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Sealing of a Shrouded Rotor-Stator System With Pre-Swirl Coolant FREE

[+] Author Affiliations
Z. B. El-Oun, P. H. Neller, A. B. Turner

University of Sussex, Brighton, E. Sussex, England

Paper No. 87-GT-72, pp. V001T01A021; 11 pages
doi:10.1115/87-GT-72
From:
  • ASME 1987 International Gas Turbine Conference and Exhibition
  • Volume 1: Turbomachinery
  • Anaheim, California, USA, May 31–June 4, 1987
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7923-8
  • Copyright © 1987 by ASME

abstract

This paper describes an experimental study of a modelled gas turbine rotor-stator system using both pre-swirled blade coolant and radially outward flowing disc coolant. A double mitred rim seal was used together with, for some tests, an inner seal below the pre-swirl nozzles and blade feed holes in the rotor which were situated at the same radius. Some flow visualization results are presented together with measurements of pressure distribution, internal flow distribution and the minimum seal flow necessary to prevent ‘mainstream’ gas ingress into the wheelspace. The experiments are described for a range of rotational speeds up to Reθ = 1.8 × 106 for various combinations of pre-swirl flow, disc coolant flow and ‘blade’ coolant flow. The pre-swirled coolant flow is shown to have little effect on the pressure distribution below the pre-swirl nozzles but a gas concentration sampling technique showed that considerable contamination of the pre-swirled coolant by the frictionally heated disc coolant can occur. A clear pressure inversion effect was observed when coolant was provided by the pre-swirl nozzles only, whereby the pressure under the rim seal increased with increasing rotational speed. Except for the lowest flow rates, blade coolant flow is shown to increase the sealing flow requirement, but to a very much reduced extent when disc coolant flow is used simultaneously. A non-linear relationship between minimum sealing flow and Reθ is produced when the blade cooling system is in operation.

Copyright © 1987 by ASME
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