Analysis of aeroengine fuel pump hydrostatic journal bearing lubrication and parameter influence

被引：0
作者：
Fu, Jiangfeng [1 ,2 ]
Zhong, Shijie [1 ,2 ]
Luo, Kang [1 ,2 ]
Liu, Xianwei [1 ,2 ]
Wei, Shijie [1 ,3 ]
机构：
[1] School of Power and Energy, Northwestern Polytechnical University, Xi’an
[2] Advanced Power Research Institute, Northwesterm Polytechnical University, Sichuan Tianfu New Area, Chengdu
[3] AECC Xi’an Engine Control Technology Company, Xi’an
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2025年 / 46卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Aeroengine; Fuel gear pump; Lubrication; Oil film test; Sliding bearing;
D O I：
10.13675/j.cnki.tjjs.2309035
中图分类号：
学科分类号：
摘要：
The journal bearing of aero-engine fuel gear pumps work under extreme conditions of high temperature, high pressure and low viscous media for a long time, which may result in lubrication failure. However, the evolution law of their lubrication performance has not been fully explored. This paper establishes and solves the fluid lubrication model of the fuel pump hydrostatic bearing. The oil film thickness test under actual operating conditions is conducted by using ultrasonic measurement principle, and the oil film thickness of the sliding bearing lubrication model under multiple load conditions is compared and verified. Finally, the verified sliding bearing lubrication model is used to study the influence mechanisms of width-to-diameter ratio, eccentricity and oil groove position on its lubrication performance. The research results show that the calculated oil film thickness changes with the working conditions and is in good agreement with the experimental measurement points, with an average calculation error of 2.3%. In addition, an increase in fuel pump load will cause the minimum thickness of the oil film to deflect towards the inlet oil groove, thereby weakening the dynamic pressure capacity. The bearing capacity of the bearing under high load conditions is mainly provided by static pressure. When the aspect ratio B/D increases from 0.4 to 1.2, it will cause the oil film temperature to decrease by 1.2 ℃ along the circumferential direction and increase by 0.5 ℃ along the axial direction. An increase in eccentricity will lead to a decrease in the oil film thickness, and the dynamic pressure at the middle section of the mixed lubrication bearing will increase by 0.43 MPa. The oil groove position of the sliding bearing should be designed at the front end of the converging wedge structure or at the opening of the expanding wedge structure, which can improve the bearing’s load-bearing performance. © 2025 China Aerospace Science and Industry Corp. All rights reserved.
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