Dependence between the shock and the separation bubble in a shock wave boundary layer interaction |
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Authors: | Jean-Francois Debiève Pierre Dupont |
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Institution: | 1. Institut Universitaire des Systèmes Thermiques Industriels, Université de Provence and UMR CNRS 6595, 13013, Marseille, France
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Abstract: | We present experimental results obtained in a turbulent boundary layer at a Mach number of 2.3 impinged by an oblique shock
wave. Strong unsteadiness is developed in the interaction, involving several frequency ranges which can extend over two orders
of magnitude. In this paper, attention is focused on the links between the low-frequency shock motions and the separation
bubble, in particular phase relationships are evaluated. An interpretation based on a simple scheme of the streamwise evolution
of the instantaneous pressure is proposed. As it is mainly based on the pressure signal properties inside the region of the
shock oscillation, it may be expected that it will still be relevant for different configurations of shock-induced separation
as compression ramp, blunt bodies, or over expanded nozzles. |
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