液体润滑分段螺旋槽端面密封性能分析

为探讨螺旋槽衍生槽型液体润滑端面密封性能,以中间开槽密封为研究对象,建立考虑质量守恒JFO空化边界条件的雷诺方程,采用有限差分法进行数值求解,对螺旋槽、二段槽以及三段槽的性能进行对比分析,探讨结构参数和操作参数对其泵送能力、动压承载能力以及空化情况的影响,计算域中槽区边界处的膜厚值采用调和平均处理。结果表明:在所给参数范围内,3种槽型的泵送率几乎均为正值,即均可实现上游泵送;三段槽的流体膜承载力受转速影响的程度明显小于另2种槽型;相同条件下三段槽更不易诱发空化,其次为二段槽;相比于螺旋槽和二段槽,三段槽受结构参数和操作参数的影响更小,具有更稳定的流体膜承载力及上游泵送性能。

On Performance of Liquid-lubricating Face Seals with Segmented Spiral Grooves

In order to explore the characteristics of the liquid lubricated face seals with derived geometries of the spiral groove,the Reynolds equation considering the mass conservation JFO cavitation boundary conditions was established based on the middle grooved face seal type and was numerically solved by the finite difference method.The performances of spiral groove,two segment groove and three segment groove were compared and analyzed,and the influence of structural parameters and operating parameters on pumping capacity,dynamic pressure bearing capacity and cavitation condition was discussed.The film thickness at the groove boundary in the calculation domain was dealt with harmonic averaging.The results show that within the given parameters,the pumping rates of three types of grooves are nearly all positive,namely achieving upstream pumping.The load carrying capacity of three segment groove is significantly less affected by the speed than the other two groove types.Three segment groove presents the lowest cavitation,followed by two segment groove.Compared with spiral groove and two segment groove,three stage groove type is less affected by structural parameters and operating parameters,and maintains more stable load carrying capacity and upstream pumping performance