Effect of the PTO Damping Force on the 2D Oscillating Buoy Wave Energy Converter Integrated into a Pile-Restrained Float
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RESEARCH PAPER
Effect of the PTO Damping Force on the 2D Oscillating Buoy Wave Energy Converter Integrated into a Pile‑Restrained Floating Breakwater Zhe Ma1,2 · Yanjun Mao2 · Yong Cheng3 · Gangjun Zhai1,2 Received: 3 August 2018 / Accepted: 13 May 2019 © Shiraz University 2019
Abstract The aim of the study is to evaluate the parametric effect of a power take-off (PTO) system on an integration system of an oscillating buoy wave energy device with a pile-restrained floating breakwater. To consider the viscous effect, the study is carried out with three conditions using OpenFOAM, i.e., the linear optimal PTO system, the fixed PTO damping coefficient, and the Coulomb PTO system. The results show that the maximum wave energy capture ratio (CWR) of the device can merely reach 0.35 in the present work, when considering the viscous effect. This result is smaller than that obtained from potential flow. In addition, the linear optimal PTO coefficient under viscous flow should be larger than the theoretical optimal coefficient in terms of the potential flow. A comparison of the Coulomb damping model and the linear damping model also shows that the Coulomb damping model has a good performance in terms of both wave energy capture efficiency and coastal protection. Hence, the effect of the PTO system on such an integration system can be an essential factor to achieve an optimal design. Keywords Wave energy converter (WEC) · Integration system · Power take-off (PTO) · OpenFOAM
1 Introduction With the consumption of fossil fuels around the world, the climate has changed rapidly, with serious environmental issues. Humankind has to seek cleaner sources of energy for sustainable development. As a clean energy source, renewable energy sources such as wind energy, solar energy, and ocean energy have received widespread attention and have been under development for a long time. Among these kinds of renewable energies, ocean energy, especially ocean wave energy, has received wide research and development. Falcao (2010) provided a detailed overview of the current wave energy utilization and research; clear classification of the wave energy converter system (WEC) has been carried out. * Yong Cheng [email protected] 1
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
2
Deep Water Research Centre, Dalian University of Technology, Dalian 116024, China
3
Ship and Ocean Engineering School, Jiangsu University of Science and Technology, Zhenjiang 212003, China
The WEC devices that have been tested and prototyped at present are introduced in detail. At the same time, the power take-off system (PTO) and the mooring system are also classified and are given a detailed introduction. However, the high construction costs and the low energy conversion ratio of the WEC are still the reasons that limit the widespread use and development of the WEC. On the one hand, the cost can be reduced by increasing the wave energy conversion rate. Several WEC devices with efficient en
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