基于两相流的径向滑动轴承界面滑移分析
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摘要
考虑空穴效应和轴瓦界面滑移效应,运用Fluent建立滑动轴承两相流模型,研究不同滑移区域、转速和黏度对油膜承载力及气穴分布的影响规律。研究表明:复合滑移表面比完全滑移和无滑移表面更能提高油膜压力和承载力,同时复合滑移表面能降低高体积分数空穴比例;转速增加能提高油膜压力和承载力,但油膜的高体积分数空穴比例会增加;黏度增加虽然能增加轴承承载力,但同时也加剧了发散楔区域的空化现象,使油膜稳定性下降。
Considering the cavitation effect and the interface slip of the inner wall surface of the bearing,a two-phase flow model of the sliding bearing was established with Fluent to study the influence of different slip areas,rotational speed and viscosity on the oil film bearing capacity and cavitation distribution.The results show that the compound sliding surface can improve the oil film pressure and bearing capacity better than the fully slipped and non-slip surface,and it also can reduce the proportion of high air volume fraction cavities.The increase of the rotation speed can increase the oil film pressure and bearing capacity,but the proportion of voids in the high volume fraction of the oil film will increase.Although the increase in viscosity can increase the bearing capacity of the bearing,it also aggravates the cavitation phenomenon in the divergent wedge region and decreases the stability of the oil film.
Considering the cavitation effect and the interface slip of the inner wall surface of the bearing,a two-phase flow model of the sliding bearing was established with Fluent to study the influence of different slip areas,rotational speed and viscosity on the oil film bearing capacity and cavitation distribution.The results show that the compound sliding surface can improve the oil film pressure and bearing capacity better than the fully slipped and non-slip surface,and it also can reduce the proportion of high air volume fraction cavities.The increase of the rotation speed can increase the oil film pressure and bearing capacity,but the proportion of voids in the high volume fraction of the oil film will increase.Although the increase in viscosity can increase the bearing capacity of the bearing,it also aggravates the cavitation phenomenon in the divergent wedge region and decreases the stability of the oil film.
引文
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[2]FORTIER A E.Numerical analysis of a slider bearing with a heterogeneous slip/no-slip surface[J].Tribology Transactions,2004,47(3):328-334.
[3]WU C W,MA G J,ZHOU P,et al.Low friction and high load support capacity of slider bearing with a mixed slip surface[J].Journal of Tribology,2006,128(4):904-907.
[4]WU C.Performance of hydrodynamic lubrication journal bearing with a slippage surface[J].Industrial Lubrication and Tribology,2008,60(6):293-298.
[5]张辉,张朋波,MENG Hua,等.高速水润滑径向滑动轴承的壁面滑移设计[J].西安交通大学学报,2013,47(9):72-76.ZHANG H,ZHANG P B,MENG H,et al.Boundary slip design of high speed water lubricated journal bearing[J].Journal of Xi’an Jiaotong University,2013,47(9):72-76.
[6]王荣耀.动压轧机油膜轴承空化现象研究[D].太原:太原科技大学,2013.
[7]王丽丽,尹国校,苏春建,等.基于Fluent两相流空穴模型的三油槽轴承油膜特性分析[J].润滑与密封,2017,41(9):65-69.WANG L L,YIN G X,SU C J,et al.Research on oil film characteristics of three oil groove journal bearing based on two phase modal fluent[J].Lubrication Engineering,2017,41(9):65-69.
[8]罗赞.基于粘温效应的流体动压滑动轴承流场及传热分析[D].湘潭:湘潭大学,2016.
[9]张楚,杨建刚,郭瑞,等.基于两相流理论的滑动轴承流场计算分析[J].中国电机工程学报,2010,30(29):80-84.ZHANG C,YANG J G,GUO R,et al.Simulation of journal bearing flow field using computational fluid dynamics two phase flow theory[J].Proceeding of the CSEE,2010,30(29):80-84.
[10]孙丹,张楚,郭瑞,等.基于两相流理论滑动轴承动力特性求解[J].航空动力学报,2012,27(12):2821-2827.SUN D,ZHANG C,GUO R,et al.Solution of dynamic characteristics of journal bearing based on two phase flow theory[J].Journal of Aerospace Power,2012,27(12):2821-2827.
[11]黄雅成,姚廷强,付圆宁.不同参数对滑动轴承动态特性的影响分析[J].昆明理工大学学报(自然科学版),2015(2):61-66.HUANG Y C,YAO T Q,FU Y N.Analysis of influence of different parameters on dynamic characteristics of sliding bearing[J].Journal of Kunming University of Science and Technology(Natural Science Edition),2015(2):61-66.
[12]吉宏斌,王建梅,麻扬.考虑气穴影响的椭圆轴承油膜压力场研究[J].润滑与密封,2016,41(1):64-69.JI H B,WANG J M,MA Y.Research on oil-film pressure field of elliptic oil-film bearings with considering cavitation effect[J].Lubrication Engineering,2016,41(1):64-69.
[13]LUIS S.Cavitation in liquid film bearings[EB/OL].[2012-02-19].Http://www.Users/Administrator/App Data/Roaming/360se/WebCache/PDF/PdfTemplate.html.