An Experimental Investigation of System Effects in Axial Flow Compressors PUBLIC ACCESS

[+] Author Affiliations
Peter O. Silkowski

Pratt &. Whitney Aircraft Engines, East Hartford, CT

Hyoun-Woo Shin

GE Aircraft Engines, Cincinnati, OH

Paper No. 98-GT-593, pp. V001T01A141; 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


In this paper, experimental results are presented which demonstrate the potential importance of component coupling and system effects on the pumping stability and performance of a rotor in an axial flow compressor. Three different configurations are presented: (1) series coupling, (2) parallel coupling, and (3) combined series/parallel coupling. In all three configurations the more stable component or region successfully stabilizes the entire compression system beyond the stability boundary of the less stable component or region. A novel method for assessing the relative stability of the different regions is employed. This method utilizes the small scale pre-stall disturbances of the compressor to probe the stability of the different regions. The role of length scales or domains of dependence in determining stability is consistently demonstrated. Specifically, the stability of small length scale disturbances is shown to be governed by the local environment while being relatively insensitive to other components. However, the stability of larger length scale phenomena is affected by the global environment created by considering all of the parts of the overall system. Consideration and knowledge of these results is important when modeling, analyzing, or designing a compression system. Furthermore, these results serve as a cautionary note when interpreting solutions from a simplified analytical/computational analysis.

Copyright © 1998 by ASME
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