Wind turbines are generally categorized as either vertical or horizontal axis, based on the relative alignment between the direction the wind is blowing and the turbine axis of rotation. Vertical axis wind turbines are often favored for small-scale power generation because their performance is not dependent on relative wind direction, allowing generation equipment to be located on the ground shaft, resulting in reduced maintenance costs. The Savonius wind turbine is a common type of vertical axis wind turbine that generates torque through the combined effects of side forces and drag. The advantages of these turbines over other types of wind turbines are (i) simple structure and low cost, (ii) ability to operate under complex turbulent flows, (iii) good starting performance, and (iv) low noise emission due to low rotation speed. The main problem with traditional Savonius turbines is their significantly low power coefficients compared to most lift-type wind turbines, such as horizontal axis and Darrieus wind turbines. In this project, I proposed new blade shapes with higher power conversion efficiency compared to conventional design. A three-dimensional Computational Fluid Dynamics (CFD) study on Savonius vertical axis two-bladed Savonius wind turbine is conducted and the effects of varying blade fullness, rotor angular velocity, and incoming wind velocity are studied. The numerical results are validated against experimental data available in the literature.

Conventional Savonius Wind Turbine Blades

Computational Mesh

Velocity Field

Wall Shear Stress