Convection velocity in a supersonic turbulent boundary layer

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

Research output: Contribution to conferencePaper

Abstract

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)
PagesA21.1-A21.11
StatePublished - Dec 1 1990
EventTwelfth Turbulence Symposium - Rolla, MS, USA
Duration: Sep 24 1990Sep 26 1990

Other

OtherTwelfth Turbulence Symposium
CityRolla, MS, USA
Period9/24/909/26/90

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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  • Cite this

    Spina, E. F., Donovan, J. E., & Smits, A. J. (1990). Convection velocity in a supersonic turbulent boundary layer. A21.1-A21.11. Paper presented at Twelfth Turbulence Symposium, Rolla, MS, USA, .