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TECHNICAL PAPERS

Rotordynamic-Coefficient and Leakage Characteristics for Hole-Pattern-Stator Annular Gas Seals—Measurements Versus Predictions

[+] Author and Article Information
Dara W. Childs, Jonathan Wade

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

J. Tribol 126(2), 326-333 (Apr 19, 2004) (8 pages) doi:10.1115/1.1611502 History: Received February 20, 2003; Revised July 18, 2003; Online April 19, 2004
Copyright © 2004 by ASME
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References

Childs,  D., and Moyer,  D., 1985, “Vibration Characteristics of the HPOTP (High Pressure Oxygen Turbopump) of the SSME (Space Shuttle Main Engine),” ASME J. Eng. Gas Turbines Power, 107, pp. 152–159.
Yu,  Z., and Childs,  D. W., 1998, “A Comparison of Experimental Rotordynamic Coefficients and Leakage Characteristics Between Hole-Pattern Gas Damper Seals and a Honeycomb Seal,” ASME J. Eng. Gas Turbines Power, 120(4), pp. 778–783.
Moore, J., Walker, S., and Kuzdal, M., 2002, “Rotordynamic Stability Measurements During Full Load Testing of a 6000 psi Reinjection Centrifugal Compressor,” Proceedings, 31st Texas A&M University Turbomachinery Symposium, pp. 29–38.
Gelin, A., Pugnet, J.-M., Bolusset, D., and Friez, P., 1996, “Experience in Full Load Testing Natural Gas Compressors for Rotordynamic Improvements,” International Gas Turbine Conference, ASME Paper No. 96-GT-378.
Memmott, E., 1994, “Stability of a High Pressure Centrifugal Compressor Through Application of Shunt Holes and a Honeycomb Labyrinth,” 13th Machinery Dynamics Seminar, CMVA, September, 12–13.
Scharrer, J., 1989, written discussion of reference 7, ASME J. of Tribology, p. 301.
Childs,  D., Elrod,  D., and Hale,  K., 1989, “Annular Honeycomb Seals: Test Results for Leakage and Rotordynamic Coefficients; Comparisons to Labyrinth and Smooth Configurations,” ASME J. Tribol., 111, pp. 293–301.
Childs, D., and Kleynhans, G., 1992, “Experimental Rotordynamic and Leakage Results for Short (L/D=1/6) Honeycomb and Smooth Annular Pressure Seals,” IMechE Proceedings, Fifth International Conference on Vibrations in Rotating Machinery, September 7–10, Bath, England.
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.
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, 4, pp. 949–957.
Dawson,  M., Childs,  D., Holt,  C., and Phillips,  S., 2002, “Theory Versus Experiments for the Dynamic Impedances of Annular Gas Seals: Part2—Smooth and Honeycomb Seals,” ASME J. Eng. Gas Turbines Power, 24, pp. 963–970.
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. 337–334.
Dawson,  M., Childs,  D., Holt,  C., and Phillips,  S., 2002, “Theory Versus Experiments for the Dynamic Impedances of Annular Gas Seals: Part 1—Test Facility and Apparatus,” ASME J. Eng. Gas Turbines Power, 24, pp. 958–963.
Weatherwax, M., and Childs, D. 2002, “The Influence of Eccentricity on the Leakage and Rotordynamic Coefficients of a High-Pressure Honeycomb Annular Gas Seal, Measurements Versus Predictions,” ASME Paper 2002-TRIB-207.
Marquette,  O., Childs,  D., and San Andres,  L., 1997, “Eccentricity Effects on the Rotordynamic Coefficients of Plain Annular Seals: Theory Versus Experiment,” Transactions of the ASME J. Tribology, 119, pp. 443–448.
Picardo, A., 2003, “High Pressure Testing of Labyrinth Seals,” M.S. thesis, Department of Mechanical Engineering, Texas A&M University, College Station, TX.
Kurtin,  K., Childs,  D., San Andres,  L., and Hale,  K., 1993, “Experimental Versus Theoretical Characteristics of a High-Speed Hybrid (Combination Hydrostatic and Hydrodynamic) Bearing,” ASME J. Tribol., 115, pp. 160–169.
Ha,  T. W., and Childs,  D. W., 1992, “Friction-Factor Data for Flat-Plate Tests of Smooth and Honeycomb Surfaces,” ASME J. Tribol., 14, pp. 722–730.
D’Souza,  R., and Childs,  D., 2002, “A Comparison of Rotordynamic-Coefficient Predictions of Annular Honeycomb Gas Seals Using Different Friction-Factor Models,” ASME J. Tribol., 124, pp. 524–529.
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.
Ha,  T.-W., Morrison,  G., and Childs,  D., 1992, “Friction-Factor Characteristics for Narrow-Channels With Honeycomb Surfaces,” ASME J. Tribol., 114, pp. 714–721.<

Figures

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Cross-sectional view of the test rig
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Pitot tube location and preswirl rings
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Geometry of the hole pattern
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Frequency dependent plot of KXX,KXY,CXX,CXY versus excitation frequency Ω for Cr=0.20 mm, ω=20,200 rpm, u0(0)=0.598, and PR=0.49
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Frequency dependent plot of KXX,KXY,CXX,CXY versus excitation frequency Ω for Cr=0.20 mm, ω0=20,200 rpm, u0(0)=0.028, and PR=0.45
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Frequency dependent plot of KXX,KXY,CXX,CXY versus excitation frequency Ω for Cr=0.10 mm, ω=20,200 rpm, u0(0)=0.303, and PR=0.47
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Cross-coupled stiffness coefficient k(Ω) for Cr=0.10 mm, ω=20,200 rpm, and PR=0.45 for u0(0)=0.303, 0.191, and 0.156
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Cross-coupled stiffness coefficient k(Ω) for Cr=0.20 mm, ω=20,200 rpm, and PR=0.49 for u0(0)=0.598, 0.304, and 0.028
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Effective damping coefficient Ceff(Ω) for Cr=0.20 mm, ω=20,200 rpm, and PR=0.49 for u0(0)=0.598, 0.304, and 0.028
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Keff and keff for the two clearances with no preswirl ω=20,200 rpm, and PR=0.49

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