Comparison of Predictions With Test Results for Rotordynamic Coefficients of a Four-Pocket Gas Damper Seal

[+] Author and Article Information
Jiming Li

Elliot Company, Jeannette, PA 15644

David Ransom

Rocketdyne Division, Boeing, Canoga Park, CA 91309

Luis San Andrés, John Vance

Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123

J. Tribol 121(2), 363-369 (Apr 01, 1999) (7 pages) doi:10.1115/1.2833948 History: Received January 15, 1998; Revised June 18, 1998; Online January 24, 2008


Experiments and field applications have demonstrated that multiple-pocket gas damper seals effectively eliminate subsynchronous vibration and attenuate imbalance response at the critical speeds in turbomachinery. A one-control volume, turbulent bulk-flow model for the prediction of the seal leakage and rotordynamic force coefficients of centered multiple-pocket damper seals is hereby detailed. Comparisons of numerical predictions with experimental force coefficients for a four-pocket damper seal are presented. The bulk-flow model and experiments indicate the seal direct stiffness and damping force coefficients are insensitive to journal speed while the cross-coupled stiffnesses increase slightly. However, the current model overpredicts the direct damping coefficient and underpredicts the direct stiffness coefficient for increasing test pressure ratios. Computed results show that the force coefficients of multiple-pocket gas damper seals are also functions of the rotor excitation frequency.

Copyright © 1999 by The American Society of Mechanical Engineers
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