Hydrodynamic performance of a floating breakwater as an oscillating-buoy type wave energy converter
Hydrodynamic performance of a floating breakwater as an oscillating-buoy type wave energy converter
复制标题
DOI：
10.1016/j.apenergy.2019.113996
复制
发表时间：
2020-01
期刊：
影响因子：
11.2
通讯作者：
Heng-ming Zhang;Binzhen Zhou;C. Vogel;R. Willden;J. Zang;Liang Zhang
中科院分区：
文献类型：
--
作者：
Heng-ming Zhang;Binzhen Zhou;C. Vogel;R. Willden;J. Zang;Liang Zhang
组合浮式防波堤和波能转换系统有可能为海上电力供应和海岸保护提供具有成本效益的解决方案。这将使波能在经济上具有竞争力和商业规模的波能运营成为可能。本文研究了满足波能提取和衰减双重目标的波能转换器的水动力特性。基于粘性计算流体力学理论，利用Star-CCM+商业软件建立了二维数值模型，研究了规则波作用下振动浮标换能器(WEC)浮式防波堤的水动力性能。文中提出的模型与已发表的实验结果进行了验证。研究了对称和非对称浮体的水动力性能，包括方形底、三角形底(带和不带挡板)和Berkley楔形浮体的消波和能量提取性能。研究发现，非对称浮子具有更高的功率转换效率和更好的消波性能，尤其是Berkeley楔形底部装置和三角折流板底部装置。三角形折流板底部装置具有更简单的几何结构，获得了与Berkeley楔形装置相似的波浪衰减和能量提取特性。三角形折流板底部浮子的最大能量转换效率达到93%，在众多波能转换设计中是一种令人印象深刻的WEC装置。这种新提出的三角形折流板底部WEC型浮体具有很大的潜力，可以作为一种理想的海岸结构物，既可以保护海岸，又可以提取波浪能量。
Combined floating breakwater and wave energy converter systems have the potential to provide a cost-effective solution to offshore power supply and coastal protection. This will make wave energy economically competitive and commercial-scale wave power operations possible. This paper investigates the hydrodynamic features of wave energy converters that meet the dual objectives of wave energy extraction and attenuation for such a combined system. A two-dimensional numerical model was established using Star-CCM+ commercial software based on viscous Computational Fluid Dynamics theory to investigate the hydrodynamic performance of an oscillating buoy Wave Energy Converter (WEC) type floating breakwater under regular waves. The model proposed in this paper was verified with published experimental results. The hydrodynamics of symmetric and asymmetric floaters were investigated to demonstrate their wave attenuation and energy extraction performance, including square bottomed, triangular bottomed (with and without a baffle plate), and the Berkley Wedge. The asymmetric floaters were found to have higher power conversion efficiency and better wave attenuation performance, especially the Berkeley Wedge bottom device and the triangular-baffle bottom device. The triangular-baffle bottom device with a simpler geometry achieved similar wave attenuation and energy extraction performance characteristics to that of the Berkeley Wedge device. The maximum energy conversion efficiency of the triangular-baffle bottom floater reached up to 93%, an impressive WEC device among many designs for wave energy conversion. There may be a great potential for this newly proposed triangular-baffle bottom WEC type of floater to be an ideal coastal structure for both coastal protection and wave energy extraction.