Enhancing power conversion via wave-guiding walls for an oscillating water column device integrated into a straight coast: Normal and oblique wave incidence

Chen Wang, Yongliang Zhang, Haochun Xu, Peng Guo and Huanbin Yang

Renewable and Sustainable Energy Reviews, 2025, vol. 216, issue C

Abstract: Optimizing the utilization and design of marine infrastructure is pivotal for the innovative advancement and integration of the marine engineering sector, particularly in wave energy generation. This study investigated a cylindrical oscillating water column (OWC) device employing a U-shaped flow channel impulse turbine, integrated into a straight coast with wave-guiding walls functioning as wave-focusing structures. The performance of the wave-guiding walls was evaluated through analyzing the comprehensive wave power conversion characteristics and electrical power output under varying wave periods, incident wave angles, and turbine operating modes. Key findings include: Firstly, the highest preliminary-phase energy conversion efficiency achieved with wave-guiding walls was 1.17, representing a 140.2% improvement over configurations without wave-guiding walls. Secondly, while the subsequent-phase conversion efficiency showed low sensitivity to the presence of wave-guiding walls, notable differences were observed in the internal flow dynamics of the U-shaped flow channel and the operational characteristics of the turbine rotor. Thirdly, systems integrated into a conventional straight coast exhibited maximum electrical power output under long-period waves. In contrast, in systems with wave-guiding walls, an increased ultimate conversion efficiency in short-period waves led to the highest electrical power output. Finally, with wave-guiding walls, preliminary-phase efficiency increased significantly with the incident wave angle in short-period waves, while in long-period waves, a greater incident wave angle reduced preliminary-phase efficiency due to the stronger diffraction effects of long waves. These findings highlight the potential of wave-guiding walls to significantly enhance wave energy capture efficiency in OWC structures integrated into straight coasts, demonstrating their effectiveness and adaptability across diverse wave conditions.

Keywords: Wave power; OWC; Wave focusing; Air turbine; Straight coast; Incident wave angle (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1016/j.rser.2025.115623

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