轴间气膜密封周向相对滑动判定方法

为预判端面轴间气膜密封中密封环与外层转子之间是否产生周向相对滑动，提出了一种考虑离心膨胀效应的轴间气膜密封周向相对滑动判定方法。分析了密封环与外层转子之间产生周向相对滑动的力学机制，将密封环和外层转子离心膨胀简化为轴对称平面应力问题和轴对称平面应变问题。计算了密封环和外层转子的弹性变形刚度差异对膨胀变形及连接关系的影响，得到了密封环与外层转子产生临界滑动的工况区域。所提判定方法对工程中密封环的周向滑动问题提供了预测及指导。 

Judgment method of circumferential relative sliding of air film seal between shafts

In order to predict whether there is relative sliding in the circumferential direction between the seal ring and the outer rotor in air film seal between shafts, a method for determining the circumferential sliding of air film seal between shafts considering centrifugal expansion effect is proposed. The mechanical mechanism of the circumferential sliding between seal ring and outer rotor is analyzed. The centrifugal expansion of seal ring and outer rotor is simplified into axisymmetric plane stress and axisymmetric plane strain. The influence of the difference of elastic deformation stiffness between seal ring and outer rotor on the expansion deformation and the connection relationship is calculated, and the critical sliding operating area between seal ring and rotor is obtained. The research method provides a prediction and guidance method for circumferential sliding of seal ring in engineering.