内螺纹织构深度对涡轮增压器浮环轴承油膜动态特性的影响  

Effect of Inner Thread Texture Depth on Oil Film Dynamic Characteristics of Turbocharger Floating Ring Bearing

作　　者：姜璟珺 杨峰 刘泽中 宾光富[1] JIANG Jingjun;YANG Feng;LIU Zezhong;BIN Guangfu(School of Mechanical and Electrical Engineering,Hunan University of Science and Technology,Xiangtan Hunan 411201,China;VOFON Turbo Systems(Ningbo)Co.,Ltd.,Ningbo Zhejiang 315336,China)

机构地区：[1]湖南科技大学机电工程学院,湖南湘潭411201 [2]宁波丰沃涡轮增压系统有限公司,浙江宁波315336

出　　处：《润滑与密封》2022年第10期78-83,共6页Lubrication Engineering

基　　金：国家自然科学基金项目(52075165);湖南省自然科学基金项目(2019140084);湖南省教育厅科学研究重点项目(19A171);湖南省科技创新领军人才项目(2020RC4039)。

摘　　要：浮环轴承内螺纹织构深度会改变织构区域油膜厚度,导致浮环轴承油膜动态特性变化,从而影响涡轮增压器转子-轴承系统运行稳定性以及工作寿命。基于流体润滑理论,推导含表面织构的浮环轴承油膜控制方程,揭示内螺纹织构深度与浮环轴承油膜特性之间的关系。以某型涡轮增压器浮环轴承为例,分析内螺纹织构深度对轴承油膜最大压力、油膜承载力、刚度、阻尼等的影响。建立浮环轴承双油膜润滑分析流体动力学模型,利用CFD方法对油膜动态特性进行分析,研究织构深度从6μm增至12μm时的油膜特性。结果表明:在轴颈转速1×10^(3)~2.1×10^(5) r/min范围内,随着织构深度的增加,油膜最大压力、内外油膜承载力、刚度阻尼系数呈现先增大后减小的趋势;在转速超过1×10^(5) r/min后,织构对油膜动态特性系数提升更明显;与无织构轴承相比,织构深度为8μm时,油膜承载力、刚度阻尼等动态特性提升最大。研究表明,在合适的织构深度下,织构可以改善油膜特性,提升轴承的运转稳定性,延长工作寿命。The texture depth of the inner thread of the floating ring bearing can change the oil film thickness in the texture area,resulting in the change of the dynamic characteristics of the oil film of the floating ring bearing,thus affecting the operating stability and working life of the turbocharger rotor-bearing system.Based on the fluid lubrication theory,the governing equation of oil film of floating ring bearings with surface texture was derived,and the relationship between the texture depth of inner thread and the oil film characteristics of floating ring bearing was revealed.Taking a certain turbocharger floating ring bearing as an example,the effect of the texture depth of the inner thread on the maximum oil film pressure,oil film bearing capacity,stiffness and damping of the bearing was analyzed.A dual oil film lubrication model of the floating ring bearing was established,the dynamic characteristics of the oil film was analyzed by CFD method,and the characteristics of the oil film were studied when the texture depth increases from 6μm to 12μm.The results show that the maximum oil film pressure,the bearing capacity of inner and outer oil film,the stiffness and damping coefficient increase first and then decrease with the increase of texture depth in the range of journal rotation speed from 1×10^(3)r/min to 2.1×10^(5)r/min.The effect of texture on dynamic characteristic coefficient of oil film is more obvious when the speed exceeds 1×10^(5)r/min.Compared with the non-textured bearing,the dynamic characteristics such as oil film bearing capacity,stiffness and damping have the largest improvement when the texture depth is 8μm.It is concluded that under the proper texture depth,the texture can improve the oil film characteristics,improve the running stability of the bearing and prolong the working life.

关 键 词：浮环轴承 表面织构 流体动力学模型 动态特性 刚度 阻尼 

分 类 号：TH133.3[机械工程—机械制造及自动化]