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Research Papers: Elastohydrodynamic Lubrication

A Starved Mixed Elastohydrodynamic Lubrication Model for the Prediction of Lubrication Performance, Friction and Flash Temperature With Arbitrary Entrainment Angle

[+] Author and Article Information
Wei Pu

School of Aeronautics and Astronautics,
Sichuan University,
Chengdu 610065, China
e-mail: Pweiscu@163.com

Dong Zhu

Center for Ship Engineering Tribology,
Harbin Engineering University,
Harbin 150001, China

Jiaxu Wang

School of Aeronautics and Astronautics,
Sichuan University,
Chengdu 610065, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 5, 2017; final manuscript received August 2, 2017; published online October 19, 2017. Assoc. Editor: Liming Chang.

J. Tribol 140(3), 031501 (Oct 19, 2017) (12 pages) Paper No: TRIB-17-1173; doi: 10.1115/1.4037844 History: Received May 05, 2017; Revised August 02, 2017

In this study, a modified mixed lubrication model is developed with consideration of machined surface roughness, arbitrary entraining velocity angle, starvation, and cavitation. Model validation is executed by means of comparison between the obtained numerical results and the available starved elastohydrodynamic lubrication (EHL) data found from some previous studies. A comprehensive analysis for the effect of inlet oil supply condition on starvation and cavitation, mixed EHL characteristics, friction and flash temperature in elliptical contacts is conducted in a wide range of operating conditions. In addition, the influence of roughness orientation on film thickness and friction is discussed under different starved lubrication conditions. Obtained results reveal that inlet starvation leads to an obvious reduction of average film thickness and an increase in interasperity cavitation area due to surface roughness, which results in significant increment of asperity contacts, friction, and flash temperature. Besides, the effect of entrainment angle on film thickness will be weakened if the two surfaces operate under starved lubrication condition. Furthermore, the results show that the transverse roughness may yield thicker EHL films and lower friction than the isotropic and longitudinal if starvation is taken into account. Therefore, the starved mixed EHL model can be considered as a useful engineering tool for industrial applications.

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Figures

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Fig. 1

Flowchart for the numerical procedure

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Fig. 2

Comparison of film thickness, pressure and variable θ between present results and Wijnant's data: (a) film thickness distributions, (b) pressure distributions, and (c) variations of parameter θ

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Fig. 3

Comparison between present simulation results and experimental data from Ref. [28]

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Fig. 4

Comparison between present simulation results and those by Wedeven et al. [25], and Hamrock and Dowson [32]

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Fig. 5

Three-dimensional Honed surface topography

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Fig. 6

Pressure distributions influenced by cavitation treatments

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Fig. 7

Variations of average film thickness and contact load ratio with different cavitation treatments as functions of inlet oil layer thickness

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Fig. 8

Film thickness and pressure distributions affected by inlet oil layer thickness

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Fig. 9

Central and minimum film thicknesses as functions of inlet oil layer thickness

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Fig. 10

Pressure distributions influenced by inlet oil layer thickness

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Fig. 11

Flash temperature distributions with rough surfaces influenced by inlet oil layer thickness

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Fig. 12

Variations of average film thickness and friction as functions of inlet oil layer thickness in case of rough surfaces

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Fig. 13

Three types of rough surfaces (Adapted from Ref. [42])

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Fig. 14

Pressure distribution with different surface topography and inlet oil layer thicknesses

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Fig. 15

λ Ratio and contact load ratio with rough surfaces as functions of inlet oil layer thickness

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Fig. 16

Flash temperature distributions with different rough surfaces and inlet oil layer thicknesses

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Fig. 17

Flash temperature distributions along the x-axis with transverse roughness

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