03.3 - Basic Fluid Dynamics and Flow ControlON THE WAVE-CANCELLING NATURE OF BOUNDARY LAYER TRANSITION CONTROLK. Sasakič, P. MorraČ, A.V.G. Cavalierič, A. HanifiČ, D.S. HenningsonČ; čITA, Brazil ;ČKTH, Sweden This work deals with the feedforward active control of the velocity fluctuations over incompressible boundary layers. We propose an undestanding of the mechanisms behind flow control via a wave-cancellation scheme, obtained directly from the inversion of the frequency-domain transfer functions. A reduction of one order of magnitude in the velocity shear at the wall is obtained from this scheme. |