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Influence of the Blade Count Ratio on Aerodynamic Forcing: Part I—Highly Loaded Transonic Compressor

[+] Author Affiliations
Florian Fruth, Damian M. Vogt, María A. Mayorca, Torsten H. Fransson

Royal Institute of Technology, Stockholm, Sweden

Hans Mårtensson

Volvo Aero Corporation, Trollhättan, Sweden

Paper No. GT2010-22756, pp. 1221-1233; 13 pages
doi:10.1115/GT2010-22756
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 6: Structures and Dynamics, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4401-4 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

The influence of the Blade Count Ratio (BCR) on the aerodynamic forcing of a highly transonic compressor has been investigated. The focus has been put on the unsteady aerodynamics as well as mode excitability and thus High Cycle Fatigue (HCF) risk. A number of compressor stages were investigated that differed in blade count of the stator blade row. Time-resolved aerodynamic forcing results were acquired using a non-linear CFD approach. The results were decomposed into frequency content and combined with modal properties of the various components. It is found that the BCR is a key parameter to reduce generalized force and consequently vibratory HCF stresses. Furthermore a potential in avoiding and/or alleviating potential resonant crossings in the Campbell diagram is reported. The dependency of these aspects from BCR is largely non-linear and for the first time discussed in detail on the basis of a transonic compressor stage.

Copyright © 2010 by ASME
Topics: Compressors , Blades

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