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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

Daily,  J. W., and Nece,  R. E., 1960, “Chamber Dimension Effects on Induced Flow and Frictional Resistance of Enclosed Rotating Disks,” J. Basic Eng., 83, pp. 217–232.
Kurokawa, J., and Toyokura, T., 1972, “Study on Axial Thrust of Radial Flow Turbomachinery,” Proceedings, The Second International JSME Symposium-Fluid Machinery and Fluidics, Tokyo, Japan, pp. 31–40.
Iino,  T., Sato,  H., and Miyashiro,  H., 1980, “Hydraulic Axial Thrust in Multistage Centrifugal Pumps,” ASME J. Fluids Eng., 102, pp. 64–69.
Thomae,  H., and Stucki,  R., 1970, “Axial Thrust Occurring in Multistage Radial Pumps,” Sulzer Technical Review.
EPRI Report TR-102102, 1993, “Feedpump Operation and Design Guidelines,” Electric Power Research Institute, Palo Alto, CA, pp. 1/35–1/46.
Senoo,  Y., and Hayami,  H., 1976, “An Analysis on the Flow in a Casing Induced by a Rotating Disk Using a Four-Layer Flow Model,” ASME J. Fluids Eng., 99, pp. 192–198.
Stepanoff, A. J., 1966, Centrifugal and Axial Flow Pumps, Wiley, New York.
Makay, E., and Barrett, J. A., 1984, “Changes in Hydraulic Component Geometries Greatly Increased Power Plant Availability and Reduced Maintenance Cost: Case Histories,” Proceedings, The First International Pump Symposium, Texas A&M University, College Station, Texas, pp. 85–97.
Gantar, M., Florjancic, D., and Sirok, B., 2001, “Changes in Hydraulic Component Geometries and its Influence on Axial Thrust in Multistage Pumps” (in German), Industriepumpen+Kompressoren, Vulkan Verlag, Essen, Germany.
Childs, D. W., Elrod, D., and Hale, K., 1988, Annular Honeycomb Seal Test Results for Leakage on Rotordynamic Coefficients; Comparison to Labyrinth and Smooth Configurations, ASME Paper 88-Trib-35, ASME/STLE (1988), Tribology Conference.

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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