Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Evaluation of the influence of wind speed and angle of attack on the aerodynamic effect of wind turbine blades
Submission Author:
Ranaildo Silva , RN , Brazil
Co-Authors:
Salete Alves, Luiz Guilherme Vieira Meira de Souza, Edália Azevedo de Faria, Maria Thereza dos Santos Silva, Ranaildo Silva
Presenter: Ranaildo Silva
doi://10.26678/ABCM.COBEM2017.COB17-2805
Abstract
According to recent studies by the Brazilian Institute of Geography and Statistics (IBGE), Rio Grande do Norte has become the largest producer of wind energy in Brazil, accounting for more than 30% of the conversion of this energy in the country. This is due to the winds that vary between 20 and 60 km/h and the characteristics considered of great relevance for exploration of the Brazilian wind power matrix. The objective of this work is to evaluate the influence of wind speed and angle of attack on the aerodynamic effect of wind turbine blades. The methodology consisted of a numerical simulation of a NACA 7715 airfoil in a wind tunnel. For that, ANSYS CFX 14.0 software was used to evaluate the attack angles of 0, 45 and 90 degrees and wind speeds of 20, 30 and 60 km/h. By obtaining the velocity and pressure fields of the computational domain, it was possible to prove the theory of aerodynamic lift. In relation to the angles of attack, the 45° angle provided higher values of lift force, although the aerodynamic wake was very prominent, followed by 0° and 90° (angle that provided an aerodynamic stall condition). Regarding velocities, the relation between this property and the lift force was confirmed, since the forces were always greater for the cases with higher velocities.
Keywords
Wind power, Aerodynamic effect, Numerical simulation, NACA 7715
