EXPERIMENTAL INVESTIGATION OF THE INFLUENCE OF THE SHAPE OF ICE OUTGROWTHS ON THE AERODYNAMIC CHARACTERISTICS OF THE WING

The results of experimental investigations of the aerodynamic characteristics of the wing of NACA 0012 profile subjected to icing are presented. The ice accreted to the leading edge was simulated by appendages. The form and roughness of the outgrowths corresponded to the icing regimes typical of the formation of a glassy ice. Experiments were carried out in a wide range al' angles of attack a = -4-18 degrees in an AT-4 low-speed wind tunnel of the Kharkov Aviation Institute on a wing of rectangular shape with elongation lambda = 5 at the Reynolds number Re = 0.67.10(6) and flow velocity V-infinity = 53 m/s. It is shown that in the cases considered, a change in the aerodynamic shape of the wing as a result of icing leads to a decrease in the lift force of the wing down to 50%, to a decrease in the angle of flow stalling to a value of alpha similar to 6 degrees, and to a considerable (several times) increase in the drag.