Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
INVESTIGATION OF LIFT AND DRAG COEFFICIENTS FOR A LOW REYNOLDS NUMBER AIRFOIL APPLIED TO SMALL URBAN WIND TURBINES
Submission Author:
Mauro Ferraz , PA
Co-Authors:
Mauro Ferraz, Jerson Vaz, Erick Oliveira do Nascimento
Presenter: Mauro Ferraz
doi://10.26678/ABCM.COBEM2021.COB2021-0550
Abstract
Low Reynolds number airfoils are important for designing small wind turbines as they typically are designed to operate at low wind speed. This makes the determination of lift and drag coefficients a challenge that is overlooked in the literature as usually these aerodynamic parameters can be significantly unstable at low wind speed, compromising the starting behavior of small rotors. Hence, in this work, the low Reynolds number airfoil SG6040 is assessed through performance of an optimized small urban wind turbine. The turbine performance analysis is done for Reynolds numbers of 100000, 150000 and 200000. The aerodynamic data of SG6040 are used to design a small 4-bladed wind turbine with 2.0 m rotor diameter in which the Reynolds number is varied along the rotor blade. Such a variation aims to verify the impact of lift and drag forces on the optimization of small wind blades for urban purposes where the wind speed is in general lower. As a result, a small urban wind turbine with efficiency about 49% will be obtained whereas generally small turbines have 20-25% in the literature.
Keywords
small wind turbine, Low Reynolds number airfoil, Blade optimization
