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.
Experimental and Numerical Investigation of the Performance Instability in a Mixed-Flow Impeller
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Friedrichs, J, & Kosyna, G. "Experimental and Numerical Investigation of the Performance Instability in a Mixed-Flow Impeller." Proceedings of the ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. Volume 1: Fora, Parts A and B. Montreal, Quebec, Canada. July 14–18, 2002. pp. 283-290. ASME. https://doi.org/10.1115/FEDSM2002-31326
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