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Space and time organization in a shock-induced separated boundary layer

Published online by Cambridge University Press:  19 July 2006

P. DUPONT
Affiliation:
Institut Universitaire des Systèmes Thermiques Industriels, Université de Provence and UMR CNRS 6595, 5 rue Enrico Fermi 13, Marseille, Cedex 13, Francepierre.dupont@polytech.univ-mrs.fr
C. HADDAD
Affiliation:
Institut Universitaire des Systèmes Thermiques Industriels, Université de Provence and UMR CNRS 6595, 5 rue Enrico Fermi 13, Marseille, Cedex 13, Francepierre.dupont@polytech.univ-mrs.fr
J. F. DEBIÈVE
Affiliation:
Institut Universitaire des Systèmes Thermiques Industriels, Université de Provence and UMR CNRS 6595, 5 rue Enrico Fermi 13, Marseille, Cedex 13, Francepierre.dupont@polytech.univ-mrs.fr

Abstract

The interaction of an oblique shock wave impinging on a turbulent boundary layer at Mach number 2.3 is experimentally investigated for a wide range of shock intensities. Characteristic time and length scales of the unsteady reflected shock and inside the downstream interaction region are obtained and compared with already existing results obtained in compression ramp experiments as well as in subsonic detached flows. Dimensionless characteristic frequencies are highlighted to characterize low-frequency shock unsteadiness as well as the different large scales which develop inside the initial part of the interaction. The possibility of describing the spatial development of the large scales inside the interaction zone using a mixing-layer scheme including compressibility effects is tested for a wide range of Mach numbers, shock intensities and geometrical configurations. Moreover, strong evidence of a statistical link between low-frequency shock movements and the downstream interaction is given. Finally, the downstream evolution of the structures shed into the boundary layer is characterized and shows features specific of our configuration.

Type
Papers
Copyright
© 2006 Cambridge University Press

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