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Preliminary Design of Axial Fans at Off-Design Working Points

[+] Author Affiliations
Matthias Semel, Julien Grilliat, Antonio Delgado

University of Erlangen-Nuremberg, Erlangen, Germany

Paper No. GT2014-26605, pp. V01AT10A025; 9 pages
doi:10.1115/GT2014-26605
From:
  • ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
  • Volume 1A: Aircraft Engine; Fans and Blowers
  • Düsseldorf, Germany, June 16–20, 2014
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4557-8
  • Copyright © 2014 by ASME

abstract

An analytical formulation for axial fan performances at and off design point is proposed for an arbitrary work distribution. It is shown that the total pressure, total-to-static pressure and hydraulic efficiency characteristics can be described by means of hyperbola, straight lines and parabola. This formulation is applied to axial fans with free vortex work distributions, allowing a theoretical study onto the influence of the hub-to-tip ratio. Theoretical predictions are compared with numerical simulations. Good qualitative agreements are found. Conclusions onto the best practice guidelines for the design of axial fan according to a free vortex work distributions are presented.

Copyright © 2014 by ASME
Topics: Design , Fans

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