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Research Papers: Elastohydrodynamic Lubrication

Thermoelastohydrodynamic Behavior of Gas Spiral Groove Face Seals Operating at High Pressure and Speed

[+] Author and Article Information
Shaoxian Bai

College of Mechanical Engineering,
Zhejiang University of Technology,
Hangzhou 310032, China
e-mail:  bshaoxian@163.net

Chunhong Ma, Xudong Peng

College of Mechanical Engineering,
Zhejiang University of Technology,
Hangzhou 310032, China

Shizhu Wen

State Key Laboratory of Tribology,
Tsinghua University,
Beijing 100084, China

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 18, 2014; final manuscript received November 10, 2014; published online January 29, 2015. Assoc. Editor: George K. Nikas.

J. Tribol 137(2), 021502 (Apr 01, 2015) (11 pages) Paper No: TRIB-14-1137; doi: 10.1115/1.4029358 History: Received June 18, 2014; Revised November 10, 2014; Online January 29, 2015

A numerical modeling of thermoelastohydrodynamic gas spiral groove face seal behavior is presented. Temperature fields of the fluid film and the seal rings are computed, as they are the elastic and thermal distortions of the rings. Numerical analysis is carried out on a gas spiral groove face seal taking into account of choked flow effect. Analysis results show that both elastic and thermal distortions induce strong influence on the geometry of the fluid film, forming obvious divergent clearance which leads to significant decrease of minimum equilibrium clearance, exceeding 50% in degree. Thermal distortion may induce the same influence degree as elastic distortion on the minimum equilibrium clearance in high pressure cases, but the rotation speed has no obvious influence on the minimum clearance when both elastic and thermal distortions are considered. The thermal distortion as well as elastic distortion should be concerned in high pressure analysis.

Copyright © 2015 by ASME
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References

Figures

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Fig. 1

Schematic of spiral face gas seal and thermal boundary conditions

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Fig. 2

Variation of N2 viscosity with pressure under different temperature

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Fig. 3

Mechanical boundary conditions

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Fig. 4

Algorithm of the program

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Fig. 5

Comparison between experimental and numerical result

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Fig. 6

Fields of gas pressure and temperature without face distortions considered (β = 18 deg, h0 = 5 μm, and ω = 10,000 r/min)

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Fig. 7

Cross-sectional temperature fields of sealing film and rings (β = 18 deg, h0 = 5 μm, and ω = 10,000 r/min)

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Fig. 8

Influence of sealed pressure on exit Mach number and exit pressure (β = 18 deg, h0 = 5 μm, and ω = 10,000 r/min)

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Fig. 9

Exit Mach number and exit pressure versus minimum clearance (ω = 10,000 r/min)

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Fig. 10

Pressure profile along the centerline of a periodic computing region (β = 18 deg and ω = 10,000 r/min)

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Fig. 11

Opening force versus clearance (ω = 10,000 r/min)

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Fig. 12

Leakage versus clearance (ω = 10,000 r/min)

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Fig. 13

Profiles of the clearance along the centerline of a periodic computing region when elastic distortions are considered (po = 10 MPa and ω = 10,000 r/min)

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Fig. 14

Pressure profiles along the centerline of a periodic computing region when elastic distortions are considered (po = 10 MPa and ω = 10,000 r/min)

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Fig. 15

Temperature field in the fluid film when elastic distortions are considered (horing = 7.5 mm, po = 10 MPa, and ω = 10,000 r/min)

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Fig. 16

Minimum equilibrium clearance versus sealed pressure when elastic distortions are considered (ω = 10,000 r/min)

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Fig. 17

Profiles of the clearance when thermal distortions are considered (horing = 2.5 mm and ω = 10,000 r/min)

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Fig. 18

Temperature field in the fluid film when thermal distortions are considered (horing = 2.5 mm, po = 10 MPa, and ω = 10,000 r/min)

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Fig. 19

Minimum equilibrium clearance versus rotation speed for several sealed pressures when thermal distortions are considered (horing = 2.5 mm)

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Fig. 20

Profiles of the clearance when elastic and thermal distortions are considered (horing = 2.5 mm and po = 10 MPa)

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Fig. 21

Pressure profiles when elastic and thermal distortions are considered (horing = 2.5 mm and po = 10 MPa)

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Fig. 22

Temperature field in the fluid film when elastic and thermal distortions are considered (horing = 2.5 mm, po = 10 MPa, and ω = 10,000 r/min)

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Fig. 23

Minimum equilibrium clearance versus rotation speed for several sealed pressures when elastic and thermal distortions are considered

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