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RESEARCH PAPERS

An Annular Gas Seal Analysis Using Empirical Entrance and Exit Region Friction Factors

[+] Author and Article Information
D. A. Elrod

Mechanical Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061

D. W. Childs, C. C. Nelson

Mechanical Engineering Department, Texas A&M University, College Station, Texas 77843

J. Tribol 112(2), 196-204 (Apr 01, 1990) (9 pages) doi:10.1115/1.2920242 History: Received February 14, 1989; Online June 05, 2008

Abstract

Wall shear stress results from stationary-rotor flow tests of five annular gas seals are used to develop entrance and exit region friction factor models. The friction factor models are used in a bulk-flow seal analysis which predicts leakage and rotor-dynamic coefficients. The predictions of the analysis are compared to experimental results and to the predictions of Nelson’s analysis (1985). The comparisons are for smooth-rotor seals with smooth and honeycomb-stators. The present analysis predicts the destabilizing cross-coupled stiffness of a seal better than Nelson’s analysis. Both analyses predict direct damping well and direct stiffness poorly.

Copyright © 1990 by The American Society of Mechanical Engineers
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