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TECHNICAL PAPERS

Bulk-Flow Analysis of Hybrid Thrust Bearings for Process Fluid Applications

[+] Author and Article Information
Luis San Andrés

Mechanical Engineering Department, Texas A&M University, College Station, TX 77843-3123 e-mail: LsanAndres@Mengr.tamu.edu

J. Tribol 122(1), 170-180 (Jun 10, 1999) (11 pages) doi:10.1115/1.555340 History: Received January 12, 1999; Revised June 10, 1999
Copyright © 2000 by ASME
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References

San Andrés,  L., 1995, “Thermohydrodynamic Analysis of Fluid Film Bearings for Cryogenic Applications,” J. Propul. Power, 11, No. 5, pp. 964–972.
San Andrés,  L., 1994, “Dynamic Force Response of Spherical Hydrostatic Journal Bearings for Crygoenic Applications,” Tribol. Trans., 37, No. 3, pp. 463–470.
Ransom,  D., Li,  J., San Andrés,  L., and Vance,  J. M., 1999, “Experimental Force Coefficients for a Two-Bladed Labyrinth Seal and a Four-Pocket Damper Seal,” ASME J. Tribol., 121, No. 2, pp. 370–376.
Franchek,  N., Childs,  D., and San Andrés,  L., 1995, “Theoretical and Experimental Comparisons for Rotordynamic Coefficients of a High-Speed, High-Pressure, Orifice-Compensated Hybrid Bearings,” ASME J. Tribol., 117, No. 2, pp. 285–290.
Ransom, D., and San Andrés, L., 1998, “Identification of Force Coefficients from a Gas Annular Seal, Effect of Transition Flow Regime to Turbulence,” Proceedings of the STLE Annual Meetings, Detroit, MI, Paper No. 98-NP-5G-3.
Pinkus,  O., and Lund,  J. K., 1981, “Centrifugal Effects in Thrust Bearings Under Laminar Conditions,” ASME J. Lubr. Technol., 103, pp. 126–136.
Hashimoto,  H., 1989, “The Effects of Fluid Inertia Forces on the Static Characteristics of Sector-Shaped, High Speed Thrust Bearings in Turbulent Flow Regime,” ASME J. Tribol., 111, pp. 406–411.
Hashimoto,  H., 1990, “Performance Characteristic Analysis of Sector-Shaped Pad Thrust Bearings in Turbulent Inertial Flow Regime Under Three Types of Lubrication Conditions,” ASME J. Tribol., 112, pp. 477–485.
Hirs,  G. G., 1973, “A Bulk-Flow Theory for Turbulence in Lubricant Films,” ASME J. Lubr. Technol., 95, pp. 137–146.
McCarty, R. D., NBS Standard Reference Data Base 12, 1986, “Thermophysical Properties of Fluids, MIPROPS86,” National Bureau of Standards, Colorado.
San Andrés,  L., and Childs,  D., 1997, “Angled Injection—Hydrostatic Bearings, Analysis and Comparison to Test Results,” ASME J. Tribol., 119, No. 1, pp. 179–187.
San Andrés, L., 1998, “Bulk-Flow Analysis of Hybrid Thrust Bearings for Advanced Cryogenic Turbopumps,” Final Progress Report to NASA Marshall SFC, October, NASA, NAG8-1395.
Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, Hemisphere Publishing, McGraw-Hill.
Van Doormaal,  J. P., and Raithby,  G. D., 1984, “Enhancements of the SIMPLE Method for Predicting Incompressible Fluid Flows,” Numer. Heat Transfer., 7, pp. 147–163.
Yang,  Z., San Andrés,  L., and Childs,  D. W., 1994, “Dynamic Forces Performance of Annular Gas Seals at Off-Center Conditions,” Tribol. Trans., 37, No. 1, pp. 33–44.
Constantinescu,  V. N., 1962, “Analysis of Bearings Operating in the Turbulent Flow Regime,” ASME J. Lubr. Technol., 82, pp. 139–151.
Arauz,  G., and San Andrés,  L., 1998, “Analysis of Two Phase Flow in Cryogenic Damper Seals, I: Theoretical Model,” ASME J. Tribol., 120, pp. 221–227.

Figures

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Geometry of hydrostatic/hydrodynamic thrust bearing
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Description of bearing pad and tapered film thickness
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Staggered control volumes for integration of bulk-flow equations in polar coordinates (r,θ)
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Film clearance (C) versus thrust load (WZ) for refrigerant thrust bearing. (Effects of fluid inertia at film lands and recess edges.)
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Recess pressure ratio versus dimensionless thrust load (W̄Z) for refrigerant thrust bearing
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(a) Dimensionless bearing mass flow rate versus thrust load (W̄Z) for refrigerant thrust bearing. (b) Mass flow rates (dim.) through inner and outer radii versus thrust load (W̄Z) for refrigerant thrust bearing.
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Dimensionless axial stiffness (K̄ZZ) coefficient versus load (W̄Z) for refrigerant thrust bearing
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Dimensionless axial damping (C̄ZZ) coefficient versus load (W̄Z) for refrigerant thrust bearing
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Dimensionless axial inertia (M̄Z) coefficient versus load (W̄Z) for refrigerant thrust bearing
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Dimensionless drag torque (T̄o**) versus load (W̄Z) for refrigerant thrust bearing
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Maximum and minimum film (dimensionless) pressures versus recess pressure ratio for refrigerant thrust bearing
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Film Pressures from full inertia model. (a) pressure at recess diameter for Pratio=0.93, 0.58, 0.22, (b) pressure surface and contours for pratio=0.58.

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