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Experimental and Numerical Investigation of the Performance Instability in a Mixed-Flow Impeller

[+] Author Affiliations
Jens Friedrichs, Günter Kosyna

Technical University of Braunschweig, Braunschweig, Germany

Paper No. FEDSM2002-31326, pp. 283-290; 8 pages
doi:10.1115/FEDSM2002-31326
From:
  • ASME 2002 Joint U.S.-European Fluids Engineering Division Conference
  • Volume 1: Fora, Parts A and B
  • Montreal, Quebec, Canada, July 14–18, 2002
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3615-0 | eISBN: 0-7918-3600-2
  • Copyright © 2002 by ASME

abstract

This paper describes the recent investigations and results on performance and NPSH-instabilities of a mixed-flow impeller. Several techniques (experimental and numerical) were combined to explain the specific phenomena in the behaviour of impeller momentum-transfer (energy-transfer) under non-cavitating and cavitating conditions. Subject of the investigations was a shrouded impeller of medium specific speed (nq = 61) which shows a performance instability (hysteresis) described by two stable operating points and a NPSH3% -peak at the same particular flow rate. Blade pressure measurements in the rotating system as well as velocity measurements downstream of the impeller in combination with CFD-results were used to explain the differences in momentum-transfer leading to the unstable performance behaviour.

Copyright © 2002 by ASME

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