Abstract Multi-functional platform is a promising way to enhance the economic power production from multiple renewable energy sources. This paper investigates numerically and experimentally the hydrodynamic performance of an oscillating water column (OWC) wave energy converter (WEC), integrated into a monopile-mounted offshore wind turbine (OWT). Based on linear potential flow theory, a 3D time-domain numerical model was developed, based on the higher-order boundary element method, to investigate the coupled hydrodynamic response of a cylindrical-type OWC device. A nonlinear pneumatic model was utilized to simulate the turbine damping. Experiments on the integrated system were carried out in a wave flume at Dalian University of Technology. The numerical results agree well with the experimental studies, including i) the surface elevation and air pressure inside the chamber, ii) wave pressure on the OWT monopile and iii) hydrodynamic efficiency. Furthermore, the effects of the OWC damping and wave steepness on the OWC-OWT system were investigated. It was found that the introduction of the OWC can significantly reduce the horizontal force and overturning moment on the OWT monopile, and that the wave steepness has a significant influence on the OWC efficiency, especially at resonance.

中文翻译：

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集成到 OWT 单桩中的 OWC 波浪能转换器的水动力研究

摘要 多功能平台是提高多种可再生能源经济发电量的有效途径。本文通过数值和实验研究了振动水柱 (OWC) 波浪能转换器 (WEC) 的水动力性能，该转换器集成到单桩式海上风力涡轮机 (OWT) 中。基于线性势流理论，建立了基于高阶边界元法的3D时域数值模型，研究了圆柱型OWC装置的耦合水动力响应。利用非线性气动模型来模拟涡轮阻尼。集成系统的实验在大连理工大学的波浪水槽中进行。数值结果与实验研究吻合，包括 i) 舱内的表面高度和气压，ii) OWT 单桩上的波浪压力和 iii) 水动力效率。此外，研究了 OWC 阻尼和波陡度对 OWC-OWT 系统的影响。结果表明，OWC 的引入可以显着降低 OWT 单桩的水平力和倾覆力矩，并且波陡度对 OWC 效率有显着影响，尤其是在共振时。