Design Studies of Transonic and STOL Airfoils with Active Diffusion Control.
Final rept. 19 Apr 73-19 Jun 74,
ADVANCED TECHNOLOGY CENTER INC DALLAS TEX
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Results of parametric design studies are presented for supercritical airfoils which employ active diffusion control. Efforts were concentrated on two basically different airfoil profiles. One type of airfoil has a 6 thickness to chord ratio and employs an antiseparation tailored contour ATC located in the forward, lower surface. This type of airfoil is considered to be a promising candidate for improving the transonic performance of combat aircraft. The second type of airfoil is 12 thick and has an ATC within the aft, upper surface. This type of wing section is applicable to transonic transports and is compatible with previous STOL designs which employ ATCs. Theoretical analyses indicate both airfoils have large values of the transonic cruise parameter, good transonic lift characteristics, and, in general, offer improved transonic performance.