CIRCULATION CONTROL BY MEANS OF TRAILING EDGE SUCTION AND THE CUSP EFFECT
PRINCETON UNIV NJ JAMES FORRESTAL RESEARCH CENTER
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A mathematical method is presented for predicting under limited conditions the performance of systems employing powered or automatically controlled flow singularities to produce a high lift without a corresponding change in attack angle. Wind-tunnel tests or systems utilizing suction at the trailing edge indicated that 1 the lift increases with increasing suction quantities up to a limiting value without an increase in attack angle 2 the limiting value is determined by the suction quantity required to remove the stagnation point from the upper surface to the trailing edge and 3 the lift obtained with an unflapped profile utilizing edge suction is strongly affected by slot width and trailing edge overhang, but not by upper surface slot shape. A means was devised to create and stabilize a vortex at a desired location. An important feature of the flow is the powerful manner in which the vortex affects the downwash pattern to produce a large circulation about a profile.
- Fluid Mechanics