Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
ANALYSIS OF THE INFLUENCE OF VORTEX GENERATORS BY STUDYING THEIR POSITIONS AND GEOMETRIES IN SMALL WIND TURBINES.
Submission Author:
Luann Lopes , CE
Co-Authors:
Luann Lopes, Rafael Espindola, Pamela Vieira, Alex Maurício Araújo
Presenter: Luann Lopes
doi://10.26678/ABCM.COBEM2019.COB2019-1159
Abstract
In order to improve the efficiency of small wind turbines, the present study aims to analyze the influence of devices known as Vortex Generators (GV) from the variation of their positions and geometries. These have the function of generating turbulences in the flow in a controlled and known way. For the position analysis, the simulations were performed without the use of GV’s and with GV’s at 25% and 50% of the chord. For the geometric analysis, were used in the simulations the co-rotating and counter-rotating matrices, placed at 25% and 50% of the chord. Were also considered air at 25 °C, steady-state and wind speed rate of 3 m/s. A relative velocity was calculated to fit the simplifications used. As a result, there was increase in lift force, deflection, drag and rotation for 25% of the chord. As well as an increase in drag forces and a decrease in lift, rotation and deflection forces in cases to 50% of the chord. Therefore, it was verified that the GV's directly influence the flow, causing an increase of efficiency in the equipment in the condition a 25% of the chord and a reduction of efficiency in the condition of 50%.
Keywords
Vortex generators, wind turbine, Computational fluid dynamics (CFD), Turbulent flow
