Abstract
T study systematically examined the effect of leadingedge serrations, sound emitted from periodically spaced holes near the wing leading edge, and external sound upon the flow over two low-speed wings, one with camber (NACA 2412) and one without (NACA 0015). The main purpose of the study was to determine whether these techniques could be used to increase the lift coefficient of these wings. These techniques were all found to have a beneficial effect upon the aerodynamic properties of these airfoils. The first two techniques could be practically used to improve the low-speed lift and stall performance of light aircraft during takeoff and landing and could be used for stall/flutter suppression on rotor and propeller blades.
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