2013 1(12)

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Pages:

117 - 122

Language:

RU

Ref.:

6


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2013_1(12)_20.pdf

 

 

CONTROL OF FLOW REGIME IN SUPERSONIC FLOW

Gaponov S.A., Terekhova N.M.

Khristianovich Institute Of Theoretical And Applied Mechanics SB RAS, Novosibirsk, Russia


Citation:

Gaponov S.A. Control of flow regime in supersonic flow / S.A. Gaponov, N.M. Terekhova // Modern Science: Researches, Ideas, Results, Technologies. - Dnepropetrovsk: SPIC "Triacon". - 2013. - Iss. #1(12). - PP. 117 - 122


Keywords:

supersonic boundary layer; hydrodynamic stability; laminar-turbulent transition


Abstracts:

In the linear approximation the influence of changing of dynamic and thermal boundary layers of compressible gas at the implementation of the various ways of the flow regimes control on the linear stability is considered. The analysis was applied to boundary layers at high supersonic speeds. We consider the following control methods – the external pressure gradient, the distributed mass transfer through a porous surface and the heat transfer in the form of heating or cooling the rigid streamlined surface. For M = 5.35 in the boundary layers can coexist disturbances of different nature - the vortex and acoustic. The contributing to the damping of the vortex modes factors are the negative external gradient, the suction and cooling, accompanied by the formation of a filled dynamic boundary layers. On the contrary, a positive gradient, a blowing and heating the thicken layers and destabilizing vortex disturbances. The acoustic waves react to changes of the average parameters in different ways - to external pressure gradient and mass transfer - unidirectional with vortex, and to heat exchange - in different directions. This is due to the formation opposite the thermal boundary layers. The paper discussed in detail the parameters characteristic of the boundary layers and disturbances. The curves of a neutral stability and a frequency cuts, giving an idea of the increment perturbations are given. The information patterns can establish what factors lead to delays of the laminar regime, and what - to acceleration of the turbulent.


References:

  1. Gaponov, S.A. and Maslov, A.A. (1980), Razvitie vozmushcheniy v szhimaemykh potorakh [The development of disturbances in compressible flows], Science, Novosibirsk, USSR.

  2. Boyko .A.V., Grek G.R., Dovgal' A.V. and Kozlov V.V. (1999). Vozniknovenie yurbulentnosti v pristennykh techeniykh [Turbulence in the near-wall flow], Science, Novosibirsk, Rossia.

  3. Gaponov, S.A. and Maslennikova, I.I. (1997), "Subharmonic instability of a supersonic boundary layer", Teplofizika i aerodinamika, Vol. 4, no. 1, pp.3-12.

  4. Gaponov, S.A. and Terekhova, N.M. (2010), "Stability and three-wave interaction of disturbances in supersonic boundary layer with cooling", Vestnik NGU. Seria: Fizika,. Vol. 5, no. 3, pp .52-62.

  5. Gaponov, S.A. and Terekhova, N.M. (2011), "The linear evolution and interaction of disturbances in the boundary layers of compressible gas-tight and porous surfaces with a heat transfer", Izvestia RAN, MZhG, no. 3. pp. 69-83.

  6. Gaponov, S.A. and Terekhova, N.M. (2012), "Stability and three-wave interaction of disturbances in supersonic boundary layer with heat transfer at the wall ", Teplofizika i aerodinamika,. Vol. 19, no. 2, pp.1-16.

 

 
     

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