Studi Numerik Pengaruh Variasi Letak Deflektor Di Depan Returning Blade Terhadap Performa Turbin Angin Savonius Dengan Myring n=1

Abstract

This study aims to evaluate the effect of deflector position variations in front of the returning blade on the performance of Savonius wind turbines using blade shapes with Myring n = 1. Previous studies have evaluated this configuration experimentally, but have not been able to provide a comprehensive visualisation of fluid flow, such as streamline velocity, velocity contours, and pressure contours. Therefore, in this study, three-dimensional Computational Fluid Dynamics (CFD) numerical simulations were conducted to validate the experimental results and present flow visualisations. The simulation was conducted using a turbine with a diameter and height of 0.4 m, a constant wind speed of 6 m/s, and variations without a deflector and with a deflector positioned at distances of 10 cm, 20 cm, 30 cm, and 40 cm. The simulation results showed that the use of a deflector could increase the Coefficient of Torque (Ct) and Coefficient of Power (Cp) values, with a Coefficient of Torque (Ct) performance of 0.5127 at TSR 0.4 and a Coefficient of Power (Cp) of 0.2771 at TSR 0.8 without a deflector and at a deflector distance of 20 cm with a Coefficient of Torque (Ct) at TSR 0.4 with a value of 0.6089 and a Coefficient of Power (Cp) at TSR 0.8 with a value of 0.2933. The Cp value increased by 5.82% compared to without a deflector.