0
Research Papers: Gas Turbines: Structures and Dynamics

Experimental and Theoretical Rotordynamic Coefficients of Smooth and Round-Hole Pattern Water-Fed Annular Seals

[+] Author and Article Information
Pascal Jolly

Département Génie Mécanique et
Systèmes Complexes,
Institut PPRIME,
CNRS-Université de Poitiers-ENSMA,
SP2MI - Téléport 2,
11 Boulevard Marie et Pierre Curie,
FUTUROSCOPE CHASSENEUIL
Cedex F86962, France
e-mail: pascal.jolly@univ-poitiers.fr

Mihaï Arghir, Olivier Bonneau

Département Génie Mécanique et
Systèmes Complexes,
Institut PPRIME,
CNRS-Université de Poitiers-ENSMA,
SP2MI - Téléport 2,
11 Boulevard Marie et Pierre Curie,
FUTUROSCOPE CHASSENEUIL
Cedex F86962, France

Mohamed-Amine Hassini

EDF Lab Paris-Saclay,
Département AMA—Bureau 02BC.21,
7 boulevard Gaspard Monge,
Palaiseau F91120, France
e-mail: mohamed-amine.hassini@edf.fr

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received March 15, 2018; final manuscript received April 14, 2018; published online July 5, 2018. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(11), 112501 (Jul 05, 2018) (8 pages) Paper No: GTP-18-1130; doi: 10.1115/1.4040177 History: Received March 15, 2018; Revised April 14, 2018

This work presents the comparison between experimental and theoretical results obtained for three straight annular seals. One of the annular seals has smooth rotor and stator while the others have a textured stator; the textures are equally spaced shallow round holes, with two different depths. The experimental results were obtained on a test rig dedicated to the identification of the dynamic coefficients of high Reynolds bearings and annular seals. The test rig uses hot water (<50 °C) as a working fluid. Dynamic excitations imposed by piezoelectric shakers to the rotor enable the identification of dynamic coefficients via complex impedances. Theoretical results compared with experimental findings were obtained by numerically solving the “bulk flow” equations (film thickness averaged equations dominated by inertia effects). The numerical model was extensively validated for smooth annular seals but is less confident for textured surfaces. The present comparisons between experimental and numerical results enable to estimate the accuracy of the numerical model employed for the textured seals.

Copyright © 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Childs, D. W. , and Hale, K. , 1994, “ A Test Apparatus and Facility to Identify the Rotordynamic Coefficients of High-Speed Hydrostatic Bearings,” ASME J. Tribol., 116(2), pp. 337–344.
Zhou, H. , Zhao, S. , Xu, H. , and Zhu, J. , 2004, “ An Experimental Study on Oil-Film Dynamic Coefficients,” Trib. Int., 37(3), pp. 245–253.
Atchonouglo, K., Bonneau, O., Jolly, P., and Vallée, C., 2011, “Identification of the Dynamic Coefficients of Hybrid Bearings,” Key Eng. Mater., 482, pp. 31–38.
Jolly, P., Hassini, M. A., Arghir, M., and Bonneau, O., 2013, “Identification of Stiffness and Damping Coefficients of Hydrostatic Bearing With Angled Injection,” Part J: J. Eng. Tribol., 227(8), pp. 905–911.
Von Pragenau, G. L. , 1982, “ Damping Seals for Turbomachinery,” National Aeronautics and Space Administration, Marshall Space Flight Center, Huntsville, AL, Technical Paper No. 1987.
Childs, D. W. , and Garcia, F. , 1987, “ Test Results for Sawtooth-Pattern Damper Seals: Leakage and Rotordynamic Coefficients,” ASME J. Tribol., 109(1), pp. 124–128.
Kaneko, S. , Ikeda, T. , Saito, T. , and Ito, S. , 2003, “ Experimental Study on Static and Dynamic Characteristics of Liquid Annular Convergent-Tapered Damper Seals With Honeycomb Roughness Pattern,” ASME J. Tribol., 125(3), pp. 592–598.
Childs, D. W. , and Fayolle, P. , 1999, “ Test Results for Liquid ‘Damper’ Seals Using a Round-Hole Roughness Pattern for the Stators,” ASME J. Tribol., 121(1), pp. 42–49.
Darden, J. , Earhart, E. , and Flowers, G. , 2001, “ Comparison of the Dynamic Characteristics of Smooth Annular Seals and Damping Seals,” ASME J. Eng. Gas Turbines Power, 123(4), pp. 857–863.
Charles, S. , Bonneau, O. , and Frêne, J. , 2005, “ Determination of the Discharge Coefficient of a Thin-Walled Orifice Used in Hydrostatic Bearings,” ASME J. Tribol., 127(3), pp. 679–684.
Colebrook, C. F. , 1939, “ Turbulent Flow in Pipes, With Particular Reference to the Transition Region Between the Smooth and Rough Pipe Laws,” J. Inst. Civ. Eng., 11(4), pp. 133–156.
Zerarka, A. , 2010, “ Caractérisation Hydrodynamique des Films Minces Lubrifiants en Présence de Surfaces Texturées,” Ph.D. thesis, Université de Poitiers, Poitiers, France.
Arghir, M. , Billy, F. , Pineau, G. , Frêne, J. , and Texier, A. , 2007, “ Theoretical Analysis of Textured “Damper” Annular Seals,” ASME J. Tribol., 129(3), pp. 669–678.
Amoser, S. , 1995, “ Strömungsfelder und Radialkräfte in Labyrinthdichtungen hydraulischer Strömungsmaschinen,” Ph.D. thesis, ETH Zurich, Zürich, Switzerland, No. 11150.

Figures

Grahic Jump Location
Fig. 1

Cross-sectional view of the test rig

Grahic Jump Location
Fig. 2

Dynamic displacements imposed to the shaft (lateral displacements)

Grahic Jump Location
Fig. 3

Base-line test assembly

Grahic Jump Location
Fig. 4

Base-line test result for an imposed sinusoidal load with a frequency of 80 Hz

Grahic Jump Location
Fig. 5

Curve fitting of impedance's real and imaginary parts for identification

Grahic Jump Location
Fig. 6

Hole-textured stator

Grahic Jump Location
Fig. 7

Calculated wall friction coefficients for the textured annular seal

Grahic Jump Location
Fig. 8

Dimensionless mass flow rate

Grahic Jump Location
Fig. 9

Dimensionless stiffness coefficients for the smooth seal

Grahic Jump Location
Fig. 10

Dimensionless stiffness coefficients for the textured seal with shallow holes

Grahic Jump Location
Fig. 11

Dimensionless stiffness coefficients for the textured seal with deep holes

Grahic Jump Location
Fig. 12

Dimensionless damping coefficients for the smooth seal

Grahic Jump Location
Fig. 13

Dimensionless damping coefficients for the textured seal with shallow holes

Grahic Jump Location
Fig. 14

Dimensionless damping coefficients for the textured seal with deep holes

Grahic Jump Location
Fig. 15

Dimensionless added mass coefficients for the three test seals

Grahic Jump Location
Fig. 16

Dimensionless pressure variation of the centered seal due to a 5% increment of the eccentricity ratio

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In