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Experimental Study on Influence of Pitch Motion on the Wake of a Floating Wind Turbine Model

Author

Listed:
  • Stanislav Rockel

    (ForWind, University of Oldenburg, Ammerländer Heerstr. 136, 26129 Oldenburg, Germany)

  • Elizabeth Camp

    (Department of Mechanical and Materials Engineering, Portland State University, P.O. Box 751,Portland, OR 97207, USA)

  • Jonas Schmidt

    (Fraunhofer IWES, Ammerländer Heerstr. 136, 26129 Oldenburg, Germany)

  • Joachim Peinke

    (ForWind, University of Oldenburg, Ammerländer Heerstr. 136, 26129 Oldenburg, Germany)

  • Raúl Bayoán Cal

    (Department of Mechanical and Materials Engineering, Portland State University, P.O. Box 751,Portland, OR 97207, USA)

  • Michael Hölling

    (ForWind, University of Oldenburg, Ammerländer Heerstr. 136, 26129 Oldenburg, Germany)

Abstract

Wind tunnel experiments were performed, where the development of the wake of a model wind turbine was measured using stereo Particle Image Velocimetry to observe the influence of platform pitch motion. The wakes of a classical bottom fixed turbine and a streamwise oscillating turbine are compared. Results indicate that platform pitch creates an upward shift in all components of the flow and their fluctuations. The vertical flow created by the pitch motion as well as the reduced entrainment of kinetic energy from undisturbed flows above the turbine result in potentially higher loads and less available kinetic energy for a downwind turbine. Experimental results are compared with four wake models. The wake models employed are consistent with experimental results in describing the shapes and magnitudes of the streamwise velocity component of the wake for a fixed turbine. Inconsistencies between the model predictions and experimental results arise in the floating case particularly regarding the vertical displacement of the velocity components of the flow. Furthermore, it is found that the additional degrees of freedom of a floating wind turbine add to the complexity of the wake aerodynamics and improved wake models are needed, considering vertical flows and displacements due to pitch motion.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:7:y:2014:i:4:p:1954-1985:d:34492
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    References listed on IDEAS

    as
    1. Sebastian, T. & Lackner, M.A., 2012. "Development of a free vortex wake method code for offshore floating wind turbines," Renewable Energy, Elsevier, vol. 46(C), pages 269-275.
    2. Thomas Sebastian & Matthew Lackner, 2012. "Analysis of the Induction and Wake Evolution of an Offshore Floating Wind Turbine," Energies, MDPI, vol. 5(4), pages 1-33, April.
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