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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

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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