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Hydrodynamic performance of a pile-restrained WEC-type floating breakwater: An experimental study

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  • Ning, Dezhi
  • Zhao, Xuanlie
  • Göteman, Malin
  • Kang, Haigui

Abstract

In this paper, a system which integrates an oscillating buoy type wave energy converter with a vertical pile-restrained floating breakwater is introduced. A preliminary experimental study on the hydrodynamic performance of the system is carried out in a wave flume under the action of regular waves. A current controller-magnetic powder brake system is used to simulate the power generation system. The design is verified against published results. The power-take off damping characteristics are investigated, and the current controller-magnetic powder brake system can simulate the (approximate) Coulomb damping force very well. The effects of various parameters, including wave period and wave height, dimensions of the system and excitation current, on the hydrodynamic performance are investigated. Results indicate that the power take-off damping force, draft and relative width between the floating breakwater and the wavelength have a significant influence on the hydrodynamic performance of the system. A range can be observed for which the capture width ratio of the system can achieve approximately 24% while transmission coefficient was kept lower than 0.50 with the proper adjustment of power take-off damping force, and the floating breakwater performs in an effective manner. The new concept provides a promising way to utilize wave energy cost-effectively.

Suggested Citation

  • Ning, Dezhi & Zhao, Xuanlie & Göteman, Malin & Kang, Haigui, 2016. "Hydrodynamic performance of a pile-restrained WEC-type floating breakwater: An experimental study," Renewable Energy, Elsevier, vol. 95(C), pages 531-541.
  • Handle: RePEc:eee:renene:v:95:y:2016:i:c:p:531-541
    DOI: 10.1016/j.renene.2016.04.057
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    References listed on IDEAS

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    1. Babarit, A. & Hals, J. & Muliawan, M.J. & Kurniawan, A. & Moan, T. & Krokstad, J., 2012. "Numerical benchmarking study of a selection of wave energy converters," Renewable Energy, Elsevier, vol. 41(C), pages 44-63.
    2. Orer, G. & Ozdamar, A., 2007. "An experimental study on the efficiency of the submerged plate wave energy converter," Renewable Energy, Elsevier, vol. 32(8), pages 1317-1327.
    3. He, Fang & Huang, Zhenhua & Law, Adrian Wing-Keung, 2013. "An experimental study of a floating breakwater with asymmetric pneumatic chambers for wave energy extraction," Applied Energy, Elsevier, vol. 106(C), pages 222-231.
    4. Henderson, Ross, 2006. "Design, simulation, and testing of a novel hydraulic power take-off system for the Pelamis wave energy converter," Renewable Energy, Elsevier, vol. 31(2), pages 271-283.
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