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Numerical and experimental studies on the PTO system of a novel floating wave energy converter

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  • Kim, Byung-Ha
  • Wata, Joji
  • Zullah, Mohammed Asid
  • Ahmed, M. Rafiuddin
  • Lee, Young-Ho

Abstract

Experiments and several numerical studies were done on a power-take off system of a novel floating wave energy convertor. The wave energy convertor utilizes the changes in surface elevation of the waves to cause a column of water to rise and fall periodically in the caisson which creates a bi-directional flow. A cross flow turbine within the device uses this bi-directional flow to rotate in one direction. A 6 DOF ocean simulator was used to conduct experiments on the PTO system at a model to prototype scale of 1:3, for no-load conditions and loaded conditions. In the experiment, the parameters like pitching angles of the device, moment of inertia on the shaft, wave periods and rotational speeds of the turbine were varied. It was found that for all pitching angles, the device had optimum response at a wave period of 3 s. A moment of inertia of 0.053 kg m2 was found to be appropriate for all test cases. Peak hydraulic efficiencies between 35% and 45% were obtained for the range of 40–50 RPM for most test cases. Particle image velocimetry (PIV) tests then done to document and investigate the flow around the turbine and the inlet and exit nozzles. A commercial CFD software was used to carry out the numerical calculations and to observe the internal flow. Finally, a floating body simulation was conducted on to calculate the motion of the device at sea and thus calculate the overall performance of the device.

Suggested Citation

  • Kim, Byung-Ha & Wata, Joji & Zullah, Mohammed Asid & Ahmed, M. Rafiuddin & Lee, Young-Ho, 2015. "Numerical and experimental studies on the PTO system of a novel floating wave energy converter," Renewable Energy, Elsevier, vol. 79(C), pages 111-121.
    • Handle: RePEc:eee:renene:v:79:y:2015:i:c:p:111-121
    DOI: 10.1016/j.renene.2014.11.029
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    References listed on IDEAS

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    1. Paish, Oliver, 2002. "Small hydro power: technology and current status," Renewable and Sustainable Energy Reviews, Elsevier, vol. 6(6), pages 537-556, December.
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    1. Zhongliang Meng & Yanjun Liu & Jian Qin & Shumin Sun, 2021. "Mooring Angle Study of a Horizontal Rotor Wave Energy Converter," Energies, MDPI, vol. 14(2), pages 1-14, January.
    2. Cuadra, L. & Salcedo-Sanz, S. & Nieto-Borge, J.C. & Alexandre, E. & Rodríguez, G., 2016. "Computational intelligence in wave energy: Comprehensive review and case study," Renewable and Sustainable Energy Reviews, Elsevier, vol. 58(C), pages 1223-1246.
    3. Ghasemi, Amirmahdi & Anbarsooz, Morteza & Malvandi, Amir & Ghasemi, Amirhossein & Hedayati, Faraz, 2017. "A nonlinear computational modeling of wave energy converters: A tethered point absorber and a bottom-hinged flap device," Renewable Energy, Elsevier, vol. 103(C), pages 774-785.
    4. Yu, Tongshun & Shi, Hongda & Song, Wenfu, 2018. "Rotational characteristics and capture efficiency of a variable guide vane wave energy converter," Renewable Energy, Elsevier, vol. 122(C), pages 275-290.
    5. Windt, Christian & Davidson, Josh & Ringwood, John V., 2018. "High-fidelity numerical modelling of ocean wave energy systems: A review of computational fluid dynamics-based numerical wave tanks," Renewable and Sustainable Energy Reviews, Elsevier, vol. 93(C), pages 610-630.
    6. Chongfei Sun & Zirong Luo & Jianzhong Shang & Zhongyue Lu & Yiming Zhu & Guoheng Wu, 2018. "Design and Numerical Analysis of a Novel Counter-Rotating Self-Adaptable Wave Energy Converter Based on CFD Technology," Energies, MDPI, vol. 11(4), pages 1-21, March.
    7. Ahn, Soo-Hwang & Xiao, Yexiang & Wang, Zhengwei & Zhou, Xuezhi & Luo, Yongyao, 2017. "Performance prediction of a prototype tidal power turbine by using a suitable numerical model," Renewable Energy, Elsevier, vol. 113(C), pages 293-302.
    8. Ahn, Soo-Hwang & Xiao, Yexiang & Wang, Zhengwei & Zhou, Xuezhi & Luo, Yongyao, 2017. "Numerical prediction on the effect of free surface vortex on intake flow characteristics for tidal power station," Renewable Energy, Elsevier, vol. 101(C), pages 617-628.
    9. Falcão, António F.O. & Henriques, João C.C., 2016. "Oscillating-water-column wave energy converters and air turbines: A review," Renewable Energy, Elsevier, vol. 85(C), pages 1391-1424.
    10. Yubo Niu & Xingyuan Gu & Xuhui Yue & Yang Zheng & Peijie He & Qijuan Chen, 2022. "Research on Thermodynamic Characteristics of Hydraulic Power Take-Off System in Wave Energy Converter," Energies, MDPI, vol. 15(4), pages 1-15, February.
    11. Yadong Wen & Weijun Wang & Hua Liu & Longbo Mao & Hongju Mi & Wenqiang Wang & Guoping Zhang, 2018. "A Shape Optimization Method of a Specified Point Absorber Wave Energy Converter for the South China Sea," Energies, MDPI, vol. 11(10), pages 1-22, October.
    12. Elie Al Shami & Ran Zhang & Xu Wang, 2018. "Point Absorber Wave Energy Harvesters: A Review of Recent Developments," Energies, MDPI, vol. 12(1), pages 1-36, December.
    13. Weerakoon, A.H. Samitha & Kim, Byung-Ha & Cho, Young-Jin & Prasad, Deepak Divashkar & Ahmed, M. Rafiuddin & Lee, Young-Ho, 2021. "Design optimization of a novel vertical augmentation channel housing a cross-flow turbine and performance evaluation as a wave energy converter," Renewable Energy, Elsevier, vol. 180(C), pages 1300-1314.

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