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AUTHOR(S):

Sergey A. Gaponov, Boris V. Smorodsky

 

TITLE

Control of Supersonic Boundary Layer and its Stability by Means of Foreign Gas Injection Through the Porous Wall

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KEYWORDS

compressible boundary-layer, binary-mixture, laminar-turbulent transition, hydrodynamic stabil-ity

ABSTRACT

Properties of binary-mixture compressible boundary layers have been investigated by means of the self-similar boundary-layer equations. Mach=2 boundary-layer velocity, density, temperature and concentration profiles have been computed. It was established that action of heavy gas injection on the boundary-layer is sim-ilar to the action of wall cooling and leads to an increase of boundary-layer stability and to the delay of the lam-inar-turbulent transition (LTT). Influence of a foreign gas injection on skin friction and heat transfer coeffi-cients has been investigated. It has been found that increase of foreign gas injection leads to the monotonous reduction of surface friction and heat transfer. Linear stability of Mach=2 boundary-layer has been investigated by means of the linear stability theory (LST). It has been established that injection of a heavy gas leads to the reduction of disturbance amplification rates. A prin-cipal possibility to enlarge the transition Reynolds numbers in approximately two times has been found.

Cite this paper

Sergey A. Gaponov, Boris V. Smorodsky. (2016) Control of Supersonic Boundary Layer and its Stability by Means of Foreign Gas Injection Through the Porous Wall. International Journal of Theoretical and Applied Mechanics, 1, 97-103

 

 

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