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Predicting Engine Whirl Instability Via Equivalent 2D Mechanisms

[+] Author Affiliations
Nicholas Klompas

Consultant, Waterford, NY

Paper No. GT2002-30422, pp. 925-932; 8 pages
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2002, Parts A and B
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3609-6 | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME


Analysis to predict whirl instability of a whole engine, including flexible bladed disks, due to both linear and nonlinear destabilizing mechanisms at any speed, not only the critical, is advanced. The basis is the previously published, and now extended, equivalent two-dimensional mechanism (E2dM). Proven through physical logic are the principles: (1) a deflection or slope with a phase angle greater than 90 deg lead in response to an external disturbing force or moment respectively signals instability; (2) response of a system absorbing energy is modulated at speeds below onset of instability. Tactics to exploit these principles through fundamental analyses of response are devised.

Copyright © 2002 by ASME
Topics: Engines , Whirls , Mechanisms



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