Patent ID: 8016567

Claim:
An airfoil, comprising: a pressure surface exposed to a stream of fluid; a suction surface exposed to the stream of fluid and susceptible to fluid separation; a passage extending from a passage intake end to a passage discharge end, the intake end having an intake opening penetrating the pressure surface for extracting fluid from the fluid stream, the discharge end having a discharge opening penetrating the suction surface upstream of a natural separation point and being configured to inject the extracted fluid into the fluid stream at a jet angle whose components include at least one of a nonzero streamwise angle in a range of about 45° to about 110° and a nonzero cross-stream angle; and said discharge opening penetrating the suction surface at a distance upstream of the separation point equal to no more than about 20% of an airfoil axial chord, and the discharge opening being chordwisely aft of the intake opening.