The Study of Aerodynamics and Productivity of the Savonius Rotor with Supplementary Blades

In this paper, the influence of the ends of the plates on the productivity of the Savonius wind turbine (SWT) with additional blades has been investigated numerically and experimentally. Initially, three-dimensional (3D) unsteady modeling is implemented for a turbine with and without endplates (EP), keeping the rotor dimensions fixed in both cases. Our simulation has been performed using the "k-epsilon/realizable turbulence model" with the auxiliary of the "finite volume solver ANSYS Fluent 19.1". The coefficients of the torque and power "Cp and Ct" are estimated for any case depending on the tip speed ratio (TSR). The contours of velocity, stress, pressure, and disturbance strength are obtained and studded for the rotor with EP. Finally, a wind tunnel test is performed to prove the simulation results. The numerical results exposed that the highest value of Cp is 0.25 at TSR = 0.7 for the rotor with EP with an improvement of 26% over the same rotor without EP. Moreover, results proved that the maximum improvement in Cp for the rotor with EP was 38% at TSR = 0.4. However, the wind tunnel tests for the rotor with EP demonstrated the Cp max to be 0.226.