Theory Versus Experiment for the Rotordynamic Coefficients of Annular Gas Seals: Part 2—Constant-Clearance and Convergent-Tapered Geometry

[+] Author and Article Information
C. C. Nelson, D. W. Childs, C. Nicks, D. Elrod

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

J. Tribol 108(3), 433-437 (Jul 01, 1986) (5 pages) doi:10.1115/1.3261228 History: Received March 22, 1985; Online October 29, 2009


An experimental test facility is used to measure the leakage and rotordynamic coefficients of constant-clearance and convergent-tapered annular gas seals. The results are presented along with the theoretically predicted values. Of particular interest is the prediction that optimally tapered seals will have significantly larger direct stiffness than straight seals. The experimental results verify this prediction. Generally the theory does quite well, but fails to predict the large increase in direct stiffness when the fluid is prerotated.

Copyright © 1986 by ASME
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