The evaluation of floating bushing ring oil seals is of great importance for designs of high pressure centrifugal compressors. This is a result of their enhanced damping capacity at low speeds and their strong destabilizing action at speeds in excess of twice the compressor first critical speed. Accurate prediction of oil seal leakage and exit temperature is very important from the standpoint of the pump and cooler selection for the seal oil console. The previous research has performed thermohydrodynamic (THD) analysis of bushing seal rings with various geometries. The current work is to evaluate the influence of the mechanical deformation on the thermohydrodynamic analysis of the bushing seal ring. The finite element method is used to predict the mechanical deformation of the bushing seal ring due to oil pressure and to solve the nonlinear and coupled Reynolds and energy equations for the pressure and temperature distributions, respectively. The perturbation technique is used to evaluate the stiffness and damping coefficients of the oil seals. Eigenvalue analysis is performed to study the dynamic stability of the compressor rotor. Results comparing the seal leakage, seal oil outlet temperatures, stiffness and damping coefficients, growth factors and damped natural frequencies from the THD analyses with and without the influence of the mechanical deformation of the bushing seal ring are presented. The results indicate that under high pressure conditions the influence of the mechanical deformation of the bushing seal ring on the seal performance is very significant.

1.
Baheti, S. K., 1995, “Non-linear Finite Element Thermo-Hydrodynamic Analysis of Oil Ring Seals Used in High Pressure Centrifugal Compressors,” Ph.D. dissertation, Virginia Polytechnic Institute and State University, Blacksburg, Virginia.
2.
Baheti
S. K.
, and
Kirk
R. G.
,
1994
, “
Thermo-hydiodynamic Solution of Floating Ring Seals for High Pressure Compressors Using Finite-Element Method
,” STLE
Tribology Transactions
, Vol.
37
, No,
2
, pp.
336
346
.
3.
Baheti
S. K.
, and
Kirk
R. G.
,
1995
, “
Finite Element Thermo-Hydrodynamic Analysis of a Circumferentially Grooved Floating Oil Ring Seal
,” STLE
Tribology Transactions
, Vol.
38
, No.
1
, pp.
86
96
.
4.
Baheti
S. K.
,
Kirk
R. G.
, and
Ramesh
K.
,
1996
, “
Effect of Axially Grooved Oil Seals on the Leakage Flow and Stability of a Centrifugal Compressor
,” STLE
Tribology Transactions
, Vol.
39
, No.
2
, pp.
398
406
.
5.
Braun
M. J.
and
Dzodzo
M. B.
,
1997
, “
Three-Dimensional Flow and Pressure Patterns in a Hydrostatic Journal Bearing Pocket
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
119
, October, pp.
711
719
.
6.
Fillon
M.
,
Bligoud
J.
, and
Frene
J.
,
1992
, “
Experimental Study of Tilting-Pad Journal Bearings—Comparison with Theoretical Thermoelastohydrodynamic Results
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
114
, July, pp.
579
588
.
7.
Kim
J.
,
Palazzolo
A.
, and
Gadangi
R.
,
1994
, “
TEHD Analysis for Tilting-Pad Bearings Using Upwind Finite Element Method
,” STLE
Tribology Transactions
, Vol.
37
, No.
4
, pp.
771
783
.
8.
Kirk, R. G., 1986, “Oil Seal Dynamics: Considerations for Analysis of Centrifugal Compressors,” Proceedings of the 15th Texas A&M Turbomachinery Symposium, Corpus Christi, TX, Nov. 10–13.
9.
Kirk, R. G., and Baheti, S. K., 1997, “Design of Liquid Seals for Centrifugal Compressors,” Proceedings of ASME Design Engineering Technical Conferences, Sacramento, CA, Sept. 14–17.
10.
Kirk, R. G., and Nicholas, J. C., 1980, “Analysis of High Pressure Seals for Optimum Turbo Compressor Dynamic Performance,” Proceedings of Conference on Vibration in Rotating Machinery, I. Mech. E.
11.
Kirk
R. G.
, and
Reedy
S. W.
,
1990
, “
Analysis of Thermal Gradient Effects in Oil Ring Seals
,” STLE
Tribology Transactions
, Vol.
33
, 3, pp.
425
435
.
12.
Miller
R. E.
, and
Kirk
R. G.
,
1979
, “
The Influence of High Pressure Oil Seals on Turbo-Rotor Stability
,”
ASLE Transactions
, Jan., Vol.
22
, No.
1
, pp.
14
24
.
13.
Monmousseau
P.
,
Fillon
M.
, and
Frene
J.
,
1997
, “
Transient Thermoelastohy-drodynamic Study of Tilting-Pad Journal Bearings—Comparison Between Experimental Data and Theoretical Results
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
119
, July, pp.
401
407
.
14.
Pinkus, O., 1990, Thermal Aspects of Fluid Film Tribology, ASME Press, New York, ISBN 0-7918-0011-3.
15.
Reedy, S. W., and Kirk, R. G., 1992, “Advanced Analysis of Multi-Ring Liquid Seals,” ASME Journal of Vibration and Acoustics, pp. 42–46.
16.
Zirkelback
N.
, and
San Andres
L.
,
1996
, “
Bulk-Flow Model for the Transition to Turbulence Regime in Annular Pressure Seals
,” STLE
Tribology Transactions
, Vol.
39
, No.
4
, pp.
835
842
.
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