干气密封的稳态特性是密封设计中的重要依据和指标。干气密封稳态特性可通过基于轴向力平衡的静态模型和轴向-角向耦合的动态模型两种途径获得。基于上述两种模型间存在的差异点，就动环偏摆角、静环静态偏摆角和副密封阻尼展开参数研究，讨论两种模型计算所得的稳态特性（膜厚与泄漏率）之间存在的差异，进而给出它们在干气密封稳态特性研究中的适用性分析。计算中，动力学方程和流场方程分别采用有限差分法和有限元法进行离散求解，以膜厚与泄漏量为稳态特性的主要指标。结果表明，当副密封阻尼较小时，角向偏摆角对于静环稳态特性的影响极小，可用静态模型来近似动态模型，以简化计算过程和缩短计算时间。而当副密封阻尼较大时，密封动静环的角向相位差较大，显著地影响密封静环的稳态特性，使用静态模型获得的结果与动态模型的结果差别较大，而且此时前者无法反映由于静环角向追随性较差引起两环端面易发生接触的问题，因此大阻尼情况下宜采用动态模型。
The models of gas face seals for stead-state response analyses could be categorized into two basic models:equilibrium of axial forces static model (EAFSM), and axial-angular dynamic model (AADM). A parameter investigation including angular element and damping of secondary seals is carried out to gauge the difference between computing results of aforementioned models and to give themselves respective scope of application. The study shows that damping of secondary seals has much more remarkable influence on steady-state performance of face seals than angular tilt angles for its enormous effect on phase difference in angular modes. Even though the influence of rotor tilt angle and static stator tilt angle is feeble compared with damping, it cannot be ignored for the existence of damping. Therefore, when damping of secondary seals is enough small to neglect its effect on phase difference, EAFSM could be adopted to take place of AADM for time saving in practical project.
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