Experimental study on the influence of the changein the velocity profile on stability of disturbances in the Blasius boundary layer
I.A. Sadovskii, M.M. Katasonov, V.V. Kozlov
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: laminar-turbulent transition, Blasius boundary layer, distributed action, Tollmien-Schlichting wave
Abstract
The influence of the change in the velocity profile on stability of the Tollmien-Schlichting waves in the Blasius boundary layer is studied experimentally. The experiment is performed with a flat plate model in a low-turbulence wind tunnel T-324 at the freestream velocity U∞ = 9 m/s. Hot-wire anemometry is applied for measurements. The results show that a distributed action on the Blasius boundary layer through a hydrodynamically smooth surface leads to attenuation of the amplitude of the naturally excited Tollmien-Schlichting wave almost by two orders of magnitude. This distributed action leads to changes in flow stability. The experimental results reveal that the distributed action is more effective than the action onto the flow through a slot, other conditions being identical.
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