Abstract
Savonius hydrokinetic turbine is a viable technology for producing small-scale hydropower. The present numerical study proposed a novel deflector system to guide the incoming water stream effectively and to improve the hydrodynamic performance of the conventional Savonius turbine rotor. The combined deflector system comprises two deflectors: a newly proposed wedge-shaped triangular deflector and a circular cylindrical deflector. The triangular deflector is placed upstream of the returning blade, and the circular deflector is positioned upstream of the advancing blade. Different configurations of the proposed deflector system are obtained by varying the dimensions and location of the triangular deflector (deflector 1), while the diameter and location of the circular deflector (deflector 2) are fixed in all configurations. Without a deflector system, the Savonius rotor yields a maximum power coefficient equal to 0.248 at a tip speed ratio (TSR) of 0.7. The best configuration of the combined deflector system yields a maximum power coefficient of around 0.432 at a (TSR) value of 1.0. The deflector-augmented Savonius hydrokinetic rotor records a 73.7% increase in the maximum power coefficient (CPmax) compared to the conventional Savonius rotor. Further, the flow contours verify improved flow interaction with turbine blades and enhanced hydrodynamic performance.
Published Version
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