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Hydrodynamic Lubrication

Cavitation Mechanism of Oil-Film Bearing and Development of a New Gaseous Cavitation Model Based on Air Solubility

[+] Author and Article Information
Xue-song Li1

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering,  Tsinghua University, Beijing 100084, People’s Republic of Chinaxs-li@mail.tsinghua.edu.cn

Yin Song, Zeng-rong Hao, Chun-wei Gu

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering,  Tsinghua University, Beijing 100084, People’s Republic of China

1

Corresponding author.

J. Tribol 134(3), 031701 (Jun 12, 2012) (7 pages) doi:10.1115/1.4006702 History: Received June 16, 2011; Revised April 15, 2012; Published June 12, 2012; Online June 12, 2012

Cavitation phenomenon in lubricants significantly influences the performance of associated machinery. In this paper, the cavitation mechanism of an oil-film bearing is attributed to gaseous cavitation, and a new gaseous cavitation model based on air solubility in the lubricant is presented. The model is validated using the Reynolds equation algorithm for fixed-geometry oil-film journal bearing, and the predicted results at different eccentricity ratios show good agreement with published data. The analyses show that gaseous mechanism can explain the cavitation phenomena that occur in the bearing except for very heavy load cases. In particular, this new model is compatible with the Jakobsson–Floberg–Olsson condition. Therefore, the new model has an explicit physical meaning, can produce good results, can identify whether vaporous cavitation occurs, and more importantly, can provide a novel means of developing cavitation models for low-vapor-pressure lubricants.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Coordinate system

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Figure 2

Outline of a journal bearing

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Figure 3

Variation of load capacities with eccentricity ratios

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Figure 4

Relative errors of Fx

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Figure 5

Position of oil-film rupture

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Figure 6

Pressure contours of Case F at 1 Pa of the Reynolds cavitation model

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Figure 7

Volume fraction of air of Case F of the new cavitation model

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Figure 8

Centerline pressure profile of Case F

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Figure 9

Pressure distribution of Case F of the new cavitation model

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Figure 10

Contours of the new variable φ of Case F of the new cavitation model

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Figure 11

Centerline profile of the new variable φ of Case F of the new cavitation model

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