Wave Power Focusing due to the Bragg Resonance |
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| Authors: | TAO Ai-feng YAN Jin WANG Yi ZHENG Jin-hai FAN Jun and QIN Chuan |
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| Institution: | State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;College of Harbor Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China,College of Harbor Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China,College of Harbor Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China,State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;College of Harbor Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China,College of Harbor Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China and College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | Wave energy has drawn much attention as an achievable way to exploit the renewable energy. At present, in order to enhance the wave energy extraction, most efforts have been concentrated on optimizing the wave energy convertor and the power take-off system mechanically and electrically. However, focusing the wave power in specific wave field could also be an alternative to improve the wave energy extraction. In this experimental study, the Bragg resonance effect is applied to focus the wave energy. Because the Bragg resonance effect of the rippled bottom largely amplifies the wave reflection, leading to a significant increase of wave focusing. Achieved with an energy conversion system consisting of a point absorber and a permanent magnet single phase linear motor, the wave energy extracted in the wave flume with and without Bragg resonance effect was measured and compared quantitatively in experiment. It shows that energy extraction by a point absorber from a standing wave field resulted from Bragg resonance effect can be remarkably increased compared with that from a propagating wave field (without Bragg resonance effect). |
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| Keywords: | wave power experiment Bragg resonance |
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