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Research Papers: Hydrodynamic Lubrication

Comparison of the Load-Carrying Performance of Mechanical Gas Seals Textured With Microgrooves and Microdimples

[+] Author and Article Information
Liping Shi

College of Mechanical and
Electrical Engineering,
Nanjing University of Aeronautics
and Astronautics,
Nanjing 210016, China;
College of Mechanical Engineering,
Anhui University of Technology,
Ma'anshan 243002, China

Xiuying Wang, Xiao Su, Wei Huang

College of Mechanical and
Electrical Engineering,
Nanjing University of Aeronautics
and Astronautics,
Nanjing 210016, China

Xiaolei Wang

College of Mechanical and
Electrical Engineering,
Nanjing University of Aeronautics
and Astronautics,
Nanjing 210016, China
e-mail: wxl@nuaa.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 28, 2015; final manuscript received August 13, 2015; published online October 15, 2015. Assoc. Editor: Jordan Liu.

J. Tribol 138(2), 021701 (Oct 15, 2015) (7 pages) Paper No: TRIB-15-1032; doi: 10.1115/1.4031435 History: Received January 28, 2015; Revised August 13, 2015

The effects of microgrooves and microdimples on the load-carrying performance of mechanical gas seals are compared in this study. Numerical model based on the Reynolds equation for compressible Newtonian fluid is utilized to investigate the load-carrying performance including the hydrodynamic pressure, the load-carrying force, and gas film stiffness of the gas seals. The results indicate that both microgrooves and microdimples can improve the load-carrying performance of mechanical gas seals, particularly under a small clearance condition. Furthermore, different texture patterns achieve optimal load-carrying performance at different area density, seal clearance, and depth: microgrooves with a low area density can obtain higher load-carrying force and gas film stiffness than the dimple patterns, but with high area density, elliptical dimples yield better load-carrying performance than the groove patterns.

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Figures

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Fig. 1

Schematic diagram of a mechanical gas seal

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Fig. 2

The geometrical model of texture patterns: (a) elliptical dimples, (b) circular dimples, (c) microgrooves 1, and (d) microgrooves 2

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Fig. 3

Dimensionless pressure distribution at SP = 23.60%, δ = 0.02, and ε = 0.04 for different texture patterns: (a) elliptical dimples, (b) circular dimples, (c) microgrooves 1, and (d) microgrooves 2

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Fig. 4

Effect of area density, SP, on the load-carrying force, F: (a) δ = 0.01, ε = 0.02 and (b) δ = 0.025, ε = 0.02

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Fig. 5

Effect of dimensionless seal clearance, δ, on the load-carrying force, F: (a) ε = 0.005, SP = 7.70% and (b) ε = 0.035, SP = 39.10%

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Fig. 6

Effect of dimensionless aspect ratio, ε, on the load-carrying force, F: (a) δ = 0.001, SP = 7.70% and (b) δ = 0.025, SP = 39.10%

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Fig. 7

Effect of area density, SP, on gas film stiffness, K: (a) δ = 0.01, ε = 0.02 and (b) δ = 0.025, ε = 0.02

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Fig. 8

Effect of dimensionless seal clearance, δ, on gas film stiffness, K: (a) ε = 0.005, SP = 7.70% and (b) ε = 0.035, SP = 39.10%

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Fig. 9

Effect of dimensionless aspect ratio, ε, on gas film stiffness, K: (a) δ = 0.001, SP = 7.70% and (b) δ = 0.025, SP = 39.10%

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