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Partially Vaned Diffuser With Variable Cross-Section for Centrifugal Fans

[+] Author Affiliations
Tore Fischer, Joerg R. Seume

Leibniz Universität Hannover, Hannover, Germany

Sebastian Burgmann

Bergische Universität Wuppertal, Wuppertal, Germany

Manuel Rudersdorf

Fuel Cell Research Centre ZBT GmbH, Duisburg, Germany

Paper No. GT2017-63965, pp. V001T09A006; 13 pages
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 1: Aircraft Engine; Fans and Blowers; Marine; Honors and Awards
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5077-0
  • Copyright © 2017 by ASME


The present research focuses on the efficiency improvement at part-load of a centrifugal fan for a 30 kW fuel cell combined heat and power (CHP) unit. For this purpose, the fan stage is equipped with a partially vaned diffuser with a variable cross-sectional area using a moving backplate.

The design and the performance of the partially vaned diffuser with a variable cross-sectional area are described in the first part of this paper. The performance results are compared to measurements of the same centrifugal fan with a vaneless diffuser carried out for the previous investigation. For the second part, the influence of the variable cross-sectional area on the diffuser flow field is investigated using optical PIV (Particle Image Velocimetry) measurements and CFD (Computational Fluid Dynamics) simulations.

The combination of a variable cross-section, partially vaned diffuser was able to achieve a 10 percent increase in pressure ratio, a 5 percentage points increase in part-load efficiency while maintaining the whole operating range of the vaneless, constant cross section reference design.

Copyright © 2017 by ASME
Topics: Diffusers , Fans



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