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TECHNICAL PAPERS

Theory Versus Experiment for the Rotordynamic Characteristics of a High Pressure Honeycomb Annular Gas Seal at Eccentric Positions

[+] Author and Article Information
Mark Weatherwax

Halliburton KBR

Dara W. Childs

Turbomachinery Laboratory, Texas A&M University, College Station, TX 77843

J. Tribol 125(2), 422-429 (Mar 19, 2003) (8 pages) doi:10.1115/1.1504093 History: Received March 22, 2002; Revised July 01, 2002; Online March 19, 2003
Copyright © 2003 by ASME
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References

Childs, D., and Vance, J., 1997, “Annular Gas Seals and Rotordynamics of Compressors and Turbines,” Proceedings of the 26th Turbomachinery Symposium, Turbomachinery Laboratory, Texas A&M University, pp. 201–220.
Dawson, M., Childs, D., Holt, C., and Phillips, S., 2001, “Theory Versus Experiments for the Dynamic Impedances of Annular Gas Seals: Part A—Test Facility and Apparatus,” ASME Paper 2001-GT-0237.
Dawson, M., Childs, D., Holt, C., and Phillips, S., 2001, “Theory Versus Experiments for the Dynamic Impedances of Annular Gas Seals: Part B Smooth and Honeycomb Seals,” ASME Paper 2001-GT-0238.
Holt,  C., and Childs,  D., 2002, “Theory Versus Experiment Results for the Dynamic Impedances of Two Hole Pattern Annular Gas Seals,” ASME J. Tribol., 24, pp. 137–143.
Li, J., Kushner, F., and DeChoudry, P., 2000, “Gas Damper Seal Test Results, Theoretical Correlation and Application in High-Pressure Compressors,” Proceedings of the 29th Turbomachinery Symposium, Texas A&M University, pp. 55–64.
Kleynhans,  G., and Childs,  D., 1997, “The Acoustic Influence of Cell Depth on the Rotordynamic Characteristics of Smooth-Rotor/Honeycomb-Stator Annular Gas Seals,” ASME J. Eng. Gas Turbines Power, 119, pp. 949–957.
Childs,  D., and Hale,  K., 1994, “A Test Apparatus and Facility to Identify the Rotordynamic Coefficients of High-Speed Hydrostatic Bearings,” ASME J. Tribol., 116, pp. 337–344.
Marquette,  O., Childs,  D., and San Andrés,  L., 1997, “Eccentricity Effects on the Rotordynamic Coefficients of Plain Annular Seals: Theory Versus Experiment,” ASME J. Tribol., 119, pp. 443–448.
Ha,  T. W., and Childs,  D., 1994, “Annular Honeycomb-Stator Turbulent Gas Seal Analysis Using A New Friction-Factor Model Based on Flat Plate Tests,” ASME J. Tribol., 116, pp. 352–360.
San Andrés,  L., 1991, “Analysis of Variable Fluid Properties, Turbulent Annular Seals,” ASME J. Tribol., 113, pp. 694–702.
Ha,  T., and Childs,  D., 1992, “Friction-Factor Data for Flat-Plate Tests of Smooth and Honeycomb Surfaces,” ASME J. Tribol., 114, pp. 722–729.
Nelson,  C. C., and Nguyen,  D. T., 1987, “Comparison of Hirs’ Equation with Moody’s Equation for Determining Rotordynamic Coefficients of Annular Pressure Seals,” ASME J. Tribol., 109, pp. 144–148.
D’Souza,  R., and Childs,  D., 2001, “A Comparison of Rotordynamic-Coefficient Predictions of Annular Honeycomb Gas Seals Using Different Friction-Factor Models,” ASME J. Tribol., 124(3), pp. 524–529.
Kurtin,  K. A., Childs,  D. W., San Andrés,  L. A., and Hale,  R. K., 1993, “Experimental Versus Theoretical Characteristics of a High-Speed Hybrid (Combination Hydrostatic and Hydrodynamic) Bearing,” ASME J. Tribol., 115, pp. 160–169.
Alexander,  C. R., Childs,  D. W., and Yang,  Z., 1995, “Theory Versus Experiment for the Rotordynamic Characteristics of a Smooth Annular Gas Seal at Eccentric Positions,” ASME J. Tribol., 117, pp. 148–152.
Lomakin, A., 1958, “Calculation of Critical Number of Revolutions and the Conditions Necessary for Dynamic Stability of Rotors in High Pressure Hydraulic Machines When Taking into Account Forces Originating in Sealings,” Power and Mechanical Engineering, (in Russian).

Figures

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Side view of the test section
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Leakage flow rate versus eccentricity
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Honeycomb direct stiffness versus excitation frequency
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Honeycomb cross-coupled stiffness versus excitation frequency
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Honeycomb normalized direct damping versus excitation frequency
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Honeycomb cross-coupled damping versus excitation frequency
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Synchronous nondimensional direct stiffness versus eccentricity ratio
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Synchronous nondimensional cross-coupled stiffness versus eccentricity ratio
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Synchronous damping versus eccentricity ratio
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Stiffness and damping coefficients at 80 Hz for 35 percent back-pressure ratio
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Stiffness and damping coefficients at 80 Hz for 50 percent back-pressure

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