A parametric study of laminar and transitional oblique shock wave reflections

A parametric study of laminar and transitional oblique shock wave reflections

Giepman, R.H.M. (TU Delft Aerodynamics)
Schrijer, F.F.J. (TU Delft Aerodynamics)
van Oudheusden, B.W. (TU Delft Aerodynamics)

2018-06-10

High-resolution particle image velocimetry measurements were performed on laminar and transitional oblique shock wave reflections for a range of Mach numbers (M D 1:6-2:3), Reynolds numbers (Re_xsh D 1.4×10⁶-3.5×10⁶) and flow deflection angles (θ 1°-5° or p3=p1 D 1.11-1.64). The laminar interactions revealed a long, flat and triangular shaped separation bubble. For relatively strong interactions (p3=p1 > 1.2), the bubble grows linearly in the upstream direction with increasing shock strength. Under these conditions, the boundary layer keeps an on average laminar velocity profile up to the shock impingement location, followed by a quick transition and subsequent reattachment of the boundary layer. For weaker interactions (p3=p1 < 1.2), the boundary layer is able to remain laminar further downstream of the bubble, which consequently results in a later reattachment of the boundary layer. The pressure distribution at the interaction onset for all laminar cases shows excellent agreement with the free-interaction theory, therefore supporting its validity even for incipiently separated laminar oblique shock wave reflections.

Boundary layers
compressible flows
shock waves

http://resolver.tudelft.nl/uuid:a4867927-3151-4265-a0ad-b0f6559ad27b

https://doi.org/10.1017/jfm.2018.165

0022-1120

Journal of Fluid Mechanics, 844, 187-215

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Institutional Repository

journal article

© 2018 R.H.M. Giepman, F.F.J. Schrijer, B.W. van Oudheusden