端柱面组合气膜密封系统稳态特性数值模拟与分析

针对端柱面组合气膜密封系统建立稳态特性的分析模型,给出基于有限元数值方法求解气膜压力分布的数值模拟方法和流程,实现端面、柱面区域的耦合求解,进而给出了端柱面组合气膜密封系统稳态特性数值模拟计算的方法.通过与Fluent软件仿真结果的比较验证数值模拟方法的正确性.重点研究膜厚与旋转轴转速对端柱面组合气膜密封系统稳态特性(端面气膜反力、柱面气膜反力、泄漏量、摩擦转矩)的影响,计算分析表明:随着膜厚的增加,泄漏量增加、摩擦转矩减小;随着端面膜厚的增加,端面气膜反力缓慢减小、柱面气膜反力出现极值;随着柱面膜厚的增加,端面气膜反力和柱面气膜反力都在减小;柱面膜厚对稳态特性的影响大于端面膜厚.端柱面结构中密封气膜压力的耦合对密封特性影响显著,稳态特性数值模拟方法的实现为动态特性分析提供了基础. 

Numerical simulation and analysis of steady-state performances for face and cylinder gas film seal system

The steady-state performances analysis model of face and cylinder gas film seal system was established; the solving method and process based on the finite element numerical method for the pressure distribution of gas film were given; the face area was solved coupling with the cylinder area, and the method of numerical simulation calculation for the steady-state performances of face and cylinder gas film seal system was presented. The numerical simulation method was verified by comparing with the Fluent software results. The influence of film thickness and rotating speed of axle on the steady-state performances of the gas film seal system, such as face opening force, cylinder opening force, leakage, friction torque, was studied. Calculation and analysis show that with the increase of film thickness, the leakage increases and friction torque decreases; with the increase of face film thickness, the face opening force decreases slowly, and extreme value of cylinder opening force appears; with the increase of cylinder film thickness, both face opening force and cylinder opening force decrease; the influence of cylinder film thickness on the steady-state performances is more obvious than that of face film thickness. The coupling of seal pressure of gas film in the face and cylinder structure has a distinct effect on seal performance, and the steady-state performances numerical calculation method provides the foundation for the dynamic characteristics analysis.