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Effect of fluid compressibility on journal bearing performanceAn analysis was undertaken to determine the effect of fluid film compressibility on the performance of fluid film bearings. A new version of the Reynolds equation was developed, using a polytropic expansion, for both steady-state and dynamic conditions. Polytropic exponents from 1 (isothermal) to 1000 (approaching an incompressible liquid) were evaluated for two bearing numbers, selected from a range of practical interest for cryogenic application, and without cavitation. Bearing loads were insensitive to fluid compressibility for low bearing numbers, as was expected. The effect of compressibility on attitude angle was significant, even when the bearing number was low. A small amount of fluid compressibility was enough to obtain stable running conditions. Incompressible liquid lacked stability at all conditions. Fluid compressibility can be used to control the bearing dynamic coefficients, thereby influencing the dynamic behavior of the rotor-bearing system.
Document ID
19930065247
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dimofte, Florin
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1993
Publication Information
Publication: STLE Tribology Transactions
Volume: 36
Issue: 3
ISSN: 0569-8197
Subject Category
Mechanical Engineering
Accession Number
93A49244
Distribution Limits
Public
Copyright
Other

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