Studi Numerik Pengaruh Rasio Diameter Silinder Pengganggu Di Depan Returning Blade Turbin Angin Savonius Myring n=1 Dengan Fin

A previous experimental study showed that additional fin with various diameter in front of returning blade of Savonius wind turbine with myring n=1 could increase its performance. However, flow visualization techniques like velocity contours, velocity Streamline and pressure contours couldn’t be seen. Therefore this research utilized Computational Fluid Dynamic (CFD) software with 3 dimensional model to visualize its flow and enhance the turbine performance. The study focused on the turbine with myring n=1. The additional fin diameter and height are 40 cm. The simulations were conducted with different variations of stagger diameter i,e. ds/D = 0.4 ; ds/D = 0.5; ds/D = 0.6; ds/D = 0.7. The wind speed was 6 m/s. Simulation were carried out to find out the best value of Coeficient of Torque (Ct), Coeficient of Power (Cp), and also visualize the turbine flow. The best result is in the cp value of 0.367 at tsr 0.8. It means that the turbine performance increases 11.59 % compared with no stagger on diameter variation of ds/D = 0.4.