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Theoretical Modelling of Relative Wall Motion Effects in Tip Leakage Flow FREE

[+] Author Affiliations
I. K. Nikolos, D. I. Douvikas, K. D. Papailiou

National Technical University of Athens, Athens, Greece

Paper No. 95-GT-088, pp. V001T01A017; 12 pages
doi:10.1115/95-GT-088
From:
  • ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • Houston, Texas, USA, June 5–8, 1995
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7878-1
  • Copyright © 1995 by ASME

abstract

The influence of relative wall motion in modifying the leakage flow through the tip clearance is investigated. A theoretical model is developed, in order to calculate the mass flow rate through the gap.

The physical mechanism by which relative wall motion affects the leakage flow is analyzed and the differences between the turbine and compressor case are identified. This model, being an extension of an already existing one, not taking into account relative wall motion, is incorporated into the tip clearance calculation procedure, already developed by the authors.

Theoretical results of the complete calculation procedure (secondary flow plus tip clearance model) are compared with experimental data, for the case of compressor and turbine cascades, as well as for the case of a single rotor. Good agreement between theory and experiment is obtained.

Copyright © 1995 by ASME
This article is only available in the PDF format.

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