

CONTROL OF SUPERSONIC BOUNDARY LAYER PARAMETERS BY BLOWING FOREIGN GAS
Gaponov S.A., Smorodskiy B.V.
Khristianovich Institute Of Theoretical And Applied Mechanics SB RAS, Novosibirsk, Russia
Citation:
Gaponov, S.A. and Smorodskiy, B.V., (2015) Control of supersonic boundary layer parameters by blowing foreign gas, Modern Science: Researches, Ideas, Results, Technologies, Iss. #1(16), PP. 28  32.

Keywords: boundary layer; heat transfer; stability; binary mixtures; laminarturbulent transition; compressible gas; gas injection; surface friction 
Abstracts:
In this paper the properties of the compressible boundary layer of binary mixtures were studied on the base of binary gas mixtures boundary layer equations in a local selfsimilar approximation. Velocities, densities and temperatures profiles were calculated at Mach numbers 0.7 and 2. It turned out that the heavy gas blowing action is analogous to the cooling surface and should lead to the boundary layer stability growth and the laminarturbulent transition delay. It was obtained data on the blowing influence on the surface friction and heat transfer coefficients. It has been shown that the impurities blowing intensity increase leads to the monotonous reduce of surface friction and the heat transfer values on a wall. The light gas is a more efficient cooler of a surface. Data about the behavior of the generalized inflection point depending on the parameters of the injection were calculated. The heavy gas injection shifted the point inflection in the direction of the plate surface, while inflow of light gas influenced on the point inflection position by the reverse way. On this basis it was concluded that a boundary layer stabilization is possible by blowing of the gas with high molecular weight. This work is the basis for the projected accurate calculations of the linear boundary layer stability of binary gas mixtures. 
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