The Oscillating Water Column (OWC) device is recognized as one of the most promising Wave Energy Converters (WECs) for its high efficiency and structural simplicity. Dual-chamber OWC-WEC has been considered as the one with more apparent advantage of capturing wave energy than the single-chamber device. Therefore, the paper presents an experimental study, which was performed in a wave-current flume at State Key Laboratory of Coastal and Offshore Engineering of Dalian University of Technology, on the hydrodynamic performance of a 3D offshore-stationary dual-chamber OWC device with cylindrical type. The single-chamber OWC device is also included for comparison in the experiment. The optimal power taken-off (PTO) damping is simulated by using an orifice on the ceiling of the air chamber. It is found that the dual-chamber OWC can increase the hydrodynamic efficiency in the resonant frequency domain in comparison with the single-chamber one. Then, the effects of the drafts of two sub-chambers are discussed with the different incident waves. It is observed that a proper set of two sub-chambers drafts can enhance the OWC hydrodynamic performance in the high-frequency domain.
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