Lift enhancement using a close-coupled oscillating canard.

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Author
Schmidt, Dean Christopher
Date
1992-09Advisor
Howard, Richard M.
Second Reader
Schmidt, Louis V.
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Show full item recordAbstract
A wind-tunnel study to investigate the effects of dynamic stall of a closecoupled
canard on the canard/wing vortex interaction for increased lift
enhancement was conducted. Two angles of attack of the model were studied:
one at the first stall condition of the wing and one in the post-stall regime where
a strong leading-edge vortex was formed. Baseline force and moment parameters
were measured at mean canard deflections based on those determined to be
optimum for the static case, as were mean values ± 3 degrees about the optimum.
The amplitude of oscillation considered was ± 5 degrees about each mean;
reduced frequencies tested were from 0.046 to 0.232. For most cases, lift was
enhanced beyond the static-canard case at mean deflections equal to those at or
greater than the static optimum value. The effective lift was decreased for mean
deflections less than those previously determined to be optimum. Lift
enhancements were generally 2 to 6 percent higher than the values determined
with the static canard. The increased lift was generally independent of reduced
frequency and peaked between k values of 0.1 to 0.2.
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