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TECHNICAL PAPERS

Effects of Seal Geometry on Dynamic Impeller Fluid Forces and Moments

[+] Author and Article Information
Yoshiki Yoshida, Yoshinobu Tsujimoto, Goh Morimoto, Hiroki Nishida

Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan

Shigeki Morii

Mitsubishi Heavy Industries, Ltd., Yokohama R&D Center, 12 Nishikimachi, Nakaku, Yokohama, Kanagawa 231-8715, Japan

J. Fluids Eng 125(5), 786-795 (Oct 07, 2003) (10 pages) doi:10.1115/1.1598988 History: Received December 18, 2001; Revised April 09, 2003; Online October 07, 2003
Copyright © 2003 by ASME
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References

Jery, B., Acosta, A. J., Brennen, C. E., and Caughy, T. K., 1985, “Forces on Centrifugal Pump Impellers,” Proceedings of the 2nd International Pump Symposium, Houston, TX, pp. 21–32.
Bolleter,  U., Wyss,  A., Whelte,  I., and Sturchler,  R., 1987, “Measurement of Hydraulic Interaction Matrices of Boiler Feed Pump Impeller,” ASME J. Vib., Acoust., Stress, Reliab. Des., 109, pp. 144–151.
Ohashi, H., Sakurai, A., and Nishihama, J., 1988, “Influence of Impeller and Diffuser Geometries on the Lateral Fluid Forces of Whirling Centrifugal Impeller,” NASA CP. 3026, pp. 285–306.
Adkins,  D. R., and Brennen,  C. E., 1988, “Analyses of Hydraulic Radial Forces on Centrifugal Pump Impeller,” ASME J. Fluids Eng., 110, pp. 20–28.
Tsujimoto,  Y., Acosta,  A. J., and Brennen,  C. E., 1988, “Theoretical Study of Fluid Forces on Centrifugal Pump Impeller Rotating and Whirling in a Volute,” ASME J. Vib., Acoust., Stress, Reliab. Des., 110, pp. 263–269.
Tsujimoto, Y., Acosta, A. J., and Yoshida, Y., 1988B, “A Theoretical Study of Fluid Forces on Centrifugal Pump Impeller Rotating and Whirling in a Vaned Diffuser,” NASA CP. 3026, pp. 307–322.
Childs,  D. W., 1989, “Fluid Structure Interaction Forces at Pump-Impeller-Shroud Surfaces for Rotordynamic Calculation,” ASME J. Vib., Acoust., Stress, Reliab. Des., 109, pp. 144–151.
Guinzburg,  A., Brennen,  C. E., Acosta,  A. J., and Caughy,  T. K., 1994, “Experimental Results for the Rotordynamic Characteristics of Leakage Flow in Centrifugal Pump,” ASME J. Fluids Eng., 116, pp. 110–115.
Uy,  R. V., and Brennen,  C. E., 1999, “Experimental Measurements of Rotordynamic Forces Caused by Front Shroud Pump Leakage,” ASME J. Fluids Eng., 121, pp. 633–637.
Ohashi, H., Imai, H., Sakurai, A., and Nishihama, J., 1990, “Lateral Fluid Forces of Whirling Centrifugal Impellers With Various Geometries,” The 3rd Japan-China Joint Conference of Fluid Machinery, 11 , pp. 147–153.
Bently, D. E., and Goldman, P., 1998, “Destabilizing Effect of Aerodynamic Forces in Centrifugal Compressors,” Proceedings of the 7th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Honolulu HI, A , pp. 306–315.
Yoshida,  Y., Tsujimoto,  Y., Ishi,  N., Ohashi,  H., and Kano,  F., 1999, “The Rotordynamic Forces on an Open-Type Centrifugal Compressor Impeller in Whirling Motion,” ASME J. Fluids Eng., 121, pp. 259–265.
Bolleter, U., Leibundgut, E., Sturchler, R., and McCloskey, L., 1989, “Hydraulic Interaction and Excitation Forces of High Head Pump Impellers,” Proc. of the 3rd Joint ASCE/ASME Mechanical Conference, pp. 187–193.
Shoji,  H., and Ohashi,  H., 1987, “Lateral Fluid Forces on Whirling Centrifugal Impeller (1st Report: Theory),” ASME J. Fluids Eng., 109, pp. 94–99.
Shoji,  H., and Ohashi,  H., 1987, “Lateral Fluid Forces on Whirling Centrifugal Impeller (2nd Report: Experiment in Vaneless Diffuser),” ASME J. Fluids Eng., 109, pp. 100–106.
Tsujimoto, Y., and Acosta, A. J., 1987, “Theoretical Study of Impeller and/or Vaneless Diffuser Attributed Rotating Stall and Their Effects on Whirling Instability of Centrifugal Impeller,” Work Group on the Behavior of Hydraulic Machinery under Steady Oscillatory Conditions, Lille, France.
Tsujimoto,  Y., Yoshida,  Y., and Mori,  Y., 1994, “Study of Vaneless Diffuser Rotating Stall Based on Two-Dimensional Inviscid Flow Analysis,” ASME J. Fluids Eng., 118(1), pp. 123–127.

Figures

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Mechanism to produce the impeller whirling motion
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Cross section of the test facility (impeller, vaneless diffuser, and collector)
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Configuration of test seals, Seal A, B, and C
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Scheme showing the fluid-induced forces Fr and Ft, and force moments. Mr and Mt (ε: eccentricity, Ω: shaft rotational speed, ω: whirling speed, “O”: impeller center on the whirl orbit, (r,t): radial and tangential to the whirl orbit)
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Pressure performance of the test impeller (ε=0,ω/Ω=0). Pressure coefficient ψ at the collector, ψs at the diffuser inlet, and pressure fluctuation ΔCp1 at the diffuser inlet, versus flow coefficient ϕ (uncertainty in ψ, ψs±0.01, in ϕ±0.01).
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Spectral analyses of pressure fluctuations at the diffuser inlet P1 in case of Seal A, for ε=0 and ω/Ω=0 (uncertainty in ϕ±0.01)
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Dimensionless fluid force fr (○) and ft, (•) and fluid force moment mr (○) and mt (•) on the impeller with Seal A versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in fr,ft±0.3,mr,mt±0.3, in ω/Ω±0.002, in ϕ±0.01)
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Dimensionless fluid force fr (○) and ft, (•) and fluid force moment mr (○) and mt (•) on the impeller with Seal B versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in fr,ft±0.3,mr,mt±0.3, in ω/Ω±0.002, in ϕ±0.01)
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Dimensionless fluid force fr (○) and ft, (•) and fluid force moment mr (○) and mt (•) on the impeller with Seal C versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in fr,ft±0.3,mr,mt±0.3, in ω/Ω±0.002, in ϕ±0.01)
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Spectral analyses of the pressure fluctuations at the diffuser inlet P1 and the signal of force sensor for various flow rates in Seal A (ε=1.05 mm) (uncertainty in ω/Ω±0.002, in ϕ±0.01)
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Comparison of the dimensionless fluid force f (○) due to the whirl with the dimensionless fluid force fRS (×) due to the rotating stall for various flow rates, in Seal A (ε=1.05 mm) (uncertainty in f±0.3,fRS±0.3, in ω/Ω±0.002, in ϕ±0.01)
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Unsteady pressure pattern in the vaneless diffuser due to the rotating stall coupled with the whirl at ω/Ω=0.26 for ϕ=0.100 in Seal A and B (ε=1.05 mm) (uncertainty in ω/Ω±0.002, in ϕ±0.01)
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Comparison of the dimensionless fluid force fr and ft (○) directly measured by the force sensor with the dimensionless pressure force frp and ftp (×) estimated by the unsteady pressure at the impeller outlet, versus whirling speed ratio ω/Ω for ϕ=0.100, in Seal A, B, and C (ε=1.05 mm) (uncertainty in fr,ft±0.3,frp,ftp±0.5, in ω/Ω±0.002, in ϕ±0.01).

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