Performance Enhancement of the Aerodynamics of Savonius Wind Turbine by Wind Flow Control using CFD Analysis

The Savonius Rotor (SR) is gaining more attention for electrical energy generation in urban area. Although Savonius wind rotor produces negative static torque coefficient at every rotor angle, it has been used for simple construction. The curtain has been used to control the wind flow direction in upstream side of the rotor. The performance investigation of the rotor has been done in ANSYS fluent. The focus of the numerical investigation is to increase the Savonius Wind Turbine (SWT) efficiency with and without curtain arrangement in upstream rotor side. As the rotor speed increases with increase of wind speed, so curtain guide the flow direction. The RANS turbulence model is exploited for simulating the fluid flow in front of the rotor. From the simulation it is found that the non-dimensional performance parameters i.e power coefficient $(\mathrm{C}_{\mathrm{p}})$ and torque coefficient (Ct) increases with increase in Tip Speed Ratio (TSR) without curtain design. But the peak value of coefficient of power and torque are noted at lower tip speed ratio with magnitude of 0.67 and 0.68 are obtained from curtain arrangement., which is comparatively higher than without curtain in front of the rotor.