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research-article

A thermohydrodynamic analysis of the self-lubricating bearings applied in gear pumps using CFD method

[+] Author and Article Information
Mo Jintao

Institute of Advanced Manufacturing Engineering, Zhejiang University, Hangzhou, PR China
mojintao@126.com

Gu Chaohua

Institute of Chemical Machinery Engineering, Zhejiang University, Hangzhou, PR China
guchaohua128@126.com

Pan Xiaohong

Institute of Advanced Manufacturing Engineering, Zhejiang University, Hangzhou, PR China
panxiaohong128@126.com

Zheng Shuiying

Institute of Chemical Machinery Engineering, Zhejiang University, Hangzhou, PR China
zhengshuiying128@126.com

Ying Guangyao

Electric Power Scientific Research Institute of Zhejiang Province, State Grid Corporation of China, Hangzhou, PR China
yingguangyao128@126.com

1Corresponding author.

ASME doi:10.1115/1.4036835 History: Received October 07, 2016; Revised April 12, 2017

Abstract

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 thermo-hydrodynamic analysis method, based on dynamic mesh techniques, is presented with the application of the general 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 thermo-hydrodynamic 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.

Copyright (c) 2017 by ASME
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