Optimization of Blade Geometry for Two Bladed Savonius Wind Turbine

Savonius wind turbine (SWT) is an attractive power generation system due to its special qualities such as simplicity, reliability, very low noise production and best substitute for power generation of domestic applications at low wind regions. Performance test of savonius wind turbines always helps for analysing designs, optimizing parameters and for the maintenance of new plants in better way. The present paper discusses an experimental investigation on the performance of two bladed SWT having 1 m height and 1 m chord length installed in DBS Institute of Technology, Kavali (14.913°N, 79.992921°E) based on blade geometry. For performance testing, savonius rotor is initially operated at four different overlap (0.3, 0.4, 0.5 and 0.6 m) values on conventional arrangement (blade arc angle as 180°) and later employed five blade arc angles (180°, 185°, 190°, 195° and 200°) for operation. The optimum values of overlap ratio and blade arc angle are identified to achieve maximum performance. The range of tip speed ratio (TSR) from 0.4 to 0.69 is taken based on the availability of wind speed (8–40 km/h) during the period from 1st April 2022 to 30th October 2022.