Characterization of an incipiently separated shock wave/turbulent boundary layer interaction

• Published in: Shock waves 2017-03, Vol.27 (2), p.153-168
• Main Authors: Schreyer, A.-M., Dussauge, J.-P., Krämer, E.
• Format: Article
• Language: English
• Subjects: Acoustics; Amplification; Atomic structure; Boundary layer; Boundary layer interaction; Condensed Matter Physics; Downstream effects; Engineering; Engineering Fluid Dynamics; Engineering Thermodynamics; Fluid dynamics; Fluid flow; Fluid mechanics; Fluid- and Aerodynamics; Flux density; Heat and Mass Transfer; Mach number; Mechanics; Original Article; Physics; Reynolds number; Shock wave interaction; Thermodynamics; Turbulence; Turbulent boundary layer; Two dimensional flow; Variation; Velocity
• ISSN: 0938-1287; 1432-2153
• DOI: 10.1007/s00193-016-0656-x

The turbulence structure in a shock wave/turbulent boundary layer interaction at incipient separation was investigated in order to get insight into turbulence generation and amplification mechanisms in such flow fields. The flow along a two-dimensional 11 . 5 ∘ compression corner was studied experimentally at a Mach number of M = 2.53 and with a momentum-thickness Reynolds number of Re θ = 5370 . From hot-wire boundary layer traverses and surface heat-flux density fluctuation measurements with the fast-response atomic layer thermopile, the turbulence structure and amplification was described. Space–time correlations of the mass-flux fluctuations across the boundary layer and the surface heat-flux density fluctuations were measured to further characterize the development of the turbulence structure across the interaction. The large-scale boundary layer structures are concealed by shock-related effects in the strongly disturbed shock-foot region. Shortly downstream, however, large-scale structures dominate the signal again, just as in the incoming flow. A mechanism explaining this behavior is suggested.