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A Prediction Scheme for the Decay of a Turbomachine Blade Wake PUBLIC ACCESS

[+] Author Affiliations
P. Kool, Ch. Hirsch

Vrije Universiteit Brussel, Brussels, Belgium

Paper No. 82-GT-273, pp. V001T01A091; 12 pages
doi:10.1115/82-GT-273
From:
  • ASME 1982 International Gas Turbine Conference and Exhibit
  • Volume 1: Turbomachinery
  • London, England, April 18–22, 1982
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7956-6
  • Copyright © 1982 by ASME

abstract

The effect of a steamwise pressure gradient on the decay of a skewed turbomachinery wake is considered. These pressure gradients are generated by the overall radial equilibrium and by the blade boundary layer separation mechanism at the blade trailing edge. The existence of a separation bubble near this trailing edge is shown to exist and gives rise to a pressure rise in a free stagnation point. The ensuing downstream streamwise pressure gradient influences the decay rate of the wake and the transverse pressure gradient influences the momentum thickness. The streamwise velocity defect can be accurately predicted by taking this pressure gradient into account if a profile shape is assumed and with an eddy viscosity concept. The velocity defect of the axial and tangential velocity profiles can be derived from the streamwise velocity profile parameters.

Copyright © 1982 by ASME
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