边界滑移对波箔型动压气体轴承静特性的影响

推进技术 ›› 2018, Vol. 39 ›› Issue (2): 388-395.

边界滑移对波箔型动压气体轴承静特性的影响

张镜洋¹,赵晓荣¹,常海萍²,方华²

南京航空航天大学航天学院，江苏南京 210016,南京航空航天大学航天学院，江苏南京 210016,南京航空航天大学能源与动力学院，江苏南京 210016,南京航空航天大学能源与动力学院，江苏南京 210016

发布日期:2021-08-15
作者简介:张镜洋，男，博士，副教授，研究领域为传热传质。
基金资助:
国家自然科学基金(青年)项目(51406085)；南京航空航天大学研究生创新基地(实验室)开放基金

Effects of Sliding Boundary on Static Characteristics of Aerodynamic Compliant Foil Bearing

College of Astronautics，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China,College of Astronautics，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China,College of Energy and Power Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China and College of Energy and Power Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China

Published:2021-08-15

摘要/Abstract

摘要： 为获得流固边界滑移状态对动压轴承性能的影响，以波箔型动压气体轴承为研究对象，建立极限切应力模型下不同滑移状态的气膜压力及厚度方程，利用差分迭代法耦合求解，分析不同边界滑移状态时轴承静特性随滑移相关参数的变化规律。研究结果表明:与无滑移状态相比，轴面侧滑移对轴承静特性不利，箔片侧滑移对轴承静特性有利，滑移对承载力额最大影响幅度可达20%，对偏位角的最大影响幅度可达10°；两侧均存在滑移时轴承静特性下降，影响幅度小于前两者。当轴承转速、偏心率以及润滑气体动力粘度增大时或者轴承间隙减小时，均会使滑移对承载力的影响增大、对偏位角的影响减小。

关键词: 波箔；动压气体轴承；边界滑移；极限剪应力；轴承静特性

Abstract: The status of sliding boundary between fluid and solid has significant effect on aerodynamic compliant foil bearing. The model of aerodynamic compliant foil bearing was built， whose gas film pressure and thickness equations with different sliding conditions in the fluid-solid boundaries were established in consideration of ultimate shear stress. Moreover， they were solved by iteration using finite difference method， in order to gain the variety law about the static characteristics of bearing with variation of the parameters in different sliding conditions， which are associated with sliding boundary. The results show that the static characteristics of bearing is reduced by slipping only in the journal surface and enhanced by slipping only in top foil surface compared with no slipping condition. And the slipping affects the static characteristics of bearing as much as 20% bearing capacity and 10° in the deflection angle. Moreover， the static characteristics of bearing are weakened when slipping coexists， whose degree of influence is less than the above two slipping conditions. In addition， the influence of any sliding conditions on capacity is amplified and on deflection angle is cut down， when rotation speed， eccentricity or gas dynamic viscosity increase. And the same rules occur when radius gap decreases.

Key words: Bump foil；Aerodynamic compliant foil bearing；Sliding boundary；Ultimate shear stress；Static characteristics of bearing

张镜洋,赵晓荣,常海萍,方华. 边界滑移对波箔型动压气体轴承静特性的影响[J]. 推进技术, 2018, 39(2): 388-395.

ZHANG Jing-yang¹,ZHAO Xiao-rong¹,CHANG Hai-ping²,FANG Hua². Effects of Sliding Boundary on Static Characteristics of Aerodynamic Compliant Foil Bearing[J]. Journal of Propulsion Technology, 2018, 39(2): 388-395.

参考文献

[1] 张广辉, 刘占生. 旋转冲压发动机高速动静混合气体轴承性能分析[J]. 推进技术, 2009, 30(5): 610-617. (ZHANG Guang-hui, LIU Zhan-sheng. Performance Analysis of High-Speed Hybrid Gas Bearings for Rotating Ram Jet[J]. Journal of Propulsion Technology, 2009, 30(5): 610-617.)
[2] 虞烈, 刘恒. 轴承-转子系统动力学[M]. 西安:西安交通大学出版社, 2001.
[3] Gans R F. Lubrication Theory at Arbitrary Knudsen Number[J]. Journal of Tribology, 1985, 107(3): 43l-433.
[4] Fukuis, Kaneko R. Analysis of Ultra-Thin Gas Film Lubrication Based on Linearized Boltzmann Equation: First Report Derivation of a Generalized Lubrication Equation Including Thermal Creep Flow[J]. Journal of Tribology, 1988, 110: 253-262.
[5] Mitsuya Y. Modified Reynolds Equation for Ultra-Thin Film Gas Lubrication Suing 1.5-Order Slip-Flow Model and Considering Surface Accommodation Coefficient[J].Journal of Tribology, 1993, 115(2): 289-294.
[6] Lee Y B, Kwak H D, Kim C H, et al. Numerical Prediction of Slip Flow Effect on Gas-Lubricated Journal Bearings for MEMS/MST-Based Micro-Rotating Machinery[J]. Tribology International, 2005, 38: 89-96.
[7] Ma G J, Wu C W, Zhou P. Wall Slip and Hydrodynamics of Two-Dimensional Journal Bearing[J]. Tribology International, 2007, 40: 1056-1066.
[8] 黄海, 孟光, 赵三星. 二阶滑移边界对微型气浮轴承稳态性能的影响[J]. 力学学报, 2006, 38(5):668-673.
[9] 周健斌, 孟光, 张文明. 微机电系统径向气体轴承特性研究[J]. 振动与冲击, 2007, 26(9): 30-33.
[10] Guo F, Wong P L. Full and Partial Boundary Slippage Effect on Squeeze Film Bearings[J]. Tribology International, 2010, 43: 997-1004.
[11] 方华, 常海萍, 张镜洋, 等. 润滑气体及箔片材料对动压轴承动特性的影响分析[J]. 推进技术, 2014, 35(8): 1116-1122. (FANG Hua, CHANG Hai-ping, ZHANG Jing-yang, et al. Analysis of Lubrication Gas and Elastic Foil for Gas Foil Bearing Dynamic Characteristics[J]. Journal of Propulsion Technology, 2014, 35(8): 1116-1122.)
[12] 王丽丽. 高速滑动轴承的边界滑移及空穴机理研究[D]. 济南:山东大学, 2012.
[13] Carpino M, Talmage G. A Fully Coupled Finite Element Formulation for Elastically Supported Foil Journal Bearings[J]. Tribology Transactions, 2003, 46: 560-565.
[14] 吴成伟, 马国军, 周平. 流体流动的边界滑移问题进展[J]. 力学进展, 2008, 38(3): 266-277.
[15] Spikes H A. The Half-Wetted Bearing, Part 1: Extended Reynolds Equation[J]. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2003, 217: 1-14.
[16] Spikes H A. The Half-Wetted Bearing, Part 2: Potential Application in Low Load Contacts[J]. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2003, 217: 15-26.
[17] Rao TVVLN. Theoretical Prediction of Journal Bearing Stability Characteristics Based on the Extent of the SlipRegion on the Bearing Surface[J]. Tribology Transactions, 2009, 52(6): 750-758.
[18] Lez S L, Arghir M, Frene J. Static and Dynamic Characterization of a Bump-Type Foil Bearing Structure[J]. Journal of Tribology, 2007, 129(1): 75-83.(编辑:朱立影)　　　　　　　　　　　　　*　收稿日期:2016-10-13；修订日期:2017-04-10。基金项目:国家自然科学基金(青年)项目(51406085)；南京航空航天大学研究生创新基地(实验室)开放基金 (20151503)。作者简介:张镜洋,男,博士,副教授,研究领域为传热传质。E-mail: zjy@nuaa.edu.cn