Supersonic turbulent boundary layer with distributed positive air mass transfer through a permeable surface
V.I. Kornilov, A.S. Shmakov
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: experiments, control, supersonic turbulent boundary layer, mass transfer, perforation, friction
Abstract
The article presents the results of an experimental study of the efficiency of controlling a supersonic turbulent boundary layer on a flat surface using distributed positive air mass transfer through a finely perforated wall. The experiments were performed at a Mach number of 2 and a unit Reynolds number of 12.5 x 106 m-1. The mass transfer rate varied from 0 to 0.00941. A significant effect of mass transfer on the skin friction coefficient is demonstrated, with the reduction at the end of the active control region reaching more than 80% compared to the baseline value. It was found that with spontaneous mass transfer, achieved through the natural difference between barometric and static pressure in the working section of the wind tunnel, it is also possible to achieve a significant reduction in the skin friction coefficient, down to zero at the end of the control region.
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