Design and Analysis of Vertical Axis Wind Turbine for Household Application

A hybrid turbine with combination of Savonius and Darrieus is being investigated in an effort to improve the coefficient of power with same aspect ratio. To achieve this objective, first Savonius turbine is experimentally tested with gap between central shaft and rotor with two blades, three blades and four blades. Tests show that the coefficient of power of three blades rotor is higher than that of the two and four blades at low wind speed. Further the Savonius, Darrieus and modified Hybrid turbines are tested at different wind velocities through wind tunnel. Investigation is carried out to study the effect of geometrical and operational parameters on the performance of a turbine in terms of coefficient of power, coefficient of static torque and coefficient of torque. The modified hybrid turbine gives higher coefficient of power (0.23) at a low wind speed, as compared to that of Savonius rotor (0.19) and Darrieus three blade rotor (0.21). Hence it is proposed to be used for household application for power generation at rural and urban areas. However the parameters of the hybrid turbine need to be optimized to commercialize this turbine.