstract

Surge motion of a floating wind turbine can lead to conditions where the rotor moves backwards faster than the wind, leading to propeller-like conditions or vortex ring state (VRS). The effect of surge on the thrust of a floating turbine was investigated with OpenFOAM for conditions favourable to propeller and vortex ring state. Due to lower blade velocities and larger blade twists, a region of negative thrust is shown to extend spanwise from the blade root towards the tip signifying propeller state. Predictions that strong waves with low/moderate wind speeds leads to propeller-like conditions were confirmed for a representative surging simulation with a 9.4 m amplitude in waves with an 8.1 s period and 7 m/s wind speed. A negative thrust for the entire rotor, through the combination of an inboard region of negative and outboard region of small but still positive thrust, was observed during the expected part of the surging cycle. VRS was observed with blade tip-vortex interaction and root vortex recirculation due to the duration with a negative relative rotor velocity being similar to the blade passing period, inhibiting vortex advection downstream. This work explains and demonstrates the causes of propeller state and VRS for floating turbines.

Suggested Citation

  • Kyle, Ryan & Lee, Yeaw Chu & Früh, Wolf-Gerrit, 2020. "Propeller and vortex ring state for floating offshore wind turbines during surge," Renewable Energy, Elsevier, vol. 155(C), pages 645-657.
    • Handle: RePEc:eee:renene:v:155:y:2020:i:c:p:645-657
    DOI: 10.1016/j.renene.2020.03.105
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    References listed on IDEAS

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    Cited by:

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    3. Dong, Jing & Viré, Axelle & Li, Zhangrui, 2022. "Analysis the vortex ring state and propeller state of floating offshore wind turbines and verification of their prediction criteria by comparing with a CFD model," Renewable Energy, Elsevier, vol. 184(C), pages 15-25.
    4. Dong, Jing & Viré, Axelle, 2022. "The aerodynamics of floating offshore wind turbines in different working states during surge motion," Renewable Energy, Elsevier, vol. 195(C), pages 1125-1136.
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    7. Micallef, Daniel & Rezaeiha, Abdolrahim, 2021. "Floating offshore wind turbine aerodynamics: Trends and future challenges," Renewable and Sustainable Energy Reviews, Elsevier, vol. 152(C).
    8. Rezaeiha, Abdolrahim & Micallef, Daniel, 2021. "Wake interactions of two tandem floating offshore wind turbines: CFD analysis using actuator disc model," Renewable Energy, Elsevier, vol. 179(C), pages 859-876.
    9. Kyle, Ryan & Früh, Wolf-Gerrit, 2022. "The transitional states of a floating wind turbine during high levels of surge," Renewable Energy, Elsevier, vol. 200(C), pages 1469-1489.
    10. Subbulakshmi, A. & Verma, Mohit & Keerthana, M. & Sasmal, Saptarshi & Harikrishna, P. & Kapuria, Santosh, 2022. "Recent advances in experimental and numerical methods for dynamic analysis of floating offshore wind turbines — An integrated review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 164(C).
    11. Cai, Yefeng & Zhao, Haisheng & Li, Xin & Liu, Yuanchuan, 2023. "Effects of yawed inflow and blade-tower interaction on the aerodynamic and wake characteristics of a horizontal-axis wind turbine," Energy, Elsevier, vol. 264(C).

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