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System Matched 3D Radial Impeller Design With Variable Inlet Angle Distributions

[+] Author Affiliations
Matthias Semel, Henrik Smith, Philipp Epple, Oliver Litfin, Antonio Delgado

University of Erlangen-Nuremberg, Erlangen, Germany

Klaus Pfannschmidt, Detlev Grobeis

actiro GmbH & Co. KG, Suhl, Germany

Paper No. GT2012-70024, pp. 795-802; 8 pages
  • ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
  • Volume 3: Cycle Innovations; Education; Electric Power; Fans and Blowers; Industrial and Cogeneration
  • Copenhagen, Denmark, June 11–15, 2012
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4469-4
  • Copyright © 2012 by ASME


In vacuum cleaners radial impellers with high rotational speed are very often used. A high rotational speed is connected with a best efficiency point of the radial impeller at a high flow rate. This is contrary to the working point of the whole system. Thus there is need for a radial impeller designs having a high efficiency at low flow rates under the restriction of a high rotational speed. One important parameter connected to the hydraulic efficiency characteristics of the radial impeller is the blade inflow angle β1. In order to shift the best efficiency point towards lower flow rates radial impellers with double curved blades and a linear β1 distribution were designed and CFD simulations were done in order to investigate the effect of this approach. A linear variation of the inflow angle β1 enables the designer to shift the efficiency characteristics of the impeller towards lower flow rates with a gain in hydraulic efficiency and pressure increase.

Copyright © 2012 by ASME
Topics: Impellers , Design



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