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TECHNICAL PAPERS

A Model for Squeeze Film Dampers Operating With Air Entrainment and Validation With Experiments

[+] Author and Article Information
Sergio Diaz

Universidad Simón Bolı́var, Venezuela

Luis San Andrés

Texas A&M University, College Station, TX 77843-3123

J. Tribol 123(1), 125-133 (Sep 19, 2000) (9 pages) doi:10.1115/1.1330742 History: Received February 14, 2000; Revised September 19, 2000
Copyright © 2001 by ASME
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References

Childs, D., 1993, Turbomachinery Rotordynamics, Wiley, New York.
Walton,  J., Walowit,  E., Zorzi,  E., and Schrand,  J., 1987, “Experimental Observation of Cavitating Squeeze Film Dampers,” ASME J. Tribol., 109, pp. 290–295.
Zeidan,  F. Y., and Vance,  J. M., 1989, “Cavitation Leading to a Two Phase Fluid in a Squeeze Film Damper,” STLE Tribol. Trans., 32, pp. 100–104.
Zeidan,  F. Y., and Vance,  J. M., 1990, “A Density Correlation for a Two-Phase Lubricant and Its Effect on the Pressure Distribution,” STLE Tribol. Trans., 33, pp. 641–647.
Zeidan, F. Y., Vance, J. M., and San Andrés, L. A., 1996 “Design and Application of Squeeze Film Dampers in Rotating Machinery,” Proceedings of the 25th Turbomachinery Symposium, Texas A&M University, College Station, TX, pp. 169–188.
Vance, J. M., 1988, Rotordynamics of Turbomachinery, Wiley, New York.
Braun,  M. J., and Hendricks,  R. C., 1984, “An Experimental Investigation of the Vaporous/Gaseous Cavity Characteristics of an Eccentric Journal Bearing,” ASLE Trans., 27, pp. 1–14.
Ku,  C. P., and Tichy,  J. A., 1990, “An Experimental and Theoretical Study of Cavitation in a Finite Submerged Squeeze Film Damper,” ASME J. Tribol., 112, pp. 725–733.
Diaz, S. E., and San Andrés, L. A., 1999, “Air Entrainment versus Lubricant Vaporization in Squeeze Film Dampers,” ASME Paper 99-GT-187.
Zeidan,  F. Y., and Vance,  J. M., 1990, “Cavitation Regimes in Squeeze Film Dampers and Their Effect on the Pressure Distribution,” STLE Tribol. Trans., 33, pp. 447–453.
Hibner, D., and Bansal, P., 1979, “Effects of Fluid Compressibility on Viscous Damper Characteristics,” Proceedings of the Conference on the Stability and Dynamic Response of Rotors with Squeeze Film Bearings, University of Virginia, pp. 116–132.
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Sun,  D. C., Brewe,  D. E., and Abel,  P. B., 1993, “Simultaneous Pressure Measurement and High-Speed Photography Study of Cavitation in a Dynamically Loaded Journal Bearing,” ASME J. Tribol., 115, pp. 88–95.
Szeri,  A. Z., 1996, “On the Flow of Emulsions in Tribological Contacts,” Wear, 200, pp. 353–364.
Chamniprasart,  K., Al-Sharif,  A., Rajagopal,  K. R., and Szeri,  A. Z., 1993, “Lubrication with Binary Mixtures: Bubbly Oil,” ASME J. Tribol., 115, pp. 253–260.
Diaz,  S. E., and San Andrés,  L. A., 1998, “Measurements of Pressure in a Squeeze Film Damper with an Air/Oil Bubbly Mixture,” STLE Tribol. Trans., 41, pp. 282–288.
Diaz, S. E., and San Andrés, L. A., 1998, “Effects of Bubbly Flow on the Dynamic Pressure Fields of a Test Squeeze Film Damper,” ASME Paper FEDSM98-5070, Proceedings of the 1998 ASME Fluids Engineering Division Summer Meeting, Washington, DC, June.
Diaz,  S. E., and San Andrés,  L. A., 1999, “Reduction of the Dynamic Load Capacity in a Squeeze Film Damper Operating with a Bubbly Lubricant,” ASME J. Eng. Gas Turbines Power, 121, pp. 703–709.
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Tao,  L., Diaz,  S. E., San Andrés,  L. A., and Rajagopal,  K. R., 2000, “Analysis of Squeeze Film Dampers Operating With Bubbly Lubricants,” ASME J. Tribol., 122, pp. 205–210.
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Diaz, S. E., 1999, “The Effect of Air Entrapment on the Performance of Squeeze Film Dampers: Experiments and Analysis,” Ph.D. dissertation, Texas A&M University, College Station, TX.
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Figures

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Predicted radial and tangential forces versus oil through flow rate for operation at 8.33 Hz with one open and to ambient at the axial plane Z2. (See Fig. 2 for definition of forces.)
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Reference mixture volume fraction versus whirl frequency for operation with one open end to ambient (air) and oil through flow rate equal to 1.2 liter/min (1 estimated from measured pressures)
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Peak-to-peak pressure versus whirl frequency for operation with one open end to ambient (air) and oil through flow rate equal to 1.2 liter/min. Axial plane Z2.
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Peak-to-peak film pressure versus oil flow rate for open and to ambient operation at 8.33 Hz
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Reference mixture volume fraction versus oil through flow rate for operation at 8.33 Hz with one open end to ambient (1 estimated from measured pressure waves)
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Averaged extent of the uniform pressure zone (A/T) versus the mixture volume fraction for whirl frequencies of 8.33 and 16.67 Hz. Experiments and empirical formulas.
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Average air volume fraction versus feed-squeeze flow parameter (γ)
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Control volume in a squeeze film
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Predicted and experimental hydrodynamic forces (radial and tangential) for a whirl frequency of 8.33 Hz at the axial location Z2, including experimental uncertainty. (See Fig. 2 for definition of forces.)
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Predicted and experimental peak-to-peak pressure amplitude for a whirl frequency of 8.33 Hz versus the mixture volume fraction at axial location Z2
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Development of the predicted pressure fields with the mixture volume fraction for a whirl frequency of 8.33 Hz at axial plane Z2 (uniform pressure zone identified from test results)
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Squeeze film damper: geometry, coordinates, and film forces
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Squeeze film damper test section
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Total force per unit length versus whirl frequency for operation with one open end to ambient (air) and oil through flow rate equal to 1.2 liter/min. (See Fig. 2 for definition of forces.)

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