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.