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Experimental Study of a Moored Floating Oscillating Water Column Wave-Energy Converter and of a Moored Cubic Box

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Listed:
  • Minghao Wu

    (Department of Civil Engineering, Ghent University, Technologiepark 60, B-9052 Zwijnaarde, Belgium)

  • Vasiliki Stratigaki

    (Department of Civil Engineering, Ghent University, Technologiepark 60, B-9052 Zwijnaarde, Belgium)

  • Peter Troch

    (Department of Civil Engineering, Ghent University, Technologiepark 60, B-9052 Zwijnaarde, Belgium)

  • Corrado Altomare

    (Department of Civil Engineering, Ghent University, Technologiepark 60, B-9052 Zwijnaarde, Belgium)

  • Tim Verbrugghe

    (Department of Civil Engineering, Ghent University, Technologiepark 60, B-9052 Zwijnaarde, Belgium)

  • Alejandro Crespo

    (Environmental Physics Laboratory, Universidade de Vigo, 36310 Pontevedra, Vigo, Spain)

  • Lorenzo Cappietti

    (Department of Civil Engineering, Università degli Studi di Firenze - UniFI, Via di Santa Marta 3, 50139 Florence, Italy)

  • Matthew Hall

    (School of Sustainable Design Engineering, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada)

  • Moncho Gómez-Gesteira

    (Environmental Physics Laboratory, Universidade de Vigo, 36310 Pontevedra, Vigo, Spain)

Abstract

This paper describes experimental research on a floating moored Oscillating Water Column (OWC)-type Wave-Energy Converter (WEC) carried out in the wave flume of the Coastal Engineering Research Group of Ghent University. This research has been introduced to cover the existing data scarcity and knowledge gaps regarding response of moored floating OWC WECs. The obtained data will be available in the future for the validation of nonlinear numerical models. The experiment focuses on the assessment of the nonlinear motion and mooring-line response of a 1:25 floating moored OWC WEC model to regular waves. The OWC WEC model motion has 6 degrees of freedom and is limited by a symmetrical 4-point mooring system. The model is composed of a chamber with an orifice on top of it to simulate the power-take-off (PTO) system and the associated damping of the motion of the OWC WEC model. In the first place, the motion response in waves of the moored floating OWC WEC model is investigated and the water surface elevation in the OWC WEC chamber is measured. Secondly, two different mooring-line materials (iron chains and nylon ropes) are tested and the corresponding OWC WEC model motions and mooring-line tensions are measured. The performance of these two materials is similar in small-amplitude waves but different in large wave-amplitude conditions. Thirdly, the influence of different PTO conditions is investigated by varying the diameter of the top orifice of the OWC WEC model. The results show that the PTO damping does not affect the OWC WEC motion but has an impact on the water surface elevation inside the OWC chamber. In addition, an unbalanced mooring configuration is discussed. Finally, the obtained data for a moored cubic model in waves are presented, which is a benchmarking case for future validation purposes.

Suggested Citation

  • Minghao Wu & Vasiliki Stratigaki & Peter Troch & Corrado Altomare & Tim Verbrugghe & Alejandro Crespo & Lorenzo Cappietti & Matthew Hall & Moncho Gómez-Gesteira, 2019. "Experimental Study of a Moored Floating Oscillating Water Column Wave-Energy Converter and of a Moored Cubic Box," Energies, MDPI, vol. 12(10), pages 1-20, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:10:p:1834-:d:231184
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    References listed on IDEAS

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    6. Elhanafi, Ahmed & Macfarlane, Gregor & Fleming, Alan & Leong, Zhi, 2017. "Experimental and numerical investigations on the hydrodynamic performance of a floating–moored oscillating water column wave energy converter," Applied Energy, Elsevier, vol. 205(C), pages 369-390.
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    1. Oikonomou, Charikleia L.G. & Gomes, Rui P.F. & Gato, Luís M.C., 2021. "Unveiling the potential of using a spar-buoy oscillating-water-column wave energy converter for low-power stand-alone applications," Applied Energy, Elsevier, vol. 292(C).
    2. Portillo, J.C.C. & Collins, K.M. & Gomes, R.P.F. & Henriques, J.C.C. & Gato, L.M.C. & Howey, B.D. & Hann, M.R. & Greaves, D.M. & Falcão, A.F.O., 2020. "Wave energy converter physical model design and testing: The case of floating oscillating-water-columns," Applied Energy, Elsevier, vol. 278(C).
    3. Gubesch, Eric & Abdussamie, Nagi & Penesis, Irene & Chin, Christopher, 2022. "Effects of mooring configurations on the hydrodynamic performance of a floating offshore oscillating water column wave energy converter," Renewable and Sustainable Energy Reviews, Elsevier, vol. 166(C).
    4. Jiayan Zhou & Huijuan Guo & Yuan Zheng & Zhi Zhang & Cong Yuan & Bin Liu, 2023. "Research on Wake Field Characteristics and Support Structure Interference of Horizontal Axis Tidal Stream Turbine," Energies, MDPI, vol. 16(9), pages 1-16, May.

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