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Research Papers: Applications

A Thermohydrodynamic Analysis of the Self-Lubricating Bearings Applied in Gear Pumps Using Computational Fluid Dynamics Method

[+] Author and Article Information
Jintao Mo, Xiaohong Pan

Institute of Advanced Manufacturing Engineering,
Zhejiang University,
38 Zheda Road,
Hangzhou, Zhejiang 310027, China

Chaohua Gu

Institute of Chemical Machinery Engineering,
Zhejiang University,
38 Zheda Road,
Hangzhou, Zhejiang 310027, China

Shuiying Zheng

Institute of Chemical Machinery Engineering,
Zhejiang University,
38 Zheda Road,
Hangzhou, Zhejiang 310027, China
e-mail: zhengshuiying@zju.edu.cn

Guangyao Ying

Electric Power Scientific Research Institute of
Zhejiang Province,
State Grid Corporation of China,
Hangzhou, Zhejiang 310027, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received October 7, 2016; final manuscript received April 12, 2017; published online July 21, 2017. Assoc. Editor: Alan Palazzolo.

J. Tribol 140(1), 011102 (Jul 21, 2017) (9 pages) Paper No: TRIB-16-1314; doi: 10.1115/1.4036835 History: Received October 07, 2016; Revised April 12, 2017

The transient simulation of the journal bearing temperature in the internal gear pumps is hard due to the complicated shaft motion caused by the complicated loads. In this paper, a thermohydrodynamic analysis method, based on dynamic mesh techniques, is presented with the application of the general computational fluid dynamics (CFD) code fluent. This method can simulate the complex whirling orbit induced temperature variation in internal gear pumps and has taken into account the conduction in the rotating and orbiting rotor of a hydrodynamic bearing. A test rig has been built according to the structure of an internal gear pump to carry out the validation. The results show that the model is reliable. The relationship between bearing temperature, leakage, and axial clearance in the internal gear pump has been studied. It is found that the bearing temperature will decrease slightly, while the leakage increases heavily with larger axial clearance. A thermohydrodynamic analysis of the self-lubricating bearing in the internal gear pump has been done based on this method. The results show that the pressure profile changes regularly with the whirling motion of the journal, while the whirling motion has little effect on the distribution of the temperature. Besides, the increase of the whirling radius will result in the decrease of the pressure profile and the increase of the temperature profile.

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References

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Figures

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Fig. 1

The structure of the internal gear pump

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Fig. 2

The description of the test rig: (a) the photo of the test rig, (b) the Unigraphics (UG) NX model of the test rig, and (c) structure comparison

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Fig. 3

The mesh model of the internal gear pump

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Fig. 4

Thermohydrodynamic analysis method description

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Fig. 5

The description of the dynamic method

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Fig. 6

The validation simulation model description

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Fig. 7

Measured and predicted temperature at different speeds

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Fig. 8

Measured and predicted temperature at different offsets (2400 r/min)

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Fig. 9

Bearing temperature distribution at different axial gaps (offset = 18 μm)

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Fig. 10

Axial gap temperature distribution at different offsets

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Fig. 11

The description of the journal whirling motion

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Fig. 12

The pressure profile with different α (radius = 5 μm)

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Fig. 13

The temperature distribution (radius = 5 μm): (a) the temperature profile with different α and (b) the maximum temperature with different α

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Fig. 14

The pressure profile comparison with different radius

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Fig. 15

The temperature profile comparison with different radius

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