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Wave power extraction of flap-type wave energy converter array mounted at the stepped bottom topography

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  • Zhang, Yang
  • Zhu, Wenjin
  • Cheng, Xiaofei

Abstract

This paper presents the development of a semi-analytical model to examine the hydrodynamic behavior of a periodic array of flap-type wave energy converters (WECs) installed on the stepped bottom topography, based on the linear potential flow theory. The mathematical model was validated using the energy flux conservation law, the Haskind's relation, and comparing it with the results of the existing literature. The effects of wave and geometrical parameters were revealed. The theoretical results indicate that hydrodynamic efficiency is enhanced due to the quarter wavelength resonance above stepped bottom topography. The occurrence of Rayleigh-Bloch waves on the windward and lee side of the device array is governed by distinct trigger conditions, resulting in more orders of propagating mode waves. A decline in hydrodynamic efficiency is observed beyond the critical wavenumber, accompanied by Rayleigh-Bloch waves. The findings contribute to the preliminary design of the flap-type WEC array in the coastal area.

Suggested Citation

  • Zhang, Yang & Zhu, Wenjin & Cheng, Xiaofei, 2023. "Wave power extraction of flap-type wave energy converter array mounted at the stepped bottom topography," Renewable Energy, Elsevier, vol. 218(C).
    • Handle: RePEc:eee:renene:v:218:y:2023:i:c:s0960148123012491
    DOI: 10.1016/j.renene.2023.119334
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    References listed on IDEAS

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