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The Importance of Shroud Leakage Modelling in Multistage Turbine Flow Calculations

[+] Author Affiliations
Budimir Rosic, John D. Denton, Graham Pullan

University of Cambridge, Cambridge, UK

Paper No. GT2005-68459, pp. 561-570; 10 pages
doi:10.1115/GT2005-68459
From:
  • ASME Turbo Expo 2005: Power for Land, Sea, and Air
  • Volume 6: Turbo Expo 2005, Parts A and B
  • Reno, Nevada, USA, June 6–9, 2005
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4730-6 | eISBN: 0-7918-3754-8
  • Copyright © 2005 by ASME

abstract

Three-dimensional steady multistage calculations, using the mixing plane approach, are compared with experimental measurement in a low speed 3-stage model turbine. The comparisons are made with two levels of shroud seal clearance, one representative of a real turbine and one with minimal seal clearance and almost no shroud leakage. Three different calculations are compared. The first computes the main blade path with no modelling of shroud leakage. The second includes a simple model of shroud leakage using sources and sinks on the end-walls and the third is a multiblock calculation with all leakage paths and cavities computed. It is found that neglect of shroud leakage makes the computed velocity profiles and loss distributions significantly different to those measured. Simple modelling of shroud leakage gives some improvement but full calculation of the leakage flows and cavities is necessary to obtain good agreement between calculation and measurement.

Copyright © 2005 by ASME

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