Summary:
In this study, six Savonius wind turbine models with different blade geometries were experimentally investigated in an open wind tunnel. The experimental analysis focused on torque, rotational speed, and aerodynamic efficiency. The results clearly indicate that blade geometry has a significant influence on turbine performance.

Among the classical semi-cylindrical designs, Model 2 demonstrated higher and more stable torque compared to Model 1. For the helical blade configurations, Model 4 produced approximately 40% higher torque than Model 3 under higher load conditions. Within the hybrid models, Model 6 consistently outperformed Model 5, generating nearly 50% higher torque across all load ranges and achieving the best overall efficiency.

In conclusion, hybrid and optimized blade geometries provide superior performance even under low wind speed conditions, highlighting their strong potential for small-scale wind energy applications.