CFD Analysis of The Stage-Ratio Factor on Savonius Wind Turbine Performance to Optimize Clean-Energy Conversion

Department of Industrial Engineering, Universitas Jenderal Soedirman, Purbalingga, Indonesia

^* Corresponding author: dandun.mahesa@unsoed.ac.id

Abstract

In Indonesia, 50% of electrical energy is supplied by coal via electric steam power plants, with the remaining 14% supplied by new renewable energy sources. This phenomena demonstrates a significant divergence in the utilization of fossil energy sources against new renewable energy sources. The impact of fossil energy sources is the occurrence of global warming and non-renewable energy sources, a transition process to clean energy produced from renewable energy is required. Hydro, wind, and bioenergy are all possible renewable energy sources in Indonesia. The potential for converting wind energy into electrical energy in Indonesia is relatively large, at 159 GW. The rotor in the wind turbine is one of the primary components that plays a part in reversing the kinetic energy of the fluid into electrical power. Savonius is a simple rotor that can be used to generate power from wind on a small scale. Savonius' merits are its basic structure and ability to function at low wind speeds. This study was carried out on a Stage-ratio variation on a two-stage Savonius rotor with a Phase Shift-Angle of 30˚. The boundary condition is steady-state, and the turbulence type employed in modeling is SST. The goal of this research is to provide an optimal design for the Savonius Wind turbine as a design consideration in local-scale wind energy management, as well as to contribute to the attainment of the SDGs by 2030 through clean energy. Optimal design for Savonius with a PSA of 30˚ was produced Cpmax 0.29 with Stage-ratio 2:1.