An Experimental Investigation of the Effect of Placing a Cylinder in Front of the Returning Side on Overlap Savonius Wind Turbine Performance

Wind is a renewable energy source and has potential for developing the Savonius wind turbine. However, the Savonius turbine typically exhibits low performance and requires further optimization. One approach to enhance its performance is through overlap modification, which improves turbine rotation efficiency. Additionally, adding a cylinder in front of the returning blade can further increase performance by reducing drag force. In this study, the turbine’s performance was enhanced using both overlap modification and an additional disturbance cylinder. The experimental setup employed an original Savonius wind turbine with a diameter and height of ۰.۴ m, an overlap ratio of ۰.۳, and a cylinder with a diameter ratio of ds/d=۰.۴. Various distance ratios (S/d) of ۱.۴, ۱.۷, ۲.۰, and ۲.۳ were tested under wind velocities of ۵ m/s, ۶ m/s, and ۷ m/s. The resulting torque and power coefficients were measured. The best performance was achieved at a distance ratio of ۱.۷ and a wind velocity of ۵ m/s, with the power coefficient (Cp) increasing by approximately ۲۱.۱۳% compared to the original Savonius turbine.

کلیدواژه ها:

renewable ، Savonius wind turbine ، Overlap ، power coefficient