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ADDITIONAL TECHNICAL PAPERS

Effect of Swirl on Rotordynamic Forces Caused by Front Shroud Pump Leakage

[+] Author and Article Information
Yun Hsu, Christopher E. Brennen

California Institute of Technology, Mail Code 104-44, Pasadena, CA 91125

J. Fluids Eng 124(4), 1005-1010 (Dec 04, 2002) (6 pages) doi:10.1115/1.1511164 History: Received August 17, 2001; Revised May 06, 2002; Online December 04, 2002
Copyright © 2002 by ASME
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References

Adkins,  D., and Brennen,  C. E., 1988, “Analysis of Hydrodynamic Radial Forces on Centrifugal Pump Impellers,” ASME J. Fluids Eng., 110, pp. 20–28.
Bolleter,  U., Wyss,  A., Welte,  I., and Sturchler,  R., 1987, “Measurement of Hydraulic Interaction Matrices of Boiler Feed Pump Impellers,” ASME J. Vib., Acoust., Stress, Reliab. Des., 109, pp. 144–151.
Jery, B., 1986, “Experimental Study of Unsteady Hydrodynamic Force Matrices on Whirling Centrifugal Pump Impellers,” Ph.D. thesis, California Institute of Technology, Pasadena, CA.
Guinzburg, A., 1992, “Rotordynamic Forces Generated By Discharge-to-Suction Leakage Flows in Centrifugal Pumps,” Ph.D. thesis, California Institute of Technology, Pasadena, CA.
Guinzburg,  A., Brennen,  C. E., Acosta,  A. J., and Caughey,  T., 1993, “The Effect of Inlet Swirl on the Rotordynamic Shroud Forces in a Centrifugal Pump,” ASME J. Eng. Gas Turbines Power, 115, pp. 287–293.
Uy,  R., and Brennen,  C. E., 1999, “Experimental Measurements of Rotordynamic Forces Caused by Front Shroud Pump Leakage,” ASME J. Fluids Eng., 121, pp. 633–637.
Sivo,  J., Acosta,  A. J., Brennen,  C. E., and Caughey,  T. K., 1995, “The Influence of Swirl Brakes on the Rotordynamic Forces Generated by Discharge-to-Suction Leakage Flows in Centrifugal Pumps,” ASME J. Fluids Eng., 117, pp. 104–108.
Tsujimoto,  Y., Yoshida,  Y., Ohashi,  H., and Ishizaki,  S., 1997, “Fluid Force Moment on a Centrifugal Impeller in Precessing Motion,” ASME J. Fluids Eng., 119, pp. 366–371.
Brennen, C. E., 1994, Hydrodynamics of Pumps, Concepts ETI and Oxford University Press, Oxford, UK.
Hsu, Y., 2001, “Rotordynamic Forces Generated by Annular Leakage Flows in Centrifugal Pumps,” Ph.D. thesis, California Institute of Technology, Pasadena, CA.

Figures

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Typical nondimensional data for Fn and Ft from the current experiments as functions of the whirl frequency ratio Ω/ω (data for contoured rotor with inlet swirl at ϕ=0.043)
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Schematic of the experimental facility showing the rotor and stator assembly (left), the α=6 deg inlet guide vanes (right) and the location of the Pitot tubes
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Comparison of the experimental measurements (×) of the pressure coefficient (Cp) profiles in the leakage path for ϕ=0.043, 0.054, and 0.065 with the calculated profiles for inlet swirl ratios of 0, 0.27, 0.4, and 0.5
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Experimental inlet swirl ratio versus flow coefficient ϕ, with 6-deg inlet swirl vanes at 500 rpm(⋄ ), 1000 rpm(□ ), with 2-deg swirl vanes at 500 rpm(▵ ), 1000 rpm(○ ), and with radial vanes at 1400 rpm(× ) and 1000 rpm(* )
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Experimental rotordynamic coefficients for the contoured rotor plotted against flow coefficient, ϕ, for tests with inlet swirl, Γ=0.0(▵), 0.4 (+), 0.5 (×), 0.6 (○) and 0.7 (*) (presented by Uy and Brennen 6 and here shown to be inaccurate)
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Experimental rotordynamic coefficients for the contoured rotor plotted against flow coefficient, ϕ, for tests with inlet swirl, Γ=0.0,(○) and 0.26 (×)
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Experimental rotordynamic coefficients plotted against flow coefficient ϕ for tests with inlet swirl with the contoured rotor (□,Γ=0.27) and the conical rotor (×,Γ=0.27)
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Swirl reduction devices
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Rotordynamic coefficients plotted against flow coefficient for experiments with inlet swirl: no antiswirl devices (×), four full-length antiswirl ribs (○), four full-length antiswirl grooves (+).
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Schematic of the fluid-induced forces acting on an impeller whirling in a circular orbit

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