非牛顿流体润滑表面织构端面机械密封性能分析  

Performance Analysis of Mechanical Seal with Surface Texture Under Non-Newtonian Fluid Lubrication

作　　者：于博 宋勇[1] 赵伟刚[1] 常涛[1] YU Bo;SONG Yong;ZHAO Weigang;CHANG Tao(Xi′an Aerospace Propulsion Institute,Xi′an Shaanxi 710100,China)

机构地区：[1]西安航天动力研究所,陕西西安710100

出　　处：《润滑与密封》2024年第12期152-159,共8页Lubrication Engineering

摘　　要：为研究润滑介质的非牛顿流变特性对表面织构型端面机械密封性能的影响,建立考虑液膜空化和非牛顿流体效应的修正Reynolds控制方程,探讨椭圆、菱形、圆形和方形等不同形状织构孔于不同幂律指数下机械密封端面的膜压特性、泵送回流特性和承载性能。结果表明:随着幂律指数增大,由于润滑介质的增稠流变特性,使得不同织构液膜的最大压力峰值和空化区均有所提高;相比较于圆形和方形织构孔,菱形和椭圆形织构孔具有更好的泵送效应,可以调整倾斜角来自由控漏反输,但承载能力较弱;高幂律指数下4种织构的泵送率均有所提高,圆形和方形织构孔的承载力略微增大,而菱形和椭圆形织构孔的承载力明显降低。In order to study the influence of the non-Newtonian rheological properties of the lubricating medium on the performance of the surface textured end-face mechanical seal,a modified Reynolds governing equation considering liquid film cavitation and non-Newtonian fluid effect was established.The steady-state film pressure characteristics,pumping backflow characteristics and load-carrying performance of the mechanical seal end face under different power-law indexes of textured dimples with different shapes such as ellipse,diamond,circle and square were discussed.The results show that with the increase of the power-law index,the thickening rheological properties of the lubricating medium increase the maximum pressure peak and cavitation area of liquid films with different textures.Compared with the circular and square textured dimples,the diamond and elliptical textured dimples have better pumping effect,and the inclination angle can be adjusted to freely control leakage and reverse transport,but the bearing capacity is weaker.The pumping rates of the four textures at high power-law indexes are improved,the bearing capacity of circular and square textured dimples is slightly increased,while the bearing capacity of diamond and elliptical textured dimples is significantly reduced.

关 键 词：机械密封 非牛顿流体 表面织构 空化 密封性能 

分 类 号：TH117.2[机械工程—机械设计及理论]