A method for separating shock wave motion and turbulence in LDV measurements

C. W. Palko, J. C. Duttont

Research output: Contribution to conferencePaperpeer-review


Two-component laser Doppler velocimetry (LDV) measurements were made in a planar, twodimensional flow containing an unsteady oblique shock wave formed by the convergence of two supersonic streams past a thick plate. Wall pressure measurements have been used to locate the shock wave and consequently separate the shock wave motion from the turbulence fluctuations in the LDV measurements of the shock-separated free shear layer. The primary result of isolating the large-scale changes in the position of the shock from the turbulence is a reduction in the experimental scatter rather than significant changes in the shape or magnitudes of the turbulent stress profiles. The overall effects of the changes in shock position on the turbulence were found to be small and do not significantly change the overall trends in the turbulence data. Velocity data were also analyzed to determine the effect of changes in the direction of shock motion rather than shock position. Shock motion direction was found to have a greater effect on the turbulence measurements than shock position. Like changes in the shock position, changes in the direction of shock motion did not significantly change the mean velocity. However, changes in the direction of the shock motion may either increase or decrease the turbulent stresses depending on the portion of the shear layer in question.

Original languageEnglish (US)
StatePublished - 1997
Event28th Fluid Dynamics Conference, 1997 - Snowmass Village, United States
Duration: Jun 29 1997Jul 2 1997


Other28th Fluid Dynamics Conference, 1997
Country/TerritoryUnited States
CitySnowmass Village

ASJC Scopus subject areas

  • General Engineering


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