Hydrodynamic performance of a dual-floater hybrid system combining a floating breakwater and an oscillating-buoy type wave energy converter
Hydrodynamic performance of a dual-floater hybrid system combining a floating breakwater and an oscillating-buoy type wave energy converter
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DOI：
10.1016/j.apenergy.2019.114212
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发表时间：
2020-02
期刊：
影响因子：
11.2
通讯作者：
Heng-ming Zhang;Binzhen Zhou;C. Vogel;R. Willden;J. Zang;Jing Geng
中科院分区：
文献类型：
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作者：
Heng-ming Zhang;Binzhen Zhou;C. Vogel;R. Willden;J. Zang;Jing Geng
发电的高成本阻碍了商业规模的波浪发电业务。这项工作的目标是通过将波浪能提取和海岸保护相结合，提供一种费用分摊的解决方案。利用Star-CCM+计算流体力学软件建立了二维数值波浪水槽，研究了由浮式防波堤和浮筒式波浪能转换器（WEC）组成的双浮子混合系统的水动力性能，并与已发表的实验结果进行了比较。比较了混合系统、单一消力池和单一防波堤的水动力性能差异。WEC防波堤间隙中的波浪共振对系统性能具有显著影响，混合系统在低波浪频率下表现出更好的波浪衰减和波浪能量提取能力，即，更宽的有效频率。由于WEC的存在，防波堤上的力普遍降低。窄间隙中的波共振对非对称WEC混合系统的能量效率有不利影响，而对对称WEC混合系统的能量效率有有利影响。通过增大波浪能转换器的吃水深度和宽度，减小波浪能转换器与防波堤的距离，可以提高混合系统的波浪能转换效率。本文的研究结果使波浪能具有经济竞争力和商业规模的波浪能运营成为可能。
The high cost of power generation impedes commercial-scale wave power operations. The objective of this work is to provide a cost-sharing solution by combining wave energy extraction and coastal protection. A two-dimensional numerical wave tank was developed using Star-CCM+ Computational Fluid Dynamics software to investigate the hydrodynamic performance of a dual-floater hybrid system consisting of a floating breakwater and an oscillating-buoy type wave energy converter (WEC), and was compared with published experimental results. The differences between the hydrodynamic performance of the hybrid system, a single WEC and a single breakwater were compared. Wave resonance in the WEC-breakwater gap has a significant impact on system performance, with the hybrid system demonstrating both better wave attenuation and wave energy extraction capabilities at low wave frequencies, i.e., wider effective frequency. Forces on the breakwater were generally reduced due to the WEC. Wave resonance in the narrow gap has an adverse effect on the energy efficiency of the hybrid system with an asymmetric WEC, while a beneficial effect with a symmetric WEC. The wave energy conversion efficiency of hybrid system can be improved by increasing the draft and width of the WEC and decreasing the distance between the WEC and the breakwater. The findings of this paper make wave energy economically competitive and commercial-scale wave power operations possible.