Stabilization of Tollmien Schlichting waves by means of roughness generated streaks

Authors: Talamelli, A., Fransson, J. H. M., Brandt, L.B., Cossu, C.
Document Type: Conference
Pubstate: Published
Journal: Proc. 18th AIDAA 2005
Year: 2005


The stabilization of Tollmien-Schlichting (TS) waves in a spanwise modulated Blasius boundary layer has been experimentally verified in the MTL wind tunnel at KTH. The alternating high and low speed streaks were created by regularly spaced cylindrical roughness elements mounted near the leading edge of the flat plate. It is shown that the larger the streak amplitude is the larger is the damping effect of the TS-waves, which is in agreement with recent theoretical works