Lubrication properties of Nitinol 60 alloy used as high-speed rolling bearing and numerical simulation of flow pattern of oil-air lubrication  

高速滚动轴承用TiNi60合金的润滑性能及油气润滑两相流流型的数值计算(英文)

作　　者：曾群锋[1] 赵西朦[1] 董光能[1] 吴红星[1] 

机构地区：[1]西安交通大学现代设计及转子轴承系统教育部重点实验室,西安710049

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第10期2431-2438,共8页中国有色金属学报（英文版）

基　　金：Project (2012M511993) supported by China Postdoctoral Science Foundation;Project (TPL1202) supported by the Open Fund Program of the State Key Laboratory of Traction Power, Southwest Jiaotong University, China

摘　　要：The friction and wear tests were performed using Nitinol 60 alloy pin sliding over GCr15 steel disk in a pin-on-disk tribometer system under PAO oil lubrication conditions. It was found that Nitinol 60 alloy can be lubricated well and has shown remarkable tribological performance. Average coefficient of friction （COF） of Nitinol 60 is 0.6 under dry friction; however, average COF decreases to 0.1 under PAO oil lubrication. SEM image of the worn surface shows that Nitinol 60 exhibits excellent wear resistance and the wear mechanism is mainly adhesive wear. Flow pattern of oil-air flow in oil pipe was simulated by FLUENT software with VOF model for acquiring working performance of oil-air lubrication. The optimum velocity of oil and air at the inlet was achieved, which provides the great proposal for the design of experiment of oil-air lubrication of Nitinol 60 alloy. The simulation results showed that the optimum annular flow of flow pattern was obtained when air velocity is 10 m/s and oil velocity is 0.05 m/s. The formation mechanism of annular flow was also discussed in the present study.销-盘摩擦磨损实验研究表明:TiNi60合金在PAO油润滑下具有优异的摩擦学性能,稳定阶段的平均摩擦系数由干摩擦的0.6降低到油润滑下的0.1,而且非常稳定。从SEM磨损形貌图可知:油润滑下TiNi60合金的磨损表面光滑,粘着磨损明显减弱。在实际研究中,仿真计算是获得高速滚动轴承在油气润滑下各项工作性能数据的有效方法。采用FLUENT数值计算了油-气两相流在水平管子内的流型分布,得到了最佳油、气的进口速度,为高速滚动轴承用TiNi60合金在油气润滑下的使用提供了理论依据。仿真计算结果表明:当空气速度为10m/s和油速度为0.05m/s时,可以得到最佳的环状流型分布。

关 键 词：Nitinol 60 alloy lubrication properties oil-air lubrication numerical simulation two-phase flow 

分 类 号：TG146.23[一般工业技术—材料科学与工程]