Theory Versus Experiment for the Rotordynamic Coefficients of Annular Gas Seals: Part 1—Test Facility and Apparatus

[+] Author and Article Information
D. W. Childs, C. E. Nelson, C. Nicks, J. Scharrer, D. Elrod, K. Hale

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

J. Tribol 108(3), 426-431 (Jul 01, 1986) (6 pages) doi:10.1115/1.3261226 History: Received March 22, 1985; Online October 29, 2009


A facility and apparatus are described for determining the rotordynamic coefficients and leakage characteristics of annular gas seals. The apparatus has a current top speed of 8000 cpm with a nominal seal diameter of 15.24 cm (6 in.). The air-supply unit yields a seal pressure ratio of approximately 7. The inlet tangential velocity can also be controlled. An external shaker is used to excite the test rotor. The apparatus has the capability to independently calculate all rotordynamic coefficients at a given operating condition with one excitation frequency.

Copyright © 1986 by ASME
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