Squeeze film dampers (SFDs) aid to attenuate vibrations in compressors and turbines while traversing critical speeds. In actual applications, gas ingestion from the environment may lead to the formation of a foamy lubricant that degrades the rotor/bearing system dynamic performance. Impact and imbalance response tests conducted on a rigid rotor supported on SFDs, and aimed to emulate the pervasive effect of air ingestion into the damper film lands, are reported. Two types of squeeze film damper support the test rotor, one is a conventional cylindrical design with a squirrel cage-type elastic support, and the other is a compact four-pad damper with integral wire EDM elastic supports. Both dampers have identical diameter and radial clearance. Controlled (air in oil) mixtures ranging from pure oil to all air conditions are supplied to the SFDs, and measurements of the transient rotor response to calibrated impact loads are conducted. System damping coefficients, identified from acceleration/load transfer functions, decrease steadily as the air content in the mixture increases. However, measurements of the rotor synchronous imbalance response conducted with a lubricant bubbly mixture (50% air volume) show little difference with test results obtained with pure lubricant supplied to the dampers. The experimental results show that air entrainment is process and device-dependent, and that small amounts of lubricant enable the effective action of SFDs when the rotor traverses a critical speed.
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April 2004
Technical Papers
Dynamic Response of Squeeze Film Dampers Operating With Bubbly Mixtures
Luis San Andres, Professor,
Luis San Andres, Professor
Mechanical Engineering Department, Texas A&M University, College Station, TX 77843-3123
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Oscar C. De Santiago, Research Assistant
Oscar C. De Santiago, Research Assistant
Mechanical Engineering Department, Texas A&M University, College Station, TX 77843-3123
Search for other works by this author on:
Luis San Andres, Professor
Mechanical Engineering Department, Texas A&M University, College Station, TX 77843-3123
Oscar C. De Santiago, Research Assistant
Mechanical Engineering Department, Texas A&M University, College Station, TX 77843-3123
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Amsterdam, The Netherlands, June 3–6, 2002; Paper No. 2002-GT-30317. Manuscript received by IGTI, Dec. 2001, final revision, Mar. 2002. Associate Editor: E. Benvenuti.
J. Eng. Gas Turbines Power. Apr 2004, 126(2): 408-415 (8 pages)
Published Online: June 7, 2004
Article history
Received:
December 1, 2001
Revised:
March 1, 2002
Online:
June 7, 2004
Citation
San Andres, L., and De Santiago, O. C. (June 7, 2004). "Dynamic Response of Squeeze Film Dampers Operating With Bubbly Mixtures ." ASME. J. Eng. Gas Turbines Power. April 2004; 126(2): 408–415. https://doi.org/10.1115/1.1690770
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