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Dynamic wake development of a floating wind turbine in free pitch motion subjected to turbulent inflow generated with an active grid

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  • Rockel, Stanislav
  • Peinke, Joachim
  • Hölling, Michael
  • Cal, Raúl Bayoán

Abstract

Development of wake turbulence of a floating wind turbine model under low and high turbulence inflow was investigated in comparison to the wake of a bottom fixed turbine. In wind tunnel experiments, two inflow conditions were generated using an active grid and the wakes of the model wind turbines were measured using a rake of 16 hot-wires, at downstream positions from one to seven rotor diameters. The flow was analyzed using statistical, spectral and spatial analysis. Under low turbulence inflow, the turbine type has highest impact on the wake, where structures created at the blade tips define substantially characteristics of the wake. Formation of a correlated tip and root vortices, that is found for the fixed turbine, is inhibited by the floating turbine. Under high turbulence inflow, the turbine type plays a subordinated role. Tip vortices are destabilized by large structures created with the active grid, that persist in the wake. Further analysis using proper orthogonal decomposition reveals more complex pattern under high turbulent inflow, that contain high percentage of turbulent kinetic energy, when compared to the low turbulent inflow, where the wake is composed by local point-wise contributions to the turbulent kinetic energy.

Suggested Citation

  • Rockel, Stanislav & Peinke, Joachim & Hölling, Michael & Cal, Raúl Bayoán, 2017. "Dynamic wake development of a floating wind turbine in free pitch motion subjected to turbulent inflow generated with an active grid," Renewable Energy, Elsevier, vol. 112(C), pages 1-16.
    • Handle: RePEc:eee:renene:v:112:y:2017:i:c:p:1-16
    DOI: 10.1016/j.renene.2017.05.016
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    References listed on IDEAS

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    1. David Bastine & Björn Witha & Matthias Wächter & Joachim Peinke, 2015. "Towards a Simplified DynamicWake Model Using POD Analysis," Energies, MDPI, vol. 8(2), pages 1-26, January.
    2. Stanislav Rockel & Elizabeth Camp & Jonas Schmidt & Joachim Peinke & Raúl Bayoán Cal & Michael Hölling, 2014. "Experimental Study on Influence of Pitch Motion on the Wake of a Floating Wind Turbine Model," Energies, MDPI, vol. 7(4), pages 1-32, March.
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    Cited by:

    1. Li, L. & Hearst, R.J. & Ferreira, M.A. & Ganapathisubramani, B., 2020. "The near-field of a lab-scale wind turbine in tailored turbulent shear flows," Renewable Energy, Elsevier, vol. 149(C), pages 735-748.
    2. Zheng, Yidan & Liu, Huiwen & Chamorro, Leonardo P. & Zhao, Zhenzhou & Li, Ye & Zheng, Yuan & Tang, Kexin, 2023. "Impact of turbulence level on intermittent-like events in the wake of a model wind turbine," Renewable Energy, Elsevier, vol. 203(C), pages 45-55.
    3. Sadek, Zein & Scott, Ryan & Hamilton, Nicholas & Cal, Raúl Bayoán, 2023. "A three-dimensional, analytical wind turbine wake model: Flow acceleration, empirical correlations, and continuity," Renewable Energy, Elsevier, vol. 209(C), pages 298-309.
    4. Duan, Lei & Sun, Qinghong & He, Zanyang & Li, Gen, 2022. "Wake topology and energy recovery in floating horizontal-axis wind turbines with harmonic surge motion," Energy, Elsevier, vol. 260(C).
    5. Kaldellis, John K. & Triantafyllou, Panagiotis & Stinis, Panagiotis, 2021. "Critical evaluation of Wind Turbines’ analytical wake models," Renewable and Sustainable Energy Reviews, Elsevier, vol. 144(C).

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