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Research Papers: Flows in Complex Systems

A Single-Stage Centripetal Pump—Design Features and an Investigation of the Operating Characteristics

[+] Author and Article Information
Mihael Sekavčnik

Department of Energy Engineering, Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, Sloveniamihael.sekavcnik@fs.uni-lj.si

Tine Gantar

 Envita d.o.o., Trzaska 132, SI-1000 Ljubljana, Sloveniatine.gantar@envita.si

Mitja Mori

Department of Energy Engineering, Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, Sloveniamitja.mori@fs.uni-lj.si

J. Fluids Eng 132(2), 021106 (Feb 16, 2010) (10 pages) doi:10.1115/1.4000846 History: Received May 27, 2009; Revised December 11, 2009; Published February 16, 2010; Online February 16, 2010

In this paper, we present an experimental and numerical investigation of a single-stage centripetal pump (SSCP). This SSCP is designed to operate in the pump regime, while forcing the working media through impeller-stator flow channels in the radial inward direction. The measured performance curves are characterized by a hysteresis, since the throttle-closing performance curves do not correspond to the throttle-opening performance curves throughout the whole operating range. A computational fluid dynamics (CFD) model was developed to establish these throttle-closing and throttle-opening performance curves. The flow conditions obtained with the CFD simulations confirm that the hydraulic behavior of the SSCP is influenced by the partial circumferential stall that occurs in the impeller-stator flow channels. It was shown that the inflow conditions to the impeller-stator assembly considerably influence the flow rate of the stall cessation, the size of the hysteresis, and the head generated during part-load operations.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

SSCP in cascade plane section

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Figure 3

Cross section of the SSCP in cascade and meridional plane

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Figure 4

Ground plan of the test rig

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Figure 5

Measured ψ−φ curves of the SSCP

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Figure 6

Comparison of measured and calculated ψ−φ curves of the SSCP

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Figure 7

Velocity vectors, midchannel, segmental approach, φ=0.26

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Figure 8

Velocity vectors, midchannel, full pitch-360 deg approach, φ=0.26

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Figure 9

Velocity vectors, midchannel detail, full pitch-360 deg approach, φ=0.26

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Figure 10

Comparison of measured and calculated λ−φ curves of the SSCP

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Figure 11

Comparison of measured and calculated η−φ curves of the SSCP

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Figure 12

Influence of inflow conditions on the ψ−φ curves of the SSCP

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Figure 1

Basic division of radial turbomachinery

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