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TECHNICAL PAPERS

Flow Visualization and Forces From a Squeeze Film Damper Operating With Natural Air Entrainment

[+] Author and Article Information
Luis San Andrés

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

Sergio E. Diaz

Departamento de Mecȧnica, Universidad Simȯn Bolivar, Caracas, Venezuela

J. Tribol 125(2), 325-333 (Mar 19, 2003) (9 pages) doi:10.1115/1.1510878 History: Received January 20, 2002; Revised July 02, 2002; Online March 19, 2003
Copyright © 2003 by ASME
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References

San Andrés, 2000, “Squeeze Film Dampers—Design and Operating Issues,” Class Notes on Modern Lubrication, Texas A&M University, College Station, TX.
Diaz,  S., and San Andrés,  L., 2001, “A Model for Squeeze Film Dampers Operating with Air Entrainment and Validation with Experiments,” ASME J. Tribol., 123(1), pp. 125–133.
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.
Dowson, D., and Taylor, M. 1974, “Fundamental Aspects of Cavitation in Bearings,” Proceedings of the 1st Leeds-Lyon Symposium on Tribology, University of Leeds, England, pp. 15–28.
Cole, J. A., and Hughes, C. J., 1957, “Visual Study of Film Extent in Dynamically Loaded Complete Journal Bearings,” Proc. Lub. Wear Conf., pp. 147–149.
White, D. C., 1970, “Squeeze Film Journal Bearings,” Ph. D. Dissertation, Cambridge University.
Marsh, H., 1974, “Cavitation in Dynamically Loaded Journal Bearings,” Proceedings of the 1st Leeds-Lyon Symposium on Tribology, University of Leeds, England, pp. 91–95.
Bansal,  P. N., and Hibner,  D. H., 1978, “Experimental and Analytical Investigation of Squeeze Film Bearing Damper Forces Induced by Offset Circular Whirl Orbits,” ASME J. Mech. Des., 100, pp. 549–557.
Walton,  J., Walowit,  E., Zorzi,  E., and Schrand,  J., 1987, “Experimental Observation of Cavitating Squeeze Film Dampers,” ASME J. Tribol., 109, pp. 290–295.
Diaz,  S., and San Andrés,  L., 1997, “Measurements of Pressure in a Squeeze Film Damper with an Air/Oil Bubbly Mixture,” STLE Tribol. Trans., 41(2), pp. 282–288.
Diaz,  S., and San Andrés,  L., 1998, “Reduction of the Dynamic Load Capacity in a Squeeze Film Damper Operating with a Bubbly Mixture,” ASME J. Eng. Gas Turbines Power, 121, pp. 703–709.
Diaz,  S., and San Andrés,  L., 2001, “Air Entrainment Versus Lubricant Vaporization in Squeeze Film Dampers,” ASME J. Eng. Gas Turbines and Power, 123(4), pp. 871–877.

Figures

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(a) Stationary aerated cavity in a journal bearing; (b) Squeeze film flow of an open-ended SFD subject to air entrainment (window span of 30°). U and V denote the journal rotational speed and whirl speed, respectively.
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Schematic view of test rig and instrumentation (L=31.1 mm (1.22 in), D=129.3 mm (5.10 in), C=0.254 mm (0.010 in), Z1=5.6 mm (0.22 in), Z2=16.7 mm (0.66 in), Z3=37.1 mm (1.46 in), PP: Displacement sensor, PT: pressure transducer, TT: Thermocouple, PG: pressure gauge).
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Film dynamic pressure (210°, Z2) and period averaged pressure, and film thickness versus time for test at 1500 rpm and 55 kPa (8 psi) gauge feed pressure. Period of motion=40 ms.
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Period-average film pressures at (210°, Z2), (150°, Z2) and (180°, Z2) and film thickness versus time for test at 1500 rpm and 55 kPa (8 psig) gauge feed pressure. Numbered circles relate to photographs of flow depicted in Fig. 5.
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Photographs of flow field in SFD (30° span) at key instances of journal motion (see Fig. 4). Frames in same column correspond to the same relative instant within a period of motion. Frames 1–6 correspond to 1st period, 7–12 to 2nd period, and 13–18 to 3rd period.
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Series of flow images depicting bubble growth within lubricant film. Tests at 1500 rpm (25 Hz) and 55 kPa (8 psi) gauge feed pressure. Period of motion=40 ms.
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Film dynamic pressures and film thickness and flow photographs at (a) 110 kPa/500 rpm, (b) 151 kPa/1,000 rpm
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Film dynamic pressures and film thickness versus time for all tests. Feed pressure/speed varies. Left: Z1 and right: Z2 planes.
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Photographs of flow field for a test at 1500 rpm and feed pressure 193 kPa (28 psi). Elapsed time for photographs is 2 ms (Period=40 ms).
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Peak-to-peak dynamic film pressures versus feed pressure for tests at 500, 1500, and 3000 rpm (Two axial locations of measurement).
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Peak-to-peak dynamic film pressures versus journal speed for range of feed pressures. Two axial locations of measurement noted.
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Estimated radial and tangential damper forces/unit length versus feed pressures. Two axial locations of measurement noted.
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Estimated radial and tangential damper forces/unit length versus journal speed at Z2 plane

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