On Liquid Film Pressure Sealing

[+] Author and Article Information
Jean-Nicolas Favre, I. L. Ryhming

Fluid Mechanics Laboratory, Swiss Federal Institute of Technology, Lausanne, Switzerland

J. Fluids Eng 107(1), 67-72 (Mar 01, 1985) (6 pages) doi:10.1115/1.3242442 History: Received June 06, 1983; Online October 26, 2009


The dynamics of the thin film established, by oil injection, on the inside wall of the casing in certain rotary compressors are analyzed both experimentally and theoretically. The film may provide an effective pressure seal to prevent leakage of air from one side of a rotor lobe to the other. It is found that Reynolds’ bearing theory, corrected for Reynolds number and surface tension effects, gives reasonable results for the film thickness needed to sustain typical operational pressure differences in the machine. The theoretical predictions have been verified experimentally in a series of tests performed in a specially designed apparatus.

Copyright © 1985 by ASME
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