This study investigates the passive performance enhancement of a Savonius wind turbine using a stationary cylindrical deflector, comparing it to a baseline configuration without a deflector. Parametric optimization of deflector parameters—angular position (𝛼), gap
distance (𝐺), and deflector size (𝑟𝑐), normalized to the rotor diameter (𝐷𝑟)—is performed via computational experiments to maximize efficiency. At a tip speed ratio (TSR) of 0.8, the optimized deflector configuration (𝛼 = 32◦, 𝐺 = 0.023𝐷𝑟 , 𝑟𝑐 = 0.3𝐷𝑟 ) achieves a 29% increase in power coefficient (𝐶𝑃) over the baseline. This improvement stems from the consistent generation of torque across all azimuthal angles (𝜃). While the baseline exhibits
significant torque dead zones (near-zero or negative torque coefficients), the deflector reduces these to minimal negative excursions, effectively eliminating operational dead zones and ensuring smoother energy extraction.
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