Since the first flight of the Wright brothers, there has been considerable effort devoted to improving wing performance. This research introduces theoretical and experimental study of a new novel method, a so-called air- breathing device (ABD), that provides simultaneous drag reduction and enhancement of lift. The basic principle of this technique is to introduce a transverse groove in the solid upper surface of the airfoil and an airstream is injected into one side of the groove and then completely removed from the other side.
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