Experimental Study of Hydrodynamic Performance of Backward Bent Duct Buoy (BBDB) Floating Wave Energy Converter

doi:2012.26.6.53

J. Ocean Eng. Technol. > Volume 26(6); 2012 > Article

J. Ocean Eng. Technol. 2012;26(6):53-58.
DOI: https://doi.org/10.5574/KSOE.2012.26.6.053

Kim Sung-Jae,Kwon Jinseong,Kim Jun-Dong,Koo Weoncheol,Shin Sungwon,Kim Kyuhan

School of Naval Architecture and Ocean engineering University of Ulsan,School of Naval Architecture and Ocean engineering University of Ulsan,School of Naval Architecture and Ocean engineering University of Ulsan,School of Naval Architecture and Ocean

부유식 진동수주형 파력발전기(BBDB)의 유체 동역학적 성능 실험 연구

김성재,권진성,김준동,구원철,신성원,김규한

울산대학교 조선해양공학부,울산대학교 조선해양공학부,울산대학교 조선해양공학부,울산대학교 조선해양공학부,관동대학교 에너지플랜트학과,관동대학교 토목공학과

Keywords: Oscillating water column (OWC), Floating wave energy converter, Chamber pressure, Water surface elevation, Motion RAO, 2-D Wave tank experiment

핵심용어: 진동수주, 부유식 파력발전기, 챔버 공기압, 수면 변위, 운동응답함수, 2차원 수조 실험

Abstract

An experimental study on the hydrodynamic performance of a backward bent duct buoy (BBDB) was performed in a 2D wave tank. The BBDB is one of the promising oscillating water column (OWC) types of floating wave energy converters. Two different corner-shaped BBDBs (sharp-corner and round-corner) were used to measure the maximum chamber surface elevations and body motions for various incident wave conditions, and their hydrodynamic characteristics were compared. In order to investigate the effect of the pneumatic pressure inside the chamber, the heave and pitch angle interacted with elevations were compared for both open chamber and partially open chamber BBDBs. From the comparison study, the deviation in the chamber surface elevations between the two shapes of BBDBs was found to be significant near the resonance period, which may be explained by viscous energy loss. It was also found that the pneumatic pressure noticeably affected the chamber surface elevation and body motions.