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TECHNICAL PAPERS

Dynamic Force Coefficients of a Multiple-Blade, Multiple-Pocket Gas Damper Seal: Test Results and Predictions

[+] Author and Article Information
Jiming Li

Elliott Company, Jeanette, PA 15644

Ramon Aguilar, Luis San Andrés, John M. Vance

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

J. Tribol 122(1), 317-322 (Jun 29, 1999) (6 pages) doi:10.1115/1.555360 History: Received February 04, 1999; Revised June 29, 1999
Copyright © 2000 by ASME
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References

Childs, D. W., 1993, Turbomachinery Rotordynamics, Wiley, New York.
Alford,  J. S., 1965, “Protecting Turbomachinery from Self-Excited Rotor Whirl,” ASME J. Eng. Power, 87, pp. 333–344.
Murphy, B. T., and Vance, J. M., 1980, “Labyrinth Seal Effects on Rotor Whirl Instability,” Proceedings of the 2nd International Conference on Vibrations in Rotating Machinery (ImechE), C306/80, Cambridge, England, pp. 369–373.
Vance, J. M., Zierer, J. J., and Conway, E. M., 1993, “Effect of Straight Through Labyrinth Seals on Rotordynamics,” Proceedings of the 14th Vibration and Noise Conference, Albuquerque, NM, ASME DE-Vol. 60, pp. 159–171.
D. W.,  Childs, and Scharrer,  J. K., 1988, “Theory versus Experiment for the Rotordynamic Coefficient of Labyrinth Gas Seals: Part II—A Comparison to Experiment,” ASME Journal of Vibration, Acoustic, Stress, and Reliability in Design, 110, pp. 281–287.
Vance, J. M., and Schultz, R. R., 1993, “A New Damper Seal for Turbomachinery,” Proceedings of the 14th Vibration and Noise Conference, Albuquerque, NM. ASME DE-Vol. 60. pp. 139–148.
Li, J., and Vance, J. M., 1995, “Effects of Clearance and Clearance Ratio on Two and Three Bladed TAMSEALs,” Turbomachinery Laboratory Research Progress Report, TRC-Seal-4-95, Texas A&M University, College Station, April.
Vance,  J. M., and Li,  J., 1996, “Test Results of A New Damper Seal for Vibration Reduction in Turbomachinery,” ASME J. Eng. Gas Turbines Power, 118, pp. 843–846.
Richards, R. L., Vance, J. M., and Zeidan, F. Y., 1995, “Using a Damper Seal to Eliminate Subsynchronous Vibrations in Three Back-to-Back Compressors,” Proceedings of the 24th Turbomachinery Symposium, Houston, pp. 59–71.
Ransom,  D. L., Li,  J., San Andrés,  L., and Vance,  J. M., 1999, “Experimental Force Coefficients for a Two-Bladed Labyrinth Seal and a Four-Pocket Damper Seal,” ASME J. Tribol., 121, No. 2, pp. 370–376.
Li,  J., San Andrés,  L. , and Vance,  J. M., 1999, “A Bulk-Flow Analysis of Multiple-Pocket Gas Damper Seals,” ASME J. Eng. Gas Turbines Power, 121, No. 2, pp. 355–362.
Li,  J., Ransom,  D., San Andrés,  L., and Vance,  J. M., 1999, “Comparison of Predictions with Test Results for Rotordynamic Coefficients of a Four-Pocket Gas Damper Seal,” ASME J. Tribol., 121, No. 2, pp. 363–369.
Vance, J. M., and Sundararajan, P., 1993, “Design And Applications Analysis of A New Damper Seal,” TRC-Seal-4-93. Turbomachinery Laboratory Research Progress Report. Texas A&M University, College Station, April.
Vance,  J. M., Cardon,  B. P., San Andrés,  L. A., and Storace,  A. F., 1993, “A Gas-Operated Bearing Damper for Turbomachinery,” ASME J. Eng. Gas Turbines Power, 115, pp. 383–389.
Li, J., 1995, “The Effect of A New Damper Seal on Rotordynamics,” Master’s thesis, Texas A&M University, College Station, August.
Van Doormaal,  J. P., and Raithby,  G. D., 1984, “Enhancements of the SIMPLE Method for Predicting Incompressible Fluid Flows,” Numerical Heat Transfer, 7, pp. 147–163.
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Diaz, S., and San Andrés, L., 1999, “A Method for Identification of Bearing Force Coefficients and Its Application to a Squeeze Film Damper with a Bubbly Lubricant,” presented at the STLE Annual Meeting, Las Vegas, NV, May (STLE Preprint 99-AM-5).

Figures

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Geometry of a four-blade, two-four pocket damper seal
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Schematic view of test rig for identification of force coefficients in gas damper seals
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Seal mass flow rate versus pressure ratio. Tests and predictions at 3000 rpm.
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Seal direct stiffness coefficients versus pressure ratio. Tests and predictions at 3000 rpm.
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Seal direct damping coefficients versus pressure ratio. Tests and predictions at 3000 rpm.
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Seal direct stiffness coefficients (KXX and KYY) versus journal speed. Tests and predictions for a pressure ratio of 2.0.
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Seal direct stiffness coefficients (KXX and KYY) versus journal speed. Tests and predictions for a pressure ratio of 2.5.
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Seal direct damping coefficients (CXX and CYY) versus journal speed. Tests and predictions for a pressure ratio of 2.0.
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Seal direct damping coefficients (CXX and CYY) versus journal speed. Tests and predictions for a pressure ratio of 2.5.
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Seal cross-coupled stiffness coefficients (KXY and KYX) versus journal speed. Tests and predictions for a pressure ratio of 2.0.

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