Abstract
This investigation aims to study experimentally and numerically the performance of a twisted modified Savonius rotor at various twisting angles. The experiments are conducted in front of a free air jet. The computations are performed using the three-dimensional incompressible unsteady Reynolds-Average Navier-Stokes (RANS) equations along with the RNG k-ε turbulence model. The comparison with the present measurements shows good prediction of the RNG k-ε turbulence model to the rotor performance. Furthermore, the power coefficient (CP) and the torque coefficient (CT) at different tip speed ratios (λ) for twist angles ranging from 0° to 180° are predicted under constant aspect ratio of 1.0 and overlap ratio of 0.15. The numerical results show that the maximum power coefficient (CPmax) increases with the increase of twist angle up to an optimum value of 45° and then decreases except for twist angle of 135°. The twisted modified rotor with a twist angle of 45° has the highest CP and CT(0.22 and 0.41, respectively) compared to the other studied twist angles.
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