The liquid film phase change phenomenon not only changes the lubrication state of the end face

but also has a significant influence on the sealing performance and stability. The governing equations are discretized using the finite volume method. The influence of the structure parameters of spiral groove and the sealing condition on the sealing performance and phase change rate were studied. Results show that the opening force and leakage rate increase with the increase of the spiral angle

the number of grooves

groove depth

the pressure difference and the rotation speed; increase first and then decreases with the increase of the ratio of groove width in radial direction to surface width and the ratio of groove width to dam width

and take the maximum value when the ratio of groove width in radial direction to surface width ζ=0.5 and the ratio of groove width to dam width φ=0.7. The phase change rate increases with the increase of spiral angle and rotating speed

decreases with the increase of the number of grooves

groove depth

the pressure difference and the ratio of groove width to dam width

decreases first and then increases with the increase of the ratio of groove width in radial direction to surface width

and take the minimum value when the ratio of groove width in radial direction to surface width ζ=0.8. The phase transition process can be effectively inhibited by reasonable selection and combination of the parameters. The sealing performance can be improved by using the phase change phenomenon while ensuring the stability of the sealing operation.