Abstract
In South Korea, it is estimated that more than 6GW of potential tidal power is available. Tidal turbines can generate electricity from tidal energy, even at a flow velocity of 1 m/s, but flow a velocity of 2 m/s or more is preferred to ensure economic efficiency. South Korea has abundant tidal energy resources, where the flow velocity is approximately 1 m/s, but a few places have a flow velocity of more than 2 m/s. The aim of this study was to design a low flow rate tidal current turbine system with a diffuser. The blade geometry was designed based on the BEM theory for a design water speed of 1.8 m/s. The power performance of the diffuser was analyzed using Ansys-CFX and optimized using the response surface method. The purpose of turbine performance analysis was to increase the flow rate introduced by the low pressure zone at the rear due to the effects of the flange of the diffuser. The length of the flange was studied to check the flange effect on the turbine performance. The efficiency was calculated as a function of the turbine area with an output coefficient of 0.756 at 1.5 m/s. The efficiency was increased by approximately 32% compared to that of the bare turbine.
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