Close-coupled oscillating canard effects on post-stall lift enhancement

Abstract

The effects of an oscillating close-coupled canard on the canard/wing vortex interaction for increased lift enhancement were studied. Two test conditions were studied: the first with a model angle of attack of 22 deg. and the second of 34 deg. The canard was positioned at three mean deflection angles equal to 4, 7 and 10 deg. for the model angle of attack of 22 deg. and -4, -7 and -10 deg. for the model angle of attack of 34 deg. At each of the canard mean deflection angles, the canard was oscillated with amplitudes of +/- 5 deg. and +/- 10 deg. with reduced frequencies ranging from 0.046 to 0.232. Because of the small effects noted which were of the order of accuracy of the balance, only general trends are discussed. The trends indicate that for this particular model configuration and geometry, lift was decreased slightly with increasing canard frequency and amplitude. No lift-enhancement benefits were revealed during the study.