滑动轴承中不凝结气体对转子性能影响研究
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摘要
针对滑动轴承现场使用时,不凝结气体(Non-condensable gases,NCG)使润滑介质物性参数偏离标称性能的问题,首先,建立了滑动轴承内部液态-气态润滑介质-NCG组成的多相润滑流场数值模型,其次,通过自编程序实现了瞬态润滑流场与转子动力学方程之间的耦合计算,再次,通过计算与试验结果的对比说明了计算方法的有效性,最后,分析了NCG含量对于转子工作性能的影响。结果表明:NCG含量对于转子工作状态有明显影响。随着NCG含量的增加,转子静平衡位置逐渐下降,转子涡动轨迹逐渐变大,因此使得轴瓦与轴颈接触风险增加。静平衡位置处最高压力上升,高压区面积减小,空化范围加大,增加了轴瓦疲劳和气蚀的风险;NCG含量增加会引起切向油膜力做功增大,有助于提高转子稳定性。
Existence of non-condensable gases(NCG)results that lubricant parameters deviate from the nominal performance when journal bearings are used.For this investigation,a numerical model of multiphase lubricant flow field composed of liquid lubricant-gaseous lubricant-NCG in journal bearings is established.Then,the coupling calculation between transient lubricant flow field and rotor dynamic equation is realized by self-programming.The validity of the calculation method is illustrated by comparing the calculated results with the experimental ones.Finally,the influence of NCG content on the performance of the rotor is analyzed.The results show that the NCG content has a considerable effect on the working state of the rotor.With the increase of NCG content,the static equilibrium position of the rotor decreases,and the whirling orbit of the rotor increases gradually,which increases the contact risk between bearing bush and journal.The maximum pressure at the static equilibrium position rises,the area of high pressure zone decreases,and the cavitation range increases,which increases the risk of bearing bush fatigue and cavitation.Meanwhile,the increase of NCG content will increase the work of tangential oil film force and help to improve the stability of the rotor.
Existence of non-condensable gases(NCG)results that lubricant parameters deviate from the nominal performance when journal bearings are used.For this investigation,a numerical model of multiphase lubricant flow field composed of liquid lubricant-gaseous lubricant-NCG in journal bearings is established.Then,the coupling calculation between transient lubricant flow field and rotor dynamic equation is realized by self-programming.The validity of the calculation method is illustrated by comparing the calculated results with the experimental ones.Finally,the influence of NCG content on the performance of the rotor is analyzed.The results show that the NCG content has a considerable effect on the working state of the rotor.With the increase of NCG content,the static equilibrium position of the rotor decreases,and the whirling orbit of the rotor increases gradually,which increases the contact risk between bearing bush and journal.The maximum pressure at the static equilibrium position rises,the area of high pressure zone decreases,and the cavitation range increases,which increases the risk of bearing bush fatigue and cavitation.Meanwhile,the increase of NCG content will increase the work of tangential oil film force and help to improve the stability of the rotor.
引文
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[19]Gao G,Yin Z,Jiang D,et al.Analysis on Design Parameters of Water-lubricated Journal Bearings under Hydrodynamic Lubrication[J].Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology,2016,230(8):1019-1029
[20]钟一谔.转子动力学[M].北京:清华大学出版社,1987ZHONG Yie.Rotor Dynamics[M].Beijing:Tsinghua University Press,1987
[2]杨雨谋,冯明.难溶气体对水润滑轴承特性影响分析[J].工程科学学报,2017,39(11):1709-1717YANG Yumou,FENG Ming.Influence of Undissolved Gas on the Characteristics of High-speed Water-lubricated Bearings[J].Chinese Journal of Engineering,2017,39(11):1709-1717
[3]王进礼.油气润滑滑动轴承输运特性及润滑技术研究[D].哈尔滨:哈尔滨工程大学,2014WANG Jinli.Investigation on Transport Properties and Lubrication of Oil Air Lubrication in Journal Bearing[D].Harbin:Harbin Engineering University,2014
[4]曾群锋,刘成,张进华.高速轴承油气润滑系统的研究及应用现状[J].润滑与密封,2015,40(3):103-108ZENG Qunfeng,Liu Cheng,Zhang Jinhua.Application Status and Study of Oil-air Lubrication System for High Speed Rolling Bearing[J].Lubrication Engineering,2015,40(3):103-108
[5]孔祥东,姚静,俞滨,等.油气润滑系统发展综述[J].润滑与密封,2012,37(6):91-95KONG Xiangdong,YAO Jing,YU Bin,et al.Summary of Oil-air Lubrication System Development[J].Lubrication Engineering,2012,37(6):91-95
[6]郭瑞,赵国瑶,王志芳,等.润滑油中不凝结气体对滑动轴承间隙流场特性影响研究[J].机械工程学报,2016,52(12):152-157GUO Rui,ZHAO Guoyao,WANG Zhifang,et al.Studies on the Influence of Non-condensable Gas Contended in Lubricating Oil on Performance of Hydrodynamic Journal Bearing[J].Journal of Mechanical Engineering,2016,52(12):152-157
[7]Concli F.Pressure Distribution in Small Hydrodynamic Journal Bearings Considering Cavitation:A Numerical Approach Based on the Open-source CFD Code Openfoam[J].Lubrication Science,2016,28(6):329-347
[8]Hao Z R,Gu C W.Numerical Modeling for Gaseous Cavitation of Oil Film and Non-equilibrium Dissolution Effects in Thrust Bearings[J].Tribology International,2014,78(4):14-26
[9]Song Y,Gu C.Development and Validation of a Threedimensional Computational Fluid Dynamics Analysis for Journal Bearings Considering Cavitation and Conjugate Heat Transfer[J].Journal of Engineering for Gas Turbines and Power,2015,137(12):122502
[10]邢海波.滑动轴承润滑油物性及流场特性研究[D].南京:东南大学,2017XING Haibo.The Research on Characteristics of Lubricating Oil and Sliding Bearing Flow Field[D].Nanjing:Southeast University,2017
[11]Li Q,Zhang S,Ma L,et al.Stiffness and Damping Coefficients for Journal Bearing using the 3D Transient Flow Calculation[J].Journal of Mechanical Science and Technology,2017,31(5):2083-2091
[12]Guo Z,Hirano T,Kirk R G.Application of CFD Analysis for Rotating Machinery-Part I:Hydrodynamic,Hydrostatic Bearings and Squeeze Film Damper[J].Journal of Engineering for Gas Turbines and Power,2005,127(2):445-451
[13]Gertzos K P,Nikolakopoulos P G,Papadopoulos C A.CFD Analysis of Journal Bearing Hydrodynamic Lubrication by Bingham Lubricant[J].Tribology International,2008,41(12):1190-1204
[14]熊万里,侯志泉,吕浪,等,基于动网格模型的液体动静压轴承刚度阻尼计算方法[J].机械工程学报,2012,48(23):118-126XIONG Wanli,HOU Zhiquan,LV Lang,et al.Method for Calculating Stiffness and Damping Coefficients of Hybrid Bearings Based on Dynamic Mesh Model[J].Journal of Mechanical Engineering,2012,48(23):118-126
[15]Cheqamahi J M,Nili-Ahmadabadi M,Akbarzadeh S,et al.Numerical Analysis of Turbocharger's Bearing using Dynamic Mesh[J].Journal of Applied Fluid Mechanics,2016,9(5):2545-2557
[16]孙丹,李胜远,白伟钢,等.考虑轴颈涡动的滑动轴承动力特性数值研究[J].航空动力学报,2018,33(1):137-146SUN Dan,LI Shengyuan,BAI Weigang,et al.Numerical Study on Dynamic Characteristic of Journal Bearing Considering Journal Whirling Motion[J].Journal of Aerospace Power,2018,33(1):137-146
[17]Singhal A.Mathematical Basis and Validation of the Full Cavitation Model[J].Journal of Fluids Engineering,2002,124(3):617-624
[18]Li Q,Yu G,Liu S,et al.Application of Computational Fluid Dynamics and Fluid Structure Interaction Techniques for Calculating the 3D Transient Flow of Journal Bearings Coupled with Rotor Systems[J].Chinese Journal of Mechanical Engineering,2012,25(5):926-932
[19]Gao G,Yin Z,Jiang D,et al.Analysis on Design Parameters of Water-lubricated Journal Bearings under Hydrodynamic Lubrication[J].Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology,2016,230(8):1019-1029
[20]钟一谔.转子动力学[M].北京:清华大学出版社,1987ZHONG Yie.Rotor Dynamics[M].Beijing:Tsinghua University Press,1987
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