摘要
分别基于Reynolds方程和N-S方程对螺旋槽式干气密封的间隙流场进行了数值研究。在改变转速、出口背压、入口压力和密封间隙的情况下,对两种方法得到的泄漏率和开启力等结果进行了对比。研究发现,随着转速、压差和密封间隙的增大,由Reynolds方程得到的结果会越来越偏离由N-S方程得到的结果。N-S方程可以正确描述堵塞流现象,但Reynolds方程则不能。但总体而言由Reynolds方程得到的密封性能结果在该文选取的工况参数范围内与由N-S方程得到的结果比较接近。从两种方程的数学和物理差异出发对这些结果进行了解释和分析,对于两种方法在干气密封性能分析中的优缺点和适用性进行了总结。
A numerical investigation was performed on a spiral-grooved dry gas seal based on Reynolds equation and Navier-Stokes equation,respectively.The seal performance such as leakage and load capacity obtained by the two methods was compared with varying operating conditions.The differences between the results obtained by Reynolds equation and by Navier-Stokes equation increase with increasing rotational speed,pressure difference and seal clearance.Numerical methods based on the Navier-Stokes equation can simulate the choked flow correctly,while methods based on the Reynolds equation can not.But for the operating condition parameters in this paper,the seal performance results obtained by the Reynolds equation are close to those by the Navier-Stokes equation.The results can be explained by the mathematical and physical differences between the two equations,with the advantages and disadvantages of the two methods analyzed and summarized.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第11期1820-1824,共5页
Journal of Tsinghua University(Science and Technology)
基金
国家"九七三"重点基础研究项目(2009CB724304)
清华大学摩擦学国家重点实验室自主研究课题重点项目(SKLT08A06)
