Convection velocity in a supersonic turbulent boundary layer

Eric F. Spina, John E. Donovan, Alexander J. Smits

Research output: Contribution to conferencePaperpeer-review


This paper describes the measurement of convection velocities in a Mach 3 boundary layer using streamwise-separated hot wires. The broad-band convection velocity, determined from space-time correlations, is 0.9U across the entire outer region of the boundary layer. The convection velocity was decomposed into frequency components using cross-spectral techniques. These average results reveal that large-scale motions convect more rapidly than small-scale motions in the lower part of the boundary layer, but not in the outer part. Convection velocities were also calculated for individual large-scale structures by means of a conditional sampling technique. The resulting distribution indicates that the majority of the large-scale structures convect at nearly the same velocity. The similarity of the present results with previous measurements taken over a wide range of Reynolds numbers and Mach numbers suggests the existence of a 'universal' convection velocity profile.

Original languageEnglish (US)
StatePublished - Dec 1 1990
EventTwelfth Turbulence Symposium - Rolla, MS, USA
Duration: Sep 24 1990Sep 26 1990


OtherTwelfth Turbulence Symposium
CityRolla, MS, USA

All Science Journal Classification (ASJC) codes

  • General Engineering


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