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Experimental and Numerical Flow Analysis of Low-Speed Fans at Highly Loaded Windmilling Conditions

[+] Author Affiliations
Aurélie Ortolan

SAFRAN Technofan, Toulouse, France

Suk-Kee Courty-Audren, Nicolas Binder, Xavier Carbonneau

Université de Toulouse, Toulouse, France

Florent Challas

SAFRAN Technofan, Blagnac, France

Paper No. GT2016-56577, pp. V02AT37A015; 10 pages
doi:10.1115/GT2016-56577
From:
  • ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
  • Volume 2A: Turbomachinery
  • Seoul, South Korea, June 13–17, 2016
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4969-9
  • Copyright © 2016 by ASME

abstract

This paper aims for the analysis of experimental and numerical results of windmilling flow topologies far from freewheeling condition. Two fans were investigated: a baseline design and an innovative one meant to reach good performance in both compressor and turbine modes. Experiments are conducted with global and local characterizations to determine energy recovery potential and local loss mechanisms. The numerical study is carried out with mixing plane steady simulations, the results of which are in fair agreement with experimental data. The difference of local topology between freewheeling and highly loaded windmill demonstrates that classical deviation rules such as Carter’s are not well-suited to highly loaded windmilling flows. Finally, under certain conditions, the minor influence of the stator on the rotor topology indicates that non rotating elements can be considered as loss generators.

Copyright © 2016 by ASME
Topics: Flow (Dynamics) , Fans

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