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<p>This study presents a graded multi-chamber oscillating water column (OWC) wave energy device designed to enhance broadband wave energy extraction. An experimental campaign was conducted to characterize the free decay behavior and natural frequencies of the multi-chamber OWC system, and to investigate its energy capture performance, reflection, and transmission characteristics under various operating conditions. From free decay tests, the natural frequencies of the water columns were determined, and these corresponded to the peak efficiency locations of their respective sub-chambers. The differences in natural frequencies among individual chambers contribute to an extended energy capture bandwidth in the graded multi-chamber OWC device, offering insights for broadband wave energy converter design. Moreover, the system achieved a maximum hydrodynamic efficiency of 89.84% within the tested range. By optimizing the opening ratios, a cumulative hydrodynamic efficiency exceeding 60% was achieved across the tested frequency range. Appropriate adjustment of the opening ratios also enabled effective wave absorption for longer-period waves.</p>

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Experimental Study on the Hydrodynamic Performance of a Graded Multi-Chamber Oscillating Water Column (OWC) Wave Energy Device

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Li-dong Zhang,
  • Jin-fang Hou,
  • Yao Zhou,
  • Jing Geng,
  • Xuan-lie Zhao

摘要

This study presents a graded multi-chamber oscillating water column (OWC) wave energy device designed to enhance broadband wave energy extraction. An experimental campaign was conducted to characterize the free decay behavior and natural frequencies of the multi-chamber OWC system, and to investigate its energy capture performance, reflection, and transmission characteristics under various operating conditions. From free decay tests, the natural frequencies of the water columns were determined, and these corresponded to the peak efficiency locations of their respective sub-chambers. The differences in natural frequencies among individual chambers contribute to an extended energy capture bandwidth in the graded multi-chamber OWC device, offering insights for broadband wave energy converter design. Moreover, the system achieved a maximum hydrodynamic efficiency of 89.84% within the tested range. By optimizing the opening ratios, a cumulative hydrodynamic efficiency exceeding 60% was achieved across the tested frequency range. Appropriate adjustment of the opening ratios also enabled effective wave absorption for longer-period waves.