Characteristic scales for energetic eddies in turbulent supersonic boundary layers

Jean Paul Dussauge, Alexander J. Smits

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11 Scopus citations


Spectral measurements in zero pressure gradient boundary layers are used to show that the longitudinal scales of the energy-containing motions decrease significantly with Mach 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.

Original languageEnglish (US)
Pages (from-to)85-91
Number of pages7
JournalExperimental Thermal and Fluid Science
Issue number1
StatePublished - Jan 1997

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • Nuclear Energy and Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


  • Boundary layers
  • Compressible turbulence
  • Turbulence length scales


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