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An in-depth experimental investigation of power take-off damping effect on an offshore dual-chamber oscillating water column converter

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  • Pan, Jiapeng
  • Lin, Yuan
  • Weng, Junkang
  • Zheng, Siming
  • Wei, Maoxing
  • He, Fang

Abstract

Dual-chamber oscillating water column (OWC) converters can offer high-efficiency and broadband wave-energy conversion; however, they are still in their infancy due to the complexity of the hydrodynamic response with the entire system. Herein, the wave-energy conversion performance of a novel offshore dual-chamber OWC converter was investigated through wave flume experiments, focusing on the effect of power take-off (PTO) damping on each OWC unit as well as the whole performance. In addition, the mechanism of hydrodynamic interaction between two OWC units was investigated under various PTO damping combinations. Results demonstrate that this novel configuration effectively enhanced the wave-energy conversion performance of the rear OWC unit. A weaker fore PTO damping triggered a stronger rear chamber wave-energy conversion by boosting the wave transmission; in contrast, a stronger PTO damping of the rear OWC unit considerably enhanced the fore wave-energy conversion due to its modulation of the wave reflection from the rear OWC unit. The proposed dual-chamber OWC converter can effectively convert wave energy in a wide frequency bandwidth with the optimized PTO damping combination. Except under the shortest wave in the study, all overall capture width ratios exceeded 0.400 with a peak value of 0.581.

Suggested Citation

  • Pan, Jiapeng & Lin, Yuan & Weng, Junkang & Zheng, Siming & Wei, Maoxing & He, Fang, 2025. "An in-depth experimental investigation of power take-off damping effect on an offshore dual-chamber oscillating water column converter," Energy, Elsevier, vol. 322(C).
    • Handle: RePEc:eee:energy:v:322:y:2025:i:c:s0360544225012617
    DOI: 10.1016/j.energy.2025.135619
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    References listed on IDEAS

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