Articulo
Lift and drag coefficients behavior at low Reynolds number in an airfoil with miniflaps gurney submitted to a turbulent flow: part 2
Autor
Colman Lerner, Jorge León
Marañón Di Leo, Julio
Delnero, Juan Sebastián
Martínez, Mariano Álvaro
Boldes, Ulfilas
Bacchi, Federico
Institución
Resumen
Following the work performed in Part 1, new wind tunnel experiments were conducted in order to investigate the influence of different sizes of Gurney mini-flaps upon the aerodynamic behavior of a low Reynolds number airfoil HQ 17. The airfoil, with and without the Gurney mini-flaps, are immersed in a low Reynolds number turbulent flow. Lift and drag coefficients were calculated for the plain wing and for the wing with mini-flaps of 1%, 1.5%, 2% and 2.5% height of the chord and plotted as a function of the angle of attack (α). The experimental data, including the power density spectrum of the instantaneous longitudinal and vertical velocities and load, show that the Gurney mini-flap acts enhancing the lift coefficient of the airfoil coupled with an increased drag, primarily due to the particular mini-flaps wake structure. We also found that the airfoil performance, for the four mini-flaps tested, is almost independent of the scales of the incoming turbulence. Facultad de Ingeniería