摘要
针对表面织构可以有效改善相对运动表面的摩擦学性能,建立了均匀分布的微凹坑机械端面密封的理论模型,采用有限差分法对流体动压润滑方程进行求解,获得了密封端面间气膜的无量纲压力分布,并考察了微凹坑形状和复合形式对密封端面的无量纲平均压力pav的影响.结果表明:微凹坑在相同的形状下,大小尺度不同的复合凹坑比单一凹坑具有更强的动压性能,而以矩形凹坑表现得最为明显,其动压性能效率提高率ξ3可达6.79%;微凹坑的复合可明显增强密封端面动压性能.
Surface texturing has been recognized to be efficient in modifying the tribological per- formances of relatively moving surface. A theoretical model of mechanical face seal within equally distributed micro-dimples was developed, the finite difference method was utilized to calculate the hydrodynamic lubrication equation and the dimensionless pressure distribution of the gas film be- tween the face seal was obtained. The effect of the the shape and mixed patterns of the micro- dimples on the average dimensionless pressure Pav of the face seal was also investigated. The re- suits showed that the mixed dimples with different scale had a better performance of dynamic pressure than the seal face which distributed with large or small dimples only under the same shape,the rectangle dimple showed most clearly effect, the improve proportion of dynamic pres- sure performance ξ3 could be reach to 6.79 %. Mixed micro-dimple can improve the hydrodynamic properties of face seal obviously.
出处
《工程设计学报》
CSCD
北大核心
2014年第6期540-544,共5页
Chinese Journal of Engineering Design
基金
安徽省研究生"千人培养计划"资助项目(20130018)
关键词
机械端面密封
有限差分法
复合凹坑
动压性能
mechanical face seal
finite difference method
mixed dimple
hydrodynamic property
