Experimental study on the combined effects of geometric asymmetry and partial reflection wall on the power performance of a wave energy converter

Qi Zhang, Xiaozhong Li, Chusen Lin, Peng Jin, Qi He, Nan Hu and Binzhen Zhou

Energy, 2025, vol. 329, issue C

Abstract: The power performance of a heaving body wave energy converter (HBWEC) can be improved by increasing its degree of asymmetry (DoA) or deploying it in front of a seawall or a breakwater, simplified as a partial reflection wall. However, the combined effects of the reflection coefficient of the wall, the DoA of the device, and the clearance between the wall and the device are unclear. This research investigates these effects experimentally. Results show that the power performance of HBWEC follows the law of standing wave. A greater reflection coefficient could increase the energy conversion efficiency in the wave spectrum around the heaving natural period of the device. The power performance of an asymmetric HBWEC is better than that of a symmetric one. However, the improvement of power performance by the wall is more pronounced in symmetric devices than in asymmetric devices. Besides, the sloshing phenomenon of the intermediate water in the clearance is observed, which could weaken the power performance. In practice, a comprehensive consideration of DoA, reflection coefficient, and clearance is needed instead of merely seeking a higher DoA and reflection coefficient.

Keywords: Heaving body wave energy converter; Partial reflection wall; Power performance; Asymmetric device (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:329:y:2025:i:c:s0360544225024144

DOI: 10.1016/j.energy.2025.136772

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