Studi Numerik Pengaruh Sudut Deflector di samping Advancing Blade terhadap Performa Turbin Angin Savonius dengan Myring n = 1

Abstract

In the previous experiment, the research of Savonius Wind Turbine with myring n = 1 has been conducted by varying deflector angles.   The result showed  that additional deflector next to advancing blade could improve the turbine performance. However, the experiment did not produce visualisation of streamline, velocity and pressure contours around the turbine. This visualization is important to know more about the turbine performance result in detail. Based on the above condition, this study was conducted by using Computational Fluid Dynamics (CFD) method as a complement to the experimental data. The simulated turbine has a diameter ratio (ds/D) of 0.4. It used deflector variations next to the advancing blade with angles of 15^o, 30^o, 45^o. The wind speed was 7 m/s. With CFD, the visualisation of the airflow around the turbine can be analyzed and clearly seen. It showed that the deflector could increase the Coefficient of Torque (Ct) and Coefficient of Power (Cp) values. The best performance was achieved at a deflector angle of 15° with maximum Ct at TSR 0.4 and Cp at TSR 0.8, while the Cp value increased by 25.128%, and the Ct value increased by 3.10%.