Based on the results of a two-dimensional hydrofoil obtained by computational fluid dynamics(CFD), the best angle of attack for the hydrofoil determined firstly by means of the lift to drag ratio chart at various angles of attack. The three-dimensional blades of a horizontal axis current turbine with 20 kW rated power were designed by using the Wilson method in Matlab. The hydrodynamic characteristics of the current turbine, such as the power, moment and axial thrust coefficients were predicted using CFD under different pitch angles and tip speed ratios. The static structural characteristics were also calculated using finite element method under various hydro-loads, the stress and strain in the blades were analyzed. The results showed that increasing pitch angle in the range of 1°-5° could be helpful to reduce the starting moment at a low tip speed ratio, moreover, increasing pitch angle can reduce the axial load, deformation and stress when the axial flow velocity is too high. The power coefficient of the turbine can reach to 0.301 and its structure can meet the requirements of material strength under the optimal operating condition. These achievements can be favourable to the design and optimization of marine current turbines.
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