期刊
INTERNATIONAL JOURNAL OF MARINE ENERGY
卷 3-4, 期 -, 页码 27-40出版社
ELSEVIER
DOI: 10.1016/j.ijome.2013.11.003
关键词
Marine current turbine; Tidal turbine; Towing-tank experiments; Surface gravity waves; Fatigue loading; Phase averaging
资金
- Office of Naval Research
Surface gravity waves can significantly impact operating conditions for a marine current turbine, imparting unsteady velocities several orders of magnitude larger than the ambient turbulence. The influence of surface waves on the performance characteristics of a two-bladed horizontal axis marine current turbine was investigated experimentally in a large towing tank facility at the United States Naval Academy. The turbine model had a 0.8 m diameter (D) rotor with a NACA 63-618 cross section, which is Reynolds number independent with respect to lift coefficient in the operating range of Re-c approximate to 4 x 10(5). The torque, thrust and rotational speed were measured at a range of tip speed ratios (TSR) from 5 < TSR < 11. Tests were performed at two rotor depths (1.3D and 2.25D) with and without waves. The average turbine performance characteristics were largely unchanged by depth or the presence of waves. However, tests with waves indicate large variations in thrust, rotational speed, and torque occurred with the passage of the wave. These results demonstrate the impact of surface gravity waves on power production and structural loading and suggest that turbines should be positioned vertically within the water column at a depth which maximizes power output while minimizing material fatigue. Published by Elsevier Ltd.
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