Off-Design Performance of a Single Stage Transonic Turbine PUBLIC ACCESS

[+] Author Affiliations
M. Woinowsky-Krieger, J.-P. Lavoie, E. P. Vlasic, S. H. Moustapha

Pratt & Whitney Canada, Inc., Montréal, Canada

Paper No. 98-GT-002, pp. V001T01A001; 9 pages
  • 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


This paper presents results of rig testing of a transonic, single stage turbine at off-design conditions. Mapping of the 3.4 pressure ratio, 1.9 stage loading turbine ranged from 70% through 120% of design speed and 75% to 125% of design pressure ratio. Results show expansion efficiency dropping over 4% from 100% to 80% of design speed at design pressure ratio, while remaining within half a percent from 90% to 110% of design pressure ratio at design speed. Efficiency lapse rate from equivalent sea-level to cruise altitude Reynolds numbers at the design point was measured and found to be worth over 1.5%. Analyses of test results using a viscous 3D solver showed very good agreement for the efficiency change with speed.

Copyright © 1998 by ASME
Topics: Design , Turbines
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