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Experimental and numerical comparisons of hydrodynamic responses for a combined wind and wave energy converter concept under operational conditions

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  • Wan, Ling
  • Gao, Zhen
  • Moan, Torgeir
  • Lugni, Claudio

Abstract

The spar torus combination (STC) concept is a combined wind and wave energy converter concept that is composed of a spar floating wind turbine and a torus-shaped, heaving-body wave energy converter (WEC). The WEC is installed on the spar floater. Wave power can be absorbed by a power-take off (PTO) system through the relative heave motions between spar and torus. Numerical model was established to predict dynamic responses of the STC concept ​under different sea states. To validate the numerical model, a model test of the STC concept under operational conditions was performed. A two-body physical model at a 1:50 scaling ratio was built. A series of tests were performed to assess the performance of the concept. During the tests, different PTO damping levels were applied. When large power output was achieved, air compressibility of the PTO damper in the model matters, making relevant a suitable nonlinear PTO modeling in the numerical simulations. Wind conditions were considered to model the effect of the thrust force on the rotor using a wind drag disc. Numerical and experimental results are presented and compared. Good agreements are achieved.

Suggested Citation

  • Wan, Ling & Gao, Zhen & Moan, Torgeir & Lugni, Claudio, 2016. "Experimental and numerical comparisons of hydrodynamic responses for a combined wind and wave energy converter concept under operational conditions," Renewable Energy, Elsevier, vol. 93(C), pages 87-100.
    • Handle: RePEc:eee:renene:v:93:y:2016:i:c:p:87-100
    DOI: 10.1016/j.renene.2016.01.087
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    References listed on IDEAS

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    1. Muliawan, Made Jaya & Karimirad, Madjid & Moan, Torgeir, 2013. "Dynamic response and power performance of a combined Spar-type floating wind turbine and coaxial floating wave energy converter," Renewable Energy, Elsevier, vol. 50(C), pages 47-57.
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