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.