Rotordynamic Coefficients for Compressible Flow in Tapered Annular Seals

[+] Author and Article Information
C. C. Nelson

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

J. Tribol 107(3), 318-325 (Jul 01, 1985) (8 pages) doi:10.1115/1.3261062 History: Received March 18, 1985; Online October 29, 2009


Derivation of the governing equations for compressible flow in a tapered annular seal is based on Hirs’ turbulent bulk-flow model. Zeroth and first-order perturbation equations are developed by an expansion in the eccentricity ratio. These equations are numerically integrated to obtain the leakage, and the direct and cross-coupled stiffness and damping coefficients. Seal parameters similar to the Space Shuttle Main Engine High Pressure Oxidizer Turbopump are used to demonstrate output from the analysis procedure. The effects of preswirl and seal taper are shown for three different length-to-diameter ratios. Generally the results indicate that prerotating the fluid significantly increases the cross-coupled stiffness but has little effect on the other coefficients, and increasing the convergent taper increases the direct stiffness while decreasing the direct damping and cross-coupled stiffness.

Copyright © 1985 by ASME
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