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Comparison of Measurements on Axial Fans and Performance Prediction Using Common Scale-Up Methods at Part- and Overload

[+] Author Affiliations
Michael Hess, Peter F. Pelz

Technische Universität Darmstadt, Darmstadt, Germany

Paper No. FEDSM2009-78200, pp. 115-120; 6 pages
  • ASME 2009 Fluids Engineering Division Summer Meeting
  • Volume 2: Fora
  • Vail, Colorado, USA, August 2–6, 2009
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4373-4 | eISBN: 978-0-7918-3855-6
  • Copyright © 2009 by ASME


There is a need to reliably predict the performance (efficiency and total pressure rise) of axial fans from model tests not only at the design point but also at part- and overload. The commonly used scale-up formulae give satisfactorily results only near the design point where inertia losses are small in comparison with frictional losses. At part- and overload the inertia losses are dominant and the scale-up formulae so far used fail. This is shown by applying several common scale-up methods in comparison to measured values of two axial model fans with a diameter of 1000 mm respectively 250 mm at different rotational speeds, hence Reynolds-numbers. In addition efficiency split-up for axial fans is shown and compared to former measurements on pumps.

Copyright © 2009 by ASME
Topics: Measurement , Fans



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