Operating Characteristics of an Externally Pressurized Gas Lubricated Piston Ring

[+] Author and Article Information
Minoru Yamamoto

Department of Mechanical Engineering, Kyoto University, Kyoto 606-01, Japan

Haruo Mori

Department of Mechanical Engineering, Setsunan University, Neyagawa, Osaka 572, Japan

Tsuneo Yoshikawa

Department of Mechanicai Engineering, Kyoto University, Kyoto 606-01, Japan

J. Tribol 117(3), 534-539 (Jul 01, 1995) (6 pages) doi:10.1115/1.2831287 History: Received March 01, 1993; Revised August 30, 1994; Online January 24, 2008


An analytical model is presented to obtain the film thickness profile of an externally pressurized gas lubricated piston ring which is applied to an air compressor. In order to examine the effects of the ends of the ring, the analysis is based on the two-dimensional, transient, compressible Reynolds equation accounting for the ring deflection and the equilibrium condition of the ring in the clearance space between the piston and the cylinder bore. In the numerical simulation, the Reynolds equation is discretized by using a cell method. The resulting nonlinear system of equations is solved by the Newton-Raphson iteration method. The obtained results show that the piston ring keeps the lubricating film thickness within a narrow range of the design clearance over the entire circumferential area throughout one cycle of compressor operation.

Copyright © 1995 by The American Society of Mechanical Engineers
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