On the efficiency of energy harvesting using vortex-induced vibrations of cables |
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| Institution: | 1. Département de Mécanique, LadHyX, École Polytechnique, 91128 Palaiseau, France;2. Institut de Mécanique des Fluides de Toulouse, Université de Toulouse and CNRS, 31400 Toulouse, France;3. Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003, USA;1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education of China, College of Power Engineering, Chongqing University, Chongqing 400044, China;2. College of Resources and Environmental Science, Chongqing University, Chongqing 400044, China;3. Mechanical & Industrial Engineering, University of Toronto, Toronto, ON M5S 3G8, Canada;1. Energy Research Institute at NTU, Interdisciplinary Graduate School, Nanyang Technological University, Singapore 639798, Singapore;2. School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore;3. School of Electrical & Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore;4. Energy Research Institute at NTU, Nanyang Technological University, Singapore 639798, Singapore;1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education of China, Chongqing University, Chongqing, China;2. Marine Renewable Energy Laboratory, Dept. of Naval Architecture & Marine Engineering, University of Michigan, 2600 Draper Road, Ann Arbor, MI 48109-2145, USA;3. Department of Mechanical Engineering, University of Michigan, USA;4. Vortex Hydro Energy, USA;5. College of Power Engineering, Chongqing University, Chongqing, China |
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| Abstract: | Many technologies based on fluid–structure interaction mechanisms are being developed to harvest energy from geophysical flows. The velocity of such flows is low, and so is their energy density. Large systems are therefore required to extract a significant amount of energy. The question of the efficiency of energy harvesting using vortex-induced vibrations (VIV) of cables is addressed in this paper, through two reference configurations: (i) a long tensioned cable with periodically-distributed harvesters and (ii) a hanging cable with a single harvester at its upper extremity. After validation against either direct numerical simulations or experiments, an appropriate reduced-order wake-oscillator model is used to perform parametric studies of the impact of the harvesting parameters on the efficiency. For both configurations, an optimal set of parameters is identified and it is shown that the maximum efficiency is close to the value reached with an elastically-mounted rigid cylinder. The variability of the efficiency is studied in light of the fundamental properties of each configuration, i.e. body flexibility and gravity-induced spatial variation of the tension. In the periodically-distributed harvester configuration, it is found that the standing-wave nature of the vibration and structural mode selection plays a central role in energy extraction. In contrast, the efficiency of the hanging cable is essentially driven by the occurrence of traveling wave vibrations. |
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| Keywords: | Efficiency Energy harvesting Vortex-induced vibrations Cable Wake-oscillator Waves |
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