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Wave power extraction by a nearshore oscillating water column converter with a surging lip-wall

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  • Deng, Zhengzhi
  • Wang, Lin
  • Zhao, Xizeng
  • Wang, Peng

Abstract

A near-shore oscillating water column (OWC) device with a surging front-wall, which can be conveniently mounted on various cliff-like shores or coastal structures, is proposed to improve the pneumatic efficiency of wave energy extraction. Based on linear potential theory, the interaction between ocean waves and the OWC device is solved by the matched eigenfunction expansion method (MEEM). Auxiliary functions, expanded in orthogonal polynomials, are introduced to approximate the singular behaviors of fluid field in the vicinity of the salient corner. The effects of the dimensions of lip-wall and the stiffness of the spring on the hydrodynamic performances, such as the response amplitude operator (RAO), average inside free-surface elevation, phase difference between the motions of lip-wall and inside free-surface, and optimum conversion efficiency are taken into consideration. The numerical results show that the existence of a freely surging lip-wall can considerably improve the performance of the device over a wider bandwidth, especially for the intermediate and short wavelength regimes, compared with the fixed one.

Suggested Citation

  • Deng, Zhengzhi & Wang, Lin & Zhao, Xizeng & Wang, Peng, 2020. "Wave power extraction by a nearshore oscillating water column converter with a surging lip-wall," Renewable Energy, Elsevier, vol. 146(C), pages 662-674.
    • Handle: RePEc:eee:renene:v:146:y:2020:i:c:p:662-674
    DOI: 10.1016/j.renene.2019.06.178
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    References listed on IDEAS

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    Cited by:

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    3. Zhao, Xuanlie & Zhang, Yang & Li, Mingwei & Johanning, Lars, 2021. "Experimental and analytical investigation on hydrodynamic performance of the comb-type breakwater-wave energy converter system with a flange," Renewable Energy, Elsevier, vol. 172(C), pages 392-407.
    4. Samak, Mahmoud M. & Elgamal, Hassan & Nagib Elmekawy, Ahmed M., 2021. "The contribution of L-shaped front wall in the improvement of the oscillating water column wave energy converter performance," Energy, Elsevier, vol. 226(C).
    5. Guo, Baoming & Ning, Dezhi & Wang, Rongquan & Ding, Boyin, 2021. "Hydrodynamics of an oscillating water column WEC - Breakwater integrated system with a pitching front-wall," Renewable Energy, Elsevier, vol. 176(C), pages 67-80.
    6. Xu, Conghao & He, Yuanyuan & Yao, Yu & Zuo, Jun, 2023. "Experimental and numerical study of a circular OWC with a U-shaped duct for wave energy conversion in long waves: Hydrodynamic characteristics and viscous energy loss," Renewable Energy, Elsevier, vol. 215(C).
    7. Wang, Chen & Zhang, Yongliang & Deng, Zhengzhi, 2021. "Theoretical analysis on hydrodynamic performance for a dual-chamber oscillating water column device with a pitching front lip-wall," Energy, Elsevier, vol. 226(C).
    8. Wang, Yuhan & Wang, Dongxu & Dong, Sheng, 2022. "A theoretical model for an integrated wave energy extraction system consisting of a heaving buoy and a perforated wall," Renewable Energy, Elsevier, vol. 189(C), pages 1086-1101.
    9. Wang, Chen & Zhang, Yongliang & Deng, Zhengzhi, 2022. "Hydrodynamic performance of a heaving oscillating water column device restrained by a spring-damper system," Renewable Energy, Elsevier, vol. 187(C), pages 331-346.
    10. 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.
    11. Shao, Zhuxiao & Gao, Huijun & Liang, Bingchen & Lee, Dongyoung, 2022. "Potential, trend and economic assessments of global wave power," Renewable Energy, Elsevier, vol. 195(C), pages 1087-1102.
    12. Dimitrios N. Konispoliatis, 2023. "The Effect of Hydrodynamics on the Power Efficiency of a Toroidal Oscillating Water Column Device," Sustainability, MDPI, vol. 15(16), pages 1-29, August.

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