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Performance Studies on a Scaled Model of Dual Oscillating-Buoys WEC with One Pneumatic PTO

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  • Peiyu Liu

    (School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
    Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China)

  • Xiang Rao

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    College of Energy Science and Technology, University of Science and Technology of China, Hefei 230026, China)

  • Bijun Wu

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    College of Energy Science and Technology, University of Science and Technology of China, Hefei 230026, China)

  • Zhiwen Yuan

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    College of Energy Science and Technology, University of Science and Technology of China, Hefei 230026, China)

  • Fuming Zhang

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China)

Abstract

A hybrid wave energy conversion (WEC) system, integrating a backward bent duct buoy (BBDB) with an oscillating buoy (OB) via a flexible mooring chain, is introduced in this study. Unlike existing hybrid WECs, the proposed system dispenses with rigid mechanical linkages and enables flexible offshore deployment. Flared BBDB and buoy models with spherical, cylindrical, and semi-capsule shapes are designed and tested experimentally in a wave flume using both regular and irregular wave conditions. The effects of nozzle ratio (NR), coupling distance, buoy draft, and buoy geometry are systematically examined to investigate the hydrodynamic performance and energy conversion characteristics. It is found that NR at 110 under unidirectional airflow produces an optimal balance between pressure response, free surface displacement, and energy conversion efficiency. Energy extraction is significantly influenced by the coupling distance, with the hybrid system achieving maximum performance at a specific normalized spacing. The semi-capsule buoy improves power extraction ability and expands effective bandwidth due to asymmetric shape and coupled motion. These findings provide valuable insights into the coupling mechanism and geometric optimization for hybrid WECs.

Suggested Citation

  • Peiyu Liu & Xiang Rao & Bijun Wu & Zhiwen Yuan & Fuming Zhang, 2025. "Performance Studies on a Scaled Model of Dual Oscillating-Buoys WEC with One Pneumatic PTO," Energies, MDPI, vol. 18(15), pages 1-21, August.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:15:p:4151-:d:1717981
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