STUDI NUMERIK PENGARUH VARIASI SUDUT DEFLEKTOR DI SAMPING ADVANCING BLADE TURBIN ANGIN SAVONIUS MYRING n=1 DENGAN PENAMBAHAN PANJANG BUSUR 4 CM PADA KECEPATAN 7 m/s

Abstract

Savonius wind turbine performance with myring n=1 and additional deflector next to the advancing blade has improved in the previous experimental studies. Although the performance has improved, but its flow visualization such as velocity contours, streamline velocity, and pressure contours cannot be displayed. Therefore, this study was conducted to visualize the turbine flow. The 3D Computational Fluid Dynamic (CFD) method was used to obtain the Coefficient of Torque (Ct), Coefficient of power (Cp), and describe the flow visualization. The steps began with geometry creation, meshing, model validation, and variation simulation. A 4 cm long arc and deflector angle  variation placed next to the advancing blade were added to the wind turbine. The dimensions of the turbine used, both in height and diameter, were 40 cm. The variation in the deflector angles were 0°, 15°, 30°, and 45° and  wind speeds were 5 m/s, 6 m/s, and 7 m/s. The best results were obtained at a speed of 7 m/s, at a deflector angle of 15° with an increase of 56.1% when it was compared to the turbine without any deflector with a Coefficient of power (Cp) value simulation of 0.2582.