摘要
表面微孔结构在剪切作用下诱发流体产生附加动压效应,提升流体膜承载能力,促使摩擦配合端面间维持流体润滑,改善摩擦性能。以6种不同微孔表面为研究对象,考虑端面弹性变形影响,开展无压工况下动压润滑特性的比较研究,数值分析平衡基础膜厚、流体流量、摩擦转矩、摩擦系数等性能参数随操作条件与孔型参数变化规律,并以最优动压特性与摩擦性能为目标,给定不同孔型参数的优化范围。结果表明:弹性变形与流体膜厚度相对应,轴向压缩变形越大,润滑间隙尺寸越大,膜厚越厚。相比于平衡基础膜厚,端面变形对膜厚分布影响微弱。在微孔倾斜角0~20°范围内,椭圆微孔与矩形微孔动压效应最为显著,且摩擦系数、摩擦转矩较小,优势较为明显。在孔深为4~6μm、方向因子为2时,不同形状孔型结构润滑性能均可达到最佳效果。
The hydrodynamic effect of surface dimples induced by the shear flow enhances the load capacity of fluid film;which maintains the hydrodynamic lubrication between sliding surfaces and improves the friction performance.Considering the elastic deformation at zero pressure;the hydrodynamic performances of six dimpled surfaces are compared;and then the laws of performance parameters such as the equilibrium film thickness;the flow rate;the friction torque and the friction coefficient;etc.changing with operation conditions and hole pattern is obtained by numerical analysis.Finally;the optimization range of different hole parameters is determined with the objective of the optimal dynamic pressure and friction performance.The results show that elastic deformation has positive correlation with film thickness;the larger axial compression deformation;the larger lubrication clearance namely the film thickness.Compared with the equilibrium foundation film thickness;the influence of end face deformation on the film thickness distribution is weak.The ellipse and rectangle dimples with the inclination angle of 0~20°generate more significant hydrodynamic effect;as well as the smaller friction torque and friction coefficient.When the hole depth is 4~6μm and the direction factor is 2;the lubrication performance of different shape hole structure can achieve the best effect.
作者
丁少鹏
徐嘉
史正良
刘鹏飞
关蕴奇
DING Shao-peng;XU Jia;SHI Zheng-liang;LIU Peng-fei;GUAN Yun-qi(National Engineering Research Center of Green Refrigeration Equipment, Zhuhai, Guangdong 519070;Gree Electric Appliances, Inc. of Zhuhai, Zhuhai, Guangdong 519070)
出处
《液压与气动》
北大核心
2020年第7期118-126,共9页
Chinese Hydraulics & Pneumatics
基金
广东省基础与应用基础研究基金(2020A1515011386)。
关键词
微孔端面
动压效应
润滑特性
压缩机
surface dimples
hydrodynamic effect
lubrication performance
compressor
