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TECHNICAL PAPERS

Hydraulic Axial Thrust in Multistage Pumps—Origins and Solutions

[+] Author and Article Information
Marjan Gantar

Turboinstitut, Rovsnikova 7, 1210 Ljubljana, Sloveniae-mail: marjan.gantar@turboinstitut.si

Dusan Florjancic, Brane Sirok

University of Ljubljana, Faculty for Mechanical Engineering, Askerceva c. 6, 1000 Ljubljana, Slovenia

J. Fluids Eng 124(2), 336-341 (May 28, 2002) (6 pages) doi:10.1115/1.1454110 History: Received April 12, 2001; Revised September 12, 2001; Online May 28, 2002
Copyright © 2002 by ASME
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References

Figures

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Multistage pump with barrel casing
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Testing arrangement, pump specific speed nq 22 (nsUSA 1135)
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Geometry of tested pump
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Dimensionless pump characteristics
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Static pressure distributions for different leakage flow conditions
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Static pressure distributions for different pump flow conditions
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Measured peripheral velocity component in the middle of impeller side chamber width
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Calculated velocity distributions by NFA at diameter ratio D/D2=0,63
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Comparison of calculated and measured static pressure distributions
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Relative fluid rotation in the impeller side chamber
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Execution of FRI, FRD and MRBwr on one stage test arrangement
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Effect of FRI on static pressure distribution
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Effect of FRD on static pressure distribution
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Schematic pressure distributions on back and front shroud-normal stage impeller
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Effect of modified pump design on hydraulic axial thrust of three-stage pump

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