Equation (1.25)therefore is of fundamental significance for understanding the origin of lift forceson air foils or on turbo machine blades. Hydrodynamic lift is frequently describedas a circulation superimposed on a parallel flow according to the law of Kutta-Joukowskywhere inviscid flow is assumed. This approach may be of service for the mathematical treatment. However, the physical meaning is less obvious, since thecirculation cannot be measured in reality
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