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An Experimental Study of Pile-Supported OWC-Type Breakwaters: Energy Extraction and Vortex-Induced Energy Loss

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  • Fang He

    (Ocean College, Zhejiang University, Hangzhou 310058, China)

  • Mingjia Li

    (Ocean College, Zhejiang University, Hangzhou 310058, China)

  • Zhenhua Huang

    (Department of Ocean and Resources Engineering, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, HI 96822, USA)

Abstract

Integrating wave energy converters with breakwaters is a promising concept for wave energy utilization. On the basis of fulfilling the wave protection demands, pile-supported Oscillating Water Column (OWC)-type breakwaters can also meet the local needs of electricity far from the lands. In the present study, the wave energy extraction and vortex-induced energy loss of pile-supported OWC-type breakwaters were analyzed based on a two-point measurement method. The importance of energy extraction and vortex-induced energy loss on the wave energy dissipation of pile-supported OWC-type breakwaters were experimentally investigated. It was found that the trends of energy extraction and vortex-induced energy loss were generally correlated. The effects of the pneumatic damping induced by top opening affected the vortex-induced energy loss more than the energy extraction. Results showed that a larger pneumatic damping was preferable for the purpose of increasing energy extraction, whereas for a smaller pneumatic damping the vortex-induced energy loss was more important to the energy dissipation. With increasing draft, the energy extraction decreased, but the vortex-induced energy loss complementally contributed to the total energy dissipation and made the energy dissipation at the same level as that for a shallower draft.

Suggested Citation

  • Fang He & Mingjia Li & Zhenhua Huang, 2016. "An Experimental Study of Pile-Supported OWC-Type Breakwaters: Energy Extraction and Vortex-Induced Energy Loss," Energies, MDPI, vol. 9(7), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:7:p:540-:d:73856
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    References listed on IDEAS

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    Cited by:

    1. Huang, Shijie & Huang, Zhenhua, 2022. "Hydrodynamic performance of a row of closely-spaced bottom-sitting oscillating water columns," Renewable Energy, Elsevier, vol. 195(C), pages 344-356.
    2. Elhanafi, Ahmed & Kim, Chan Joo, 2018. "Experimental and numerical investigation on wave height and power take–off damping effects on the hydrodynamic performance of an offshore–stationary OWC wave energy converter," Renewable Energy, Elsevier, vol. 125(C), pages 518-528.
    3. Mia, Mohammad Rashed & Zhao, Ming & Wu, Helen & Munir, Adnan, 2022. "Numerical investigation of offshore oscillating water column devices," Renewable Energy, Elsevier, vol. 191(C), pages 380-393.
    4. Elhanafi, Ahmed & Fleming, Alan & Macfarlane, Gregor & Leong, Zhi, 2017. "Underwater geometrical impact on the hydrodynamic performance of an offshore oscillating water column–wave energy converter," Renewable Energy, Elsevier, vol. 105(C), pages 209-231.
    5. Luana Gurnari & Pasquale G. F. Filianoti & Marco Torresi & Sergio M. Camporeale, 2020. "The Wave-to-Wire Energy Conversion Process for a Fixed U-OWC Device," Energies, MDPI, vol. 13(1), pages 1-25, January.
    6. Simonetti, I. & Cappietti, L. & Oumeraci, H., 2018. "An empirical model as a supporting tool to optimize the main design parameters of a stationary oscillating water column wave energy converter," Applied Energy, Elsevier, vol. 231(C), pages 1205-1215.
    7. 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.
    8. Mia, Mohammad Rashed & Zhao, Ming & Wu, Helen & Munir, Adnan, 2021. "Numerical investigation of scaling effect in two-dimensional oscillating water column wave energy devices for harvesting wave energy," Renewable Energy, Elsevier, vol. 178(C), pages 1381-1397.
    9. Simonetti, I. & Cappietti, L. & Elsafti, H. & Oumeraci, H., 2017. "Optimization of the geometry and the turbine induced damping for fixed detached and asymmetric OWC devices: A numerical study," Energy, Elsevier, vol. 139(C), pages 1197-1209.

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