An Experimental Study of Pile-Supported OWC-Type Breakwaters: Energy Extraction and Vortex-Induced Energy Loss
An Experimental Study of Pile-Supported OWC-Type Breakwaters: Energy Extraction and Vortex-Induced Energy Loss
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DOI：
10.3390/en9070540
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发表时间：
2016-07
期刊：
影响因子：
3.2
通讯作者：
F. He;Mingjia Li;Zhenhua Huang
中科院分区：
文献类型：
--
作者：
F. He;Mingjia Li;Zhenhua Huang
波浪能转换器与防波堤的集成是波浪能利用的一个很有前途的概念。桩承式振荡水柱防波堤在满足防浪要求的基础上，还可以满足远离陆地的当地用电需求。本文采用两点法对桩承式防波堤的波浪能提取和涡激能量损失进行了分析。通过试验研究了桩承式防波堤的能量提取和涡激能量损失对波能耗散的重要性。结果发现，能量提取和涡致能量损失的趋势一般相关。顶部开孔引起的气动阻尼效应对涡激能量损失的影响大于能量提取。结果表明，气动阻尼越大，能量提取越多;而气动阻尼越小，涡激能量损失对能量耗散越重要。随着吃水的增加，能量提取减少，但涡致能量损失对总能量耗散有补充作用，使总能量耗散与吃水较浅的情况相当。
Integrating wave energy converters with breakwaters is a promising concept for wave energy utilization. On the basis of fulfilling the wave protection demands, pile-supported Oscillating Water Column (OWC)-type breakwaters can also meet the local needs of electricity far from the lands. In the present study, the wave energy extraction and vortex-induced energy loss of pile-supported OWC-type breakwaters were analyzed based on a two-point measurement method. The importance of energy extraction and vortex-induced energy loss on the wave energy dissipation of pile-supported OWC-type breakwaters were experimentally investigated. It was found that the trends of energy extraction and vortex-induced energy loss were generally correlated. The effects of the pneumatic damping induced by top opening affected the vortex-induced energy loss more than the energy extraction. Results showed that a larger pneumatic damping was preferable for the purpose of increasing energy extraction, whereas for a smaller pneumatic damping the vortex-induced energy loss was more important to the energy dissipation. With increasing draft, the energy extraction decreased, but the vortex-induced energy loss complementally contributed to the total energy dissipation and made the energy dissipation at the same level as that for a shallower draft.