Characteristic scales for energetic eddies in turbulent supersonic boundary layers

Spectral measurements in zero pressure gradient boundary layers are used to show that the longitudinal scales of the energy-containing motions decrease significantly with Mac number. For example, at a Mach number of 2.9, the scales decrease by about a factor of two compared with subsonic flows. The...

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Bibliographic Details
Published in:Experimental thermal and fluid science 1997, Vol.14 (1), p.85-91
Main Authors: Dussauge, Jean-Paul, Smits, Alexander J.
Format: Article
Language:English
Subjects:
Boundary layer and shear turbulence
boundary layers
Compressible flows
shock and detonation phenomena
compressible turbulence
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Physics
Supersonic and hypersonic flows
turbulence length scales
Turbulent flows, convection, and heat transfer
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Summary:Spectral measurements in zero pressure gradient boundary layers are used to show that the longitudinal scales of the energy-containing motions decrease significantly with Mac number. For example, at a Mach number of 2.9, the scales decrease by about a factor of two compared with subsonic flows. The spectral results are in good agreement with spatial correlation data obtained by using Rayleigh scattering. It is expected that these modifications in the scales are due to compressibility. A possible interpretation can be found in the generation of acoustic noise by supersonic boundary layers. The measurements at Mach 2.9 would then represent the first manifestation, in boundary layers, of compressibility effects on turbulence.
ISSN:0894-1777
1879-2286
DOI:10.1016/S0894-1777(96)00104-5