表面技术2025，Vol.54Issue(3)：62-70,117,10.DOI:10.16490/j.cnki.issn.1001-3660.2025.03.004
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
摘要
Abstract
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 the thickness distribution.In the entrance region,the reduced entrainment velocity led to oil accumulation,resulting in characteristic concave features in the entrance oil film.At high speed,severe leakage occurred in the exit region,leading to a noticeable decrease in film thickness.With the increasing speed,the overall film thickness gradually increased,and in comparison with the assumption of no slip,the depth of the oil film concavity at the entrance region initially increased and then decreased,while the reduction in film thickness in the exit region steadily increased.Throughout the speed increasing process,interface slip parameters exhibited a significant impact. With the increasing speed,the slipping region extended towards the entrance,the percentage of interface slip range and average slip length both increased significantly,albeit with a diminishing rate.Interface slip resulted in a capacity increase in the slipping region,showing a slight increase followed by a significant decrease.Moreover,as the speed continued to increase,the percentage of interface slip range,average slip length,and slipping region capacity tended to stabilize. The ultimate conclusion indicates that the operating speed significantly affects the interface slip,thereby causing changes in elastohydrodynamic lubrication characteristics.An increase in the amount of slip leads to a decline in load-carrying capacity,accelerating the failure of the mechanical system.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Key words
interface slip/point contact/elastohydrodynamic lubrication/ultimate shear force/slip length/entrance concavity分类
交通工程引用本文复制引用
郭闯,赵二辉,权龙,汪成文..速度对油膜界面滑移及弹流润滑特性的影响[J].表面技术,2025,54(3):62-70,117,10.基金项目
国家自然科学基金(52005359) （52005359）
中国博士后科学基金(2019M661062) （2019M661062）
山西省青年科学基金(201901D211021) National Natural Science Foundation of China(52005359) （201901D211021）
China Postdoctoral Science Foundation(2019M661062) （2019M661062）
Shanxi Province Science Foundation for Youths(201901D211021) （201901D211021）
