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Research Papers: Elastohydrodynamic Lubrication

The Effect of Oil Droplet on the Lubrication Performance

[+] Author and Article Information
Shengguang Zhang

School of Mechanical Engineering,
Beijing Institute of Technology,
Beijing 100081, China

Wenzhong Wang

School of Mechanical Engineering,
Beijing Institute of Technology,
Beijing 100081, China
e-mail: wangwzhong@bit.edu.cn

Xinming Li, Feng Guo

School of Mechanical Engineering,
Qingdao Technological University,
Qingdao, Shandong 266033, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 14, 2015; final manuscript received January 5, 2016; published online May 4, 2016. Assoc. Editor: Xiaolan Ai.

J. Tribol 138(3), 031506 (May 04, 2016) (9 pages) Paper No: TRIB-15-1195; doi: 10.1115/1.4032959 History: Received June 14, 2015; Revised January 05, 2016

Oil–air lubrication is widely used in the high-speed rotary machines; the oil is usually in the form of discrete droplets. The lubrication behavior of the oil droplet is rarely investigated. This paper investigates the effect of the oil droplet on lubrication performance based on the developed transient lubrication model with consideration of starvation conditions. The oil droplet is modeled as spherical segment with different heights, base radius, and positions, which will change the inlet oil supply conditions. The results show that the oil droplet with large size can generate thick oil film which is close to the one in fully flooded condition and can remain long time; the position of the oil droplet entering the contact region also has significant effect on the lubrication performance.

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Figures

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Fig. 1

The measurement of oil droplets after injecting from air–oil mixer (a) and its modeling (b)

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Fig. 2

The average film thickness and its derivative

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Fig. 3

The average oil film thickness and duration of the fully flooded phase for different radii of oil droplets: (a) the average oil film thickness distribution along the time and (b) duration exceed 94.77% of the fully flooded phase

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Fig. 4

The contact area ratio for different radii of oil droplets

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Fig. 5

The average oil film thickness for oil droplet with different heights and the same base radius r = 0.6a

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Fig. 6

The change of average film thicknesses when the droplet enters the contact zone from different positions

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Fig. 7

The film thickness and pressure profiles along the centerline and contour plots of film thickness at different instants for oil droplet positioned at y = 0

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Fig. 8

The film thickness and pressure profiles along the centerline and contour plots of film thickness at different instants with different entering positions of oil droplet. (a) The results for oil droplet positioned at y = 0.5a. (b) The results for oil droplet positioned at y = a.

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Fig. 9

Contour plots of film thickness obtained from (a) experiment and (b) simulation

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Fig. 10

Comparison of film thickness profiles at different instants between experiment and simulation: (a) droplet entering the contact region and (b) droplet leaving the contact region

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