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Journal of Korean Society of Coastal and Ocean Engineers > Volume 30(6); 2018 > Article
J Korean Soc Coast Ocean Eng 2018;30(6): 242-252. doi: https://doi.org/10.9765/KSCOE.2018.30.6.242
해수소통구를 구비한 진동수주형 파력발전구조물 내에서 공기흐름과 구조물 주변에서 파랑특성에 관한 3차원수치해석(규칙파의 경우)
이광호1, 이준형2, 정익한2, 김도삼3
1가톨릭관동대학교 에너지자원플랜트공학과
2한국해양대학교 대학원 토목환경공학과
3한국해양대학교 건설공학과
3-Dimensional Numerical Analysis of Air Flow inside OWC Type WEC Equipped with Channel of Seawater Exchange and Wave Characteristics around Its Structure (in Case of Regular Waves)
Kwang Ho Lee1, Jun Hyeong Lee2, Ik Han Jeong2, Do Sam Kim3
1Dept. of Energy and Plant Eng., Catholic Kwandong University
2Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University
3Dept. of Civil Eng., Korea Maritime and Ocean Univ., 727 Taejong-ro, Yeongdo-ku, Busan 49112, Korea
Corresponding author: Do Sam Kim ,Tel: +82-51-410-4463, Fax: +82-51-403-0656, Email: kimds@kmou.ac.kr
Received: October 9, 2018;  Revised: November 5, 2018.  Accepted: November 28, 2018.
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It is well known that an Oscillating Water Column Wave Energy Converter (OWC-WEC) is one of the most efficient wave absorber equipment. This device transforms the vertical motion of water column in the air chamber into the air flow velocity and produces electricity from the driving force of turbine as represented by the Wells turbine. Therefore, in order to obtain high electric energy, it is necessary to amplify the water surface vibration by inducing resonance of the piston mode in the water surface fluctuation in the air chamber. In this study, a new type of OWC-WEC with a seawater channel is used, and the wave deformation by the structure, water surface fluctuation in the air chamber, air outflow velocity from the nozzle and seawater flow velocity in the seawater channel are evaluated by numerical analysis in detail. The numerical analysis model uses open CFD code OLAFLOW model based on multi-phase analysis technique of Navier-Stokes solver. To validate model, numerical results and existing experimental results are compared and discussed. It is revealed within the scope of this study that the air flow velocity at nozzle increases as the Ursell number becomes larger, and the air velocity that flows out from the inside of the air chamber is larger than the velocity of incoming air into the air chamber.
Keywords: OWC-WEC, OLAFLOW, channel of seawater exchange, air flow, seawater flow, water level fluctuation, Ursell number
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