Abstract
Applicability of the Kutta-Joukowski condition to the steady, two-dimensional, inviscid flow around an airfoil with a sharp trailing edge has been well established experimentally as well as theoretically. It says at the trailing edge that: (1) the pressure is continuous, that is, there is no tail loading, (2) the departing velocities from both sides are the same, that is, there is no vorticity shedding, (3) the departing stream line bisects the trailing edge angle. This flow model is also applicable to the medium for high Reynolds number flow around a thin airfoil with a sharp trailing edge and with no separation zone, if one accounts for the displacement thickness of the boundary layer along the airfoil surface and applies one of these conditions (usually condition (3)) at this modified body surface. This concept is called the global Kutta condition. This outer potential flow is calculated and gives physically plausible flow characteristics.
Published Version
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