13th European Conference on Turbomachinery Fluid dynamics & Thermodynamics

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Steffen Melzer - Ruhr-Universität Bochum
Stephan Schepeler - WILO SE
Jan Förster - KROHNE Messtechnik GmbH
Jochen Friderich - KROHNE Messtechnik GmbH
Tobias Kalkkuhl - WILO SE
Romuald Skoda - Ruhr-Universität Bochum


The stationary and transient characteristics of a single-blade and a two-blade pump de-signed for solid-laden fluids and clogging-prevention are experimentally analyzed in an open pump test rig with clear water. Both impellers are installed in the identical pump volute casing and driven by the same motor to allow direct comparison. Stationary characteristics are analyzed in terms of time-averaged head, flow rate and power consumption. The time-fluctuating head and wall pressure inside the volute are measured by piezoresistive pressure transducers. For the assessment of the time-fluctuating flow rate, a quasi-stationary electromagnetic flowmeter with increased sampling rate is used. For the two-blade pump, the pressure and flow rate fluctuations are significantly reduced and the efficiency is slightly higher over the entire operation range, compared to the single-blade pump. While the single-blade pump shows increasing pressure and flow rate fluctuations from part towards overload, the opposite trend is observed for the two-blade pump. The fluctuations of the flow rate are generally much smaller than the pressure fluctuations.


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