速度对油膜界面滑移及弹流润滑特性的影响  

Impact of Speed on Oil Film Interface Slip and Elastohydrodynamic Lubrication Characteristics

作　　者：郭闯 赵二辉 权龙 汪成文 GUO Chuang;ZHAO Erhui;QUAN Long;WANG Chengwen(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学机械与运载工程学院,太原030024

出　　处：《表面技术》2025年第3期62-70,117,共10页Surface Technology

基　　金：国家自然科学基金(52005359);中国博士后科学基金(2019M661062);山西省青年科学基金(201901D211021)。

摘　　要：目的研究机械系统摩擦副间相对速度的变化对润滑油膜界面滑移及弹流润滑特性的影响,为探究极限工况下机械传动系统中摩擦副润滑失效的形成和演变机理提供理论依据。方法建立考虑油膜界面滑移的点接触弹流润滑模型,并进行仿真计算,开展双色光干涉弹流润滑试验,研究速度对弹流润滑中油膜界面滑移的影响,进而研究界面滑移状态下卷吸速度、流体动压、油膜厚度、滑移参数等随速度变化的特性。结果界面滑移主要发生在润滑入口区域,滑移部位卷吸速度明显下降;界面滑移导致动压变化,二次压力峰减弱,动压分布向滑移区域偏移;界面滑移影响膜厚分布,润滑油堆积导致入口油膜凹陷,在高速工况下出口区域膜厚减小。随着速度的增大,滑移部位向入口区延伸;界面滑移范围占比与平均滑移长度均显著增大;滑移区域动压分布趋于均匀;滑移部位承载能力呈现先略有增大后显著减小的特征;滑移范围占比、平均滑移长度和滑移部位承载能力均趋于稳定。结论工况速度会对界面滑移产生显著影响,滑移量的增加导致承载能力下降,从而加速机械系统的失效。The work aims to investigate the formation and evolution mechanism of lubrication failure in mechanical transmission systems under extreme operating conditions,focusing on the effects of speed-induced variations on oil film interface slip and elastohydrodynamic lubrication(EHL)characteristics.The non-Newtonian properties of lubricating oil films and the impact of interface slip on the EHL state were comprehensively considered.A point contact EHL model considering interface slip was established,and through simulation calculations,the effect of speed on interface slip in EHL was explored.Subsequently,the variations of variables such as entrainment velocity,fluid dynamic pressure,oil film thickness,and slip parameters under different operating speeds were analyzed.In addition,a dual-color light interference point contact EHL experiment was designed and conducted to measure the distribution of oil film thickness in EHL.The oil film thickness distribution maps with interface slip were presented,validating the accuracy of the simulation calculations through comparative analysis.Interface slip primarily occurred in the entrance region of the EHL,resulting in a significant decrease in entrainment velocity at the slipping locations,with the most substantial reduction occurring near the edge of entrance region.At low speed,both the slip range and entrainment velocity decrease were relatively small.However,with the increasing speed,both parameters significantly increase.Interface slip led to a noticeable increase in dynamic pressure in the entrance region of the EHL,a significant decrease in the central region,and a slight decrease in the exit region.As the speed increased,the range and magnitude of dynamic pressure variations gradually increased,the secondary pressure peak weakened,and the overall dynamic pressure distribution tended to shift towards the slipping region,gradually becoming more uniform.Interface slip caused uneven distribution of entrainment velocity along the central axis of the EHL,subsequently affecting

关 键 词：界面滑移 点接触 弹流润滑 极限剪切力 滑移长度 入口凹陷 

分 类 号：U463.2[机械工程—车辆工程]