Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Performance Evaluation of an Axisymmetric Floating Wave Power Device with an Oscillating Water Column in the Vertical Cylinder

진동 수주형 축대칭 부유식 파력발전장치의 성능평가

  • Park, Woo-Sun (Coastal Engineering Division, Korea Institute of Ocean Science & Technology) ;
  • Jeong, Shin Taek (Department of Civil and Environmental Engineering, Wonkwang University) ;
  • Choi, Hyukjin (Department of Civil and Environmental Engineering, Wonkwang University) ;
  • Lee, Uk Jae (Department of Civil and Environmental Engineering, Wonkwang University)
  • 박우선 (한국해양과학기술원 연안공학연구본부) ;
  • 정신택 (원광대학교 토목환경공학과) ;
  • 최혁진 (원광대학교 토목환경공학과) ;
  • 이욱재 (원광대학교 토목환경공학과)
  • Received : 2017.12.12
  • Accepted : 2018.02.23
  • Published : 2018.02.28
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Abstract

In order to evaluate the performance of the floating wave power, which is an axisymmetric oscillating water column type, linearized free surface boundary condition considering the influence of PTO (power takeoff) was derived and a finite element numerical model was established. Numerical experiments were carried out by varying cylinder length, skirt length, and depth of water, which are design parameters that can change the resonance of water column in cylinder and heave resonance of the float, which is considered to affect the power generation efficiency. Finally, the basic data necessary for the optimum design of the power generation system were obtained. As a result, the efficiency of the power generation system is dominated by the heave motion resonance of the float rather than the water column resonance in the cylinder, and the resonance condition for the heave motion can be changed efficiently by attaching the skirt to the outside of the buoy.

축대칭 진동수주형 부유식 파력발전의 성능을 평가하기 위하여 PTO를 고려한 선형화된 자유수면경계조건을 유도하여 유한요소 수치모델을 수립하였다. 발전효율에 영향을 미칠 것으로 판단되는 동력인출장치(PTO)가 설치되는 실린더내 수주의 공진현상과 부유체의 heave 공진현상에 직접적으로 영양을 줄 수 있는 설계변수인 실린더 및 스커트 길이, 그리고, 수심을 변화시키며 수치실험을 실시하여 발전시스템의 최적설계에 필요한 기초 자료를 확보하였다. 연구결과, 발전시스템의 효율은 실린더내 진동수주의 공진보다는 부유체의 heave 운동 공진에 지배되며, 부이 외측에 스커트를 부착함으로써 효율적으로 공진조건을 변화시킬 수 있음을 확인하였다.

Keywords

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