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Other (Seals, Manufacturing)

A Computational Fluid Dynamics/Bulk-Flow Hybrid Method for Determining Rotordynamic Coefficients of Annular Gas Seals

[+] Author and Article Information
Patrick J. Migliorini1

Rotating Machinery and Controls (ROMAC) Laboratory, Department of Mechanical and Aerospace Engineering,  University of Virginia, 122 Engineer’s Way, Charlottesville, Virginia 22904–4746migs@virginia.edu

Alexandrina Untaroiu

Rotating Machinery and Controls (ROMAC) Laboratory, Department of Mechanical and Aerospace Engineering,  University of Virginia, 122 Engineer’s Way, Charlottesville, Virginia 22904–4746au6d@virginia.edu

Houston G. Wood

Rotating Machinery and Controls (ROMAC) Laboratory, Department of Mechanical and Aerospace Engineering,  University of Virginia, 122 Engineer’s Way, Charlottesville, Virginia 22904–4746hgw9p@virginia.edu

Paul E. Allaire

Rotating Machinery and Controls (ROMAC) Laboratory, Department of Mechanical and Aerospace Engineering,  University of Virginia, 122 Engineer’s Way, Charlottesville, Virginia 22904–4746pea@virginia.edu

1

Corresponding author.

J. Tribol 134(2), 022202 (Apr 12, 2012) (9 pages) doi:10.1115/1.4006407 History: Received December 16, 2011; Revised March 14, 2012; Published April 11, 2012; Online April 12, 2012

This paper presents a new computational fluid dynamics (CFD)/bulk-flow hybrid method to determine the rotordynamic characteristics of annular gas seals. The method utilizes CFD analysis to evaluate the unperturbed base state flow, an averaging method to determine the base state bulk-flow variables, and a bulk-flow perturbation method to solve for the fluid forces acting on an eccentric, whirling rotor. In this study the hybrid method is applied to a hole-pattern seal geometry and compared with experimental data and numerical and analytical methods. The results of this study show that the dynamic coefficients predicted by the hybrid method agree well with the experimental data, producing results that are comparable with a full, three-dimensional, transient, whirling rotor CFD method. Additionally, the leakage rate predicted by the hybrid method is more agreeable with experiment than the other methods. The benefit of the present method is the ability to calculate accurate rotordynamic characteristics of annular seals that are comparable to results produced by full, transient CFD analyses with a simulation time on the order of bulk-flow analyses.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

6.2 deg sector of the full seal geometry developed for this study

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Figure 2

Cut planes and lines defined axially along the seal geometry

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Figure 3

Detailed view of mesh used for this study

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Figure 4

Bulk mean pressure determined from CFD simulation

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Figure 5

Bulk mean velocities determined from CFD simulation

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Figure 6

Friction factors determined from CFD simulation

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Figure 7

Direct stiffness versus excitation frequency

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Figure 8

Cross-coupled stiffness versus excitation frequency

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Figure 9

Direct damping versus excitation frequency

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Figure 10

Cross-coupled damping versus excitation frequency

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Figure 11

Effective stiffness versus excitation frequency

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Figure 12

Effective damping versus excitation frequency

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