

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. and Terekhova, N.M., (2013) Control of flow regime in supersonic flow, Modern Science: Researches, Ideas, Results, Technologies, Iss. #1(12), PP. 117  122.

Keywords: supersonic boundary layer; hydrodynamic stability; laminarturbulent 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:
Gaponov, S.A. and Maslov, A.A. (1980), Razvitie vozmushcheniy v szhimaemykh potorakh [The development of disturbances in compressible flows], Science, Novosibirsk, USSR.
Boyko .A.V., Grek G.R., Dovgal' A.V. and Kozlov V.V. (1999). Vozniknovenie yurbulentnosti v pristennykh techeniykh [Turbulence in the nearwall flow], Science, Novosibirsk, Rossia.
Gaponov, S.A. and Maslennikova, I.I. (1997), "Subharmonic instability of a supersonic boundary layer", Teplofizika i aerodinamika, Vol. 4, no. 1, pp.312.
Gaponov, S.A. and Terekhova, N.M. (2010), "Stability and threewave interaction of disturbances in supersonic boundary layer with cooling", Vestnik NGU. Seria: Fizika,. Vol. 5, no. 3, pp .5262.
Gaponov, S.A. and Terekhova, N.M. (2011), "The linear evolution and interaction of disturbances in the boundary layers of compressible gastight and porous surfaces with a heat transfer", Izvestia RAN, MZhG, no. 3. pp. 6983.
Gaponov, S.A. and Terekhova, N.M. (2012), "Stability and threewave interaction of disturbances in supersonic boundary layer with heat transfer at the wall ", Teplofizika i aerodinamika,. Vol. 19, no. 2, pp.116.


