SAVONIUS TYPE VERTICAL AXIS WIND TURBINE DESIGN AND PARAMETER STUDY

• Main Author: Dilatif, Riswan
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/67757
• Institution: Institut Teknologi Bandung

This final project discusses the Savonius type vertical axis wind turbine which has superior self-starting capability than the Darrieus type so that it is suitable to be applied to wind flow conditions in Indonesia which has a low average wind speed. The Savonius type has a convex and concave base blade shape that has different coefficients of drag so that it produces torque on the turbine. The performance of the Savonius wind turbine is influenced by the geometry and flow parameters. Geometric parameters that affect the performance of the Savonius wind turbine are Blade Shape Factor (BSF), end plate configuration, frontal area, turbine aspect ratio, overlap ratio, and rotor solidity. The flow parameter that affects the performance of the Savonius wind turbine is the tip speed ratio. It is important to have an optimal tip speed ratio, to maximize the power coefficient. The average turbine mechanical power targeted in this study is 40 Watt. The research was conducted using a Computational Fluid Dynamic (CFD) simulation approach using ANSYS Fluent software. The case studied in this study is a low velocity which is assumed to be a steady and incompressible flow and is simulated with steady flow and pressure-based approaches. The simulation was carried out by varying the tip speed ratio flow parameters and the free air flow velocity of 4 m/s. In this study, a Savonius wind turbine model without end plate and a Savonius turbine model with an end plate were made. The addition of the end plate on the turbine model is done to optimize the turbine power coefficient. The simulation results show that the Savonius wind turbine model without end plate reaches its maximum performance when the tip speed ratio is 0.6 with a maximum power of 38.25 Watt and a maximum power coefficient of CP,maks = 0.1220. Meanwhile, the Savonius wind turbine model with end plate achieves maximum performance when the tip speed ratio is 0.8 with a maximum power of 40.03 Watt and a maximum power coefficient of CP,maks = 0.1277.