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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Air Entrainment Versus Lubricant Vaporization in Squeeze Film Dampers: An Experimental Assessment of Their Fundamental Differences

[+] Author and Article Information
S. E. Diaz, L. A. San Andrés

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

J. Eng. Gas Turbines Power 123(4), 871-877 (Oct 01, 1998) (7 pages) doi:10.1115/1.1383258 History: Received October 01, 1998; Received March 01, 1999
Copyright © 2001 by ASME
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References

Childs, D., 1993, Turbomachinery Rotordynamics, John Wiley and Sons, New York.
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,” John Wiley and Sons, 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, “Experimental Investigation of Cavitation Effects on The Squeeze Film Force Coefficients,” Rotating Machinery Dynamics, DE-Vol. 18-1, ASME, New York, pp. 237–242.
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.
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, No. 1, 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.
Zeidan,  F. Y., and Vance,  J. M., 1989, “Cavitation Leading to a Two Phase Fluid in a Squeeze Film Damper,” STLE Tribol. Trans., 32, No. 1, pp. 100–104.
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.
Zeidan,  F. Y., and Vance,  J. M., 1990c, “Cavitation and Air Entrainment Effects on the Response of Squeeze Film Supported Rotors,” ASME J. Tribol., 112, pp. 347–353.
Hibner, D., and Bansal, P., 1979, “Effects of Fluid Compressibility on Viscous Damper Characteristics,” Proc. Conf. on the Stability and Dynamic Response of Rotors with Squeeze Film Bearings. University of Virginia, Charlottesville, VA, pp. 116–132.
Dowson, D., Godet, M., and Taylor, C. M., 1974, eds, Cavitation and Related Phenomena in Lubrication, ImechE, London.
Jacobson,  B. O., and Hamrock,  B. J., 1983, “High-Speed Motion Picture Camera Experiments of Cavitation in Dynamically Loaded Journal Bearings,” ASME J. Tribol., 105, pp. 446–452.
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,” Trans. ASME, 115, pp. 88–95.
Diaz,  S. E., and San Andrés,  L., 1998, “Measurements of Pressure in a Squeeze Film Damper With an Air/Oil Bubbly Mixture,” STLE Tribol. Trans., 41, No. 2, pp. 282–288.
Diaz, S., and San Andrés, L., 1998b, “Reduction of the Dynamic Load Capacity in a Squeeze Film Damper Operating with a Bubbly Lubricant,” ASME Paper 98-GT-109.
Diaz, S., and San Andrés, L., 1998c, “Effects of Bubbly Flow on the Dynamic Pressure Fields of a Test Squeeze Film Damper,” ASME Paper FEDSM98-5070.
Moffat,  R. J., 1982, “Contributions to the Theory of Single-Sample Uncertainty Analysis,” ASME J. Fluid Eng., 104, pp. 250–260.
Tao, L., Diaz, S., San Andrés, L., and Rajagopal, K., 1998, “Flow Analysis of Squeeze Film Dampers Operating With Bubbly Lubricants,” TAMU Turbomachinery Research Consortium Progress Report, TRC-SFD-1-98, College Station, TX, May.
Diaz, S. E., 1999, “The Effect of Air Entrainment on the Forced Response of Squeeze Film Dampers: Experiments and Analysis,” Ph.D. dissertation, Mechanical Eng. Dept. Texas A&M University, May.

Figures

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Peak-to-peak pressure versus whirl frequency (flooded and vented end conditions and predictions
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Radial and tangential forces versus whirl frequency (flooded and vented end conditions and predictions)
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Test apparatus; (a) squeeze film damper detail, (b) schematic of test rig and instrumentation
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Dynamic pressure and journal displacement versus time; (a) flooded plenum and (b) vented plenum
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Development of the period-averaged pressure field and uniform pressure zone versus shirl frequency (flooded and vented end conditions); (a) flooded plenum, (b) vented plenum
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Development of the period-averaged pressure field and uniform pressure zone versus the lubricant flow and supply pressure; (a) whirl frequency 16.67 Hz (1000 rpm), (b) whirl frequency 8.33 Hz (500 rpm)
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Peak-to-peak pressures versus oil flow rate and supply pressure for two whirl frequencies
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Radial and tangential forces versus oil flow rate (supply pressure) for two whirl frequencies

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