Enhancing the Performance of the Savonius Wind Turbine by Adding a Circular Cylinder Beside the Concave Blade

This paper presents the effect of adding a circular cylinder beside the concave turbine blade on the performance of the Savonius wind turbine. In this study, a circular cylinder with a diameter (d) 0.5 times the turbine rotor diameter (D) is installed beside a concave turbine blade at a distance between the circular cylinder and the centre of the turbine relative to the rotor turbine diameter (Y/D) varied of 1.23 to 2.09 and for the Reynolds number (Re) of 120,000. The study was conducted through numerical simulations using the Ansys-Fluent software. The results indicated that placing a circular cylinder beside the concave blade at a distance of Y/D = 1.32 can increase turbine performance by 21.7% higher than the conventional turbine. In addition, placing a circular cylinder beside the concave blade can also enhance the turbine's self-starting capability.