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Thermophysics and Aeromechanics

2008 year, number 3

Investigation of separation properties of turbulent boundary layer at its sequential interaction with shocks of different strengths

M.A. Goldfeld1, YU.V. Zakharova2, N.N. Fedorova3
1 Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
2 Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
3 Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: boundary layer, shock wave, expansion wave, interaction, separation zone
Pages: 453-461

Abstract

The results are presented for numerical modelling of two-dimensional flows with large pressure gradients in a wide range of freestream parameters (М = 2−4, Re1 = 5−30⋅106 1/m) and the intensities of perturbing factors. Computations were performed with the use of averaged unsteady Navier - Stokes equations of a viscous heat-conducting gas. The structure of a turbulent boundary layer at its passage through a single shock and a system of shocks of different strengths, which lie at a fixed distance from one another, was investigated numerically. In the case of the boundary layer passage through a system of shocks, the influence of the first interaction on the structure and separation properties of the boundary layer behind the second shock was investigated. The presence of a preliminary shock was shown to improve the boundary layer capability to withstand separation ahead of the secondary interaction region.