Abstract
This investigation is focused on studying the flow physics around a modified Bach and Benesh profiles of Savonius rotor. A considerable amount of research has been done on improving the efficiency of Savonius rotors by optimizing the various design parameters. But most of these studies concentrate on power and torque coefficients. Deeper investigation of drag and lift characteristics could result in refining the efficiency. In view of this, 2D unsteady simulations are conducted using multi-physics CFD solver to find the instantaneous forces (drag and lift) acting on the rotors. The shear stress transport (SST) k-ω turbulence model is used for solving 2D unsteady Reynolds Averaged Navier-Stokes (RANS) equations. The total pressure, velocity magnitude and turbulence intensity contours are created at various angle of rotor rotation. The investigation shows that the drag coefficient (CD) for the modified Bach profile is higher than the Benesh profile. The results obtained are compared with those of semicircular-profile at the identical conditions.
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