The Influence of Moving Deflector Angle to Positive Torque on the Hydrokinetic Cross Flow Savonius Vertical Axis Turbine

Abstract

Nowadays, the experts are being chased by time to find a substitution for fossil energy and develop the use of renewable energy that is environmentally friendly. This study introduces the new model of Vertical Axis Hydrokinetic Turbine using a pair of a savonius tandem blade (STB). When the flow is coming onto the left side of the vertical axis turbine, the rotor will be rotated clockwise, while the flow on the right side of the rotor will become an obstacle of its rotation due to a negative torque generated by the flow itself. The aim of developing a new model of this turbine is to counter the negative torque which is usually common in the vertical axis turbine and also to improve the efficiency. The research methodology is using CFD Simulation and the Response Surface Method (RSM). Variation of the angle of moving plate deflector (MPD) is (a) the radial MPD, and (b) the tangential MPD. Based on simulation and analytical review proved that a pair of STB which is combined with the tangential MPD has a higher capability to increase the positive torque than that combined with the radial MPD.