Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
COMPARATIVE ANALYSIS OF TWO AIRFOILS FOR POSSIBLE UTILIZATION IN SMALL WIND TURBINES
Submission Author:
Raquel Miguez de Carvalho , SP , Brazil
Co-Authors:
Pedro Baracat, Célia Rosolen, Raquel Miguez de Carvalho, Kamal Ismail, Willian Okita, Tomaz Pablo Cutrim Nascimento Morais, Francisco Olimpio Moura Carneiro
Presenter: Pedro Baracat
doi://10.26678/ABCM.COBEM2019.COB2019-1762
Abstract
The Brazilian national energy matrix is composed principally by hydraulic energy. Extending the distribution grid to areas of low population density, long distances from the main grid, remote areas of difficult access and isolated areas usually is not viable and must be attended by alternative ways. Small installation of alternative energy resources such as wind, solar and residual biomass incinerators are among the strong candidates for these sites. The objective of this study is to compare the efficiency of two different airfoils, the S809 airfoil, commonly used for this purpose, and the NACA 4412 airfoil, used in aircraft propulsion, for a nominal power generation of 10 kW with an average wind speed of 8.73 m/s, which is found in some regions in Northeast of Brazil. This work reports the influence of the geometry and operating conditions on the power coefficient. The blade element method (BEM) is implemented in a Matlab home built code which was optimized and validated against available experimental results. The pitch and chord distributions along the blade, the axial and tangential induction factors, the distribution of thrust, torque and power and the annual generated power were calculated and commented.
Keywords
wind energy, NACA 4412, S809, Blade element Momentum, small wind turbine
