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A Model for the Transient Behavior of Vortex Amplifiers

[+] Author Affiliations
David May

Rolls-Royce Canada, Montreal, QC, Canada

John W. Chew

University of Surrey, Guildford, Surrey, UK

Paper No. GT2014-25092, pp. V05CT16A002; 13 pages
  • ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
  • Volume 5C: Heat Transfer
  • Düsseldorf, Germany, June 16–20, 2014
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4573-8
  • Copyright © 2014 by Rolls-Royce plc


Gas turbine air systems perform a critical function in cooling hot components and must be extremely robust. While modulation of these flows during engine operation would allow performance benefits use of mechanical valves with moving parts could compromise reliability. In order to explore use of vortex amplifiers in engine systems, some understanding of their transient behavior within the systems that contain them is required. The present paper considers the unsteady flow characteristics of a vortex amplifier, presenting a 1D transient model that is readily incorporated in engine air systems models. To the authors’ knowledge, until now the transient behavior of these devices has been reproduced using linear empirical models that rely on experimentally derived coefficients, rather than physics based modeling. In this paper a physics based, 1-D model is presented and evaluated. The ability of the model to reproduce the transient behavior of a vortex amplifier is demonstrated through comparison with the experimental results of Kitsios and Boucher [1].

Copyright © 2014 by Rolls-Royce plc



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