Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Numerical and Experimental Study on Linear Behavior of Salter's Duck Wave Energy Converter

비대칭 형상 파력발전 로터의 선형 거동에 대한 수치적·실험적 연구

  • Kim, Dongeun (Faculty of Wind Energy Engineering, Jeju National University) ;
  • Poguluri, Sunny Kumar (Department of Ocean System Engineering, Jeju National University) ;
  • Ko, Haeng Sik (Department of Ocean System Engineering, Jeju National University) ;
  • Lee, Hyebin (Multidisciplinary Graduate School Program for Wind Energy, Jeju National University) ;
  • Bae, Yoon Hyeok (Department of Ocean System Engineering, Jeju National University)
  • 김동은 (제주대학교 풍력공학부) ;
  • ;
  • 고행식 (제주대학교 해양시스템공학과) ;
  • 이혜빈 (제주대학교 풍력특성화협동과정) ;
  • 배윤혁 (제주대학교 해양시스템공학과)
  • Received : 2019.02.26
  • Accepted : 2019.04.11
  • Published : 2019.04.30
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Abstract

Among the various wave power systems, Salter's duck (rotor) is one of the most effective wave absorbers for extracting wave energy. The rotor shape is designed such that the front part faces the direction of the incident wave, which forces it to bob up and down due to wave-induced water particle motion, whereas the rear part, which is mostly circular in shape, reflects no waves. The asymmetric geometric shape of the duck makes it absorb energy efficiently. In the present study, the rotor was investigated using WAMIT (a program based on the linear potential flow theory in three-dimensional diffraction/radiation analyses) in the frequency domain and verified using OrcaFlex (design and analysis program of marine system) in the time domain. Then, an experimental investigation was conducted to assess the performance of the rotor motion based on the model scale in a two-dimensional (2D) wave tank. Initially, a free decay test (FDT) was carried out to obtain the viscous damping coefficient. The pitch response was extracted from the experimental time series in a periodic regular wave for two different wave heights (1 cm and 3 cm). In addition, the viscous damping coefficient was calculated from the FDT result and fluid forces, obtained from WAMIT, are incorporated into the final response of the rotor. Finally, a comparative study based on experimental and numerical results (WAMIT & OrcaFlex) was performed to confirm the performance reliability of the designed rotor.

Keywords

References

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