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Turbulent Spot Characteristics in Boundary Layers Subjected to Streamwise Pressure Gradient FREE

[+] Author Affiliations
Mark W. Johnson

The University of Liverpool, Liverpool, U.K.

Paper No. 98-GT-124, pp. V001T01A036; 8 pages
doi:10.1115/98-GT-124
From:
  • ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 1: Turbomachinery
  • Stockholm, Sweden, June 2–5, 1998
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7862-0
  • Copyright © 1998 by ASME

abstract

The development of linear perturbations within laminar boundary layers subjected to a full range of adverse and favourable pressure gradients has been predicted numerically. Comparison of the predictions with published flow visualisation results enabled identification of the perturbation regions associated with the turbulent spot, trailing vortex streaks and oblique waves along the spot flanks. The effect of streamwise pressure gradient on spot characteristics (spot leading and trailing edge velocity, calming region trailing edge velocity and spot spreading half angle) was determined and was found to be consistent with published experimental data. The new data extends the range to severe adverse pressure gradient (separation) and to stronger favourable gradients. Correlations for the spot characteristics are provided.

Copyright © 1998 by ASME
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