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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。
Based on the Reynolds equation and the N-S equation, the numerical simulation of the gap flow field in a spiral groove dry gas seal was carried out. Under the condition of changing speed, outlet back pressure, inlet pressure and seal clearance, the results of leakage rate and opening force obtained by the two methods are compared. The results show that the results obtained by the Reynolds equation deviate more and more from the results obtained by the N-S equation as the rotational speed, pressure differential and seal clearance increase. The N-S equation correctly describes the plug-flow phenomenon, but the Reynolds equation does not. However, on the whole, the results of the sealing performance obtained by the Reynolds equation are close to the results obtained by the N-S equation within the parameters of the working condition selected in this paper. Based on the mathematical and physical differences between the two equations, these results are explained and analyzed. The advantages, disadvantages and applicability of the two methods in dry gas seal performance analysis are summarized.