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http://dx.doi.org/10.9765/KSCOE.2012.24.2.077

A Study on Seawater Flow Characteristics inside the Shrouds used in Tidal Current Generation Systems for Various Geometric Angles under Constant Tidal Current Velocity  

Kim, Jong-Won (Division of Mechanical and Automotive Engineering, Wonkwang University)
Lee, Sang-Ho (Division of Mechanical and Automotive Engineering, Wonkwang University)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.24, no.2, 2012 , pp. 77-83 More about this Journal
Abstract
Numerical analyses through Computational Fluid Dynamics have been performed to investigate the seawater flow field characteristics for various shrouds used in horizontal axis tidal current turbine systems. Seawater flow characteristics are largely influenced under constant tidal current velocity by the shroud geometry and there is considerable difference in fluid velocity distributions around the shrouds. Especially the location and magnitude of maximum seawater flow velocity directly affect turbine performance for power generation. For the cylinder-diffuser type shroud system whose cylinder and diffuser parts have the same length accelerated flow region is formed in the overall cylinder part while maximum velocity in the nozzle-diffuser type whose nozzle and diffuser parts have the same length with symmetry, locally appears near the minimum sectional area. In case of cylinder-diffuser type shroud fluid velocity increases rather high compared with current velocity. And fluid velocity at the centerline gradually increases from the entrance, and then decreases rapidly after reaching a peak close to the middle of the cylinder part unlike the nozzle-diffuser while there is not much variation near the rear of the shroud. These results of the seawater flow characteristics with various shroud geometries can be applied to optimal design for the development of efficient tidal current power generation systems.
Keywords
tidal current generation system; shroud; computational fluid dynamics; flow field characteristics;
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