An experimental investigation into the wave power extraction of a floating box-type breakwater with dual pneumatic chambers |
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| Institution: | 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China;2. Department of Engineering Science, Uppsala University, Uppsala, 75239, Sweden;1. School of Engineering, Computing and Mathematics, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, United Kingdom;2. Centre for Marine and Renewable Energy Ireland (MaREI), Environmental Research Institute & School of Engineering, University College Cork, Ireland;1. National Engineering Laboratory for Port Hydraulic Construction Technology, Tianjin Research Institute for Water Transport Engineering, M.O.T, Tianjin, China;2. College of Transportation, Wuhan University of Technology, Wuhan, Hubei, China;3. College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian, Liaoning, China;4. College of Civil Engineering and Architecture, Hainan University, Haikou, Hainan, China;1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 10084, China;2. Institute of Port, Coastal and Offshore Engineering, Ocean College, Zhejiang University, Zhoushan, 10084, China;1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, 100?084, Beijing, China;2. Institute of Port, Coastal and Offshore Engineering, Ocean College, Zhejiang University, Zhoushan, Zhejiang, China |
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| Abstract: | The oscillating water column (OWC) device is in a leading position for wave power extraction but has not achieved fully commercial at the current stage. In addition to enhancing the OWC performance, installing OWCs on floating breakwaters, which owns the merits of both cost-sharing and offshore power supply, is a practicality with high economic viability. In this study, a series of wave-flume experiments were conducted in regular waves to examine the wave power extraction of a floating box-type breakwater with dual pneumatic chambers. The flow characteristics of the orifices used to simulate the PTOs was pre-calibrated through another series of experiments, so the power extraction in this study can be obtained with only the pressure measurement. The effects of wave period, chamber draft, water depth and arrangement of chambers on the power extraction were examined. Our experimental results showed that the power extraction was mainly due to the water column oscillation inside the chamber, and differentiation in the designed natural periods of dual chambers could widen the efficiency bandwidth of power extraction. The front chamber always played the main role in power extraction and its natural period should be designed against the dominating period of the wave spectrum; in contrast, the power extraction of the rear chamber was only a supplement and its natural period should be designed against longer waves which were more easily transmitted, thus a PTO of small power capacity maybe more realistic. It was also worth noting that the water column oscillation was more dependent on the wave period rather than controlled by the wave scattering under different water depths. |
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| Keywords: | Experimental investigation Wave power extraction Oscillating water column Floating breakwater |
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