Abstract
Theoretical investigation of the linear stability of the flat-plate binary-mixture compressible boundary-layer at free-stream Mach number M=3 has been performed. It was assumed that foreign gases of various molecular mass have been introduced in the boundary layer of air through the permeable surface. It is found that weak distributed injection of a lighter gas destabilizes the flow. It is established that action of a heavy gas injection on the boundary-layer is similar to the action of wall cooling and leads to an increase of boundary-layer stability and to laminar-turbulent transition delay. Estimate of the influence of injection on the position of transition by means of the known eN-method has been performed. Principal possibility to double the transition Reynolds number by means of a heavy gas injection has been revealed.
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