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TECHNICAL BRIEFS

Numerical Modeling of Rotordynamic Coefficients for Deliberately Roughened Stator Gas Annular Seals

[+] Author and Article Information
Gocha Chochua, Thomas A. Soulas

 Dresser-Rand Company, Paul Clark Dr., Olean, NY 14760

J. Tribol 129(2), 424-429 (Oct 20, 2006) (6 pages) doi:10.1115/1.2647531 History: Received May 02, 2006; Revised October 20, 2006

A method is proposed for computations of rotordynamic coefficients of deliberately roughened stator gas annular seals using computational fluid dynamics. The method is based on a transient analysis with deforming mesh. Frequency-dependent direct and cross-coupled rotordynamic coefficients are determined as a response to an assigned rotor surface periodic motion. The obtained numerical results are found to be in good agreement with the available test data and one-dimensional tool predictions. The method can be used as a research tool or as a virtual annular seal test rig for seal design and optimization.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Hole-pattern seals in a centrifugal compressor

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Figure 2

A hole-pattern seal

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Figure 3

Basic repeatable geometries built using (a) coarse mesh, 454 elements and (b) fine mesh, 1374 elements

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Figure 4

Full seal geometry using coarse mesh, 1,554,800 elements

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Figure 5

Force impedances for oscillation in y-direction at 200Hz using fine mesh

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Figure 6

Pressure distributions: (a) on the seal surface and (b) in the plane through the middle of the seal for f=200Hz case at the time instance when y=0 and ẏ>0

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Figure 7

Rotordynamic coefficients: (a) direct stiffness, (b) cross-coupled stiffness, (c) direct damping, and (d) cross-coupled damping obtained by CFD, experiment and 1D code

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Figure 8

Effective rotordynamic coefficients: (a) effective stiffness and (b) effective damping obtained by CFD, experiment, and 1D code

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