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Betyaev S.K.,N E Zhukovskii Central Aerodynamic Institute
Journal of Engineering Physics and Thermophysics | Year: 2011

Unwanted regimes of boundary layer suction when organized vortex structures known from experience arise have been determined. To this end, we performed an inspection analysis of the three-scale problem of the flow past a perforated boundary on the assumption that the inner scale equal to the perforation period is small compared to the outer scale characterizing the global problem. An asymptotic classification of suction regimes is given. The classical boundary layer problem - moderate suction - has been investigated in detail. © 2011 Springer Science+Business Media, Inc.


Betyaev S.K.,N E Zhukovskii Central Aerodynamic Institute
Journal of Engineering Physics and Thermophysics | Year: 2011

The features of the gas flow in the working section of a transonic wind tunnel have been considered. On the basis of the method of joining asymptotic expansions and the theory of detached zones mathematical models of the flow are proposed. The flow over a perforation and transverse and longitudinal slots has been investigated. In the latter case, a nonstationary and a stationary analogy with a two-dimensional flow are stated. A deflector - a new device for reflecting shocks - is proposed. The problems are discussed. © 2011 Springer Science+Business Media, Inc.

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