Numerical Analyses of a Spiral Groove Dry Gas Seal Under Slip Flow Conditions

摘要

A finite element program for the spiral dry gas seal under slip flow conditions is designed based on the modified Reynolds Equation. Making u se of a rule of getting larger film stiffness while maintaining lower lea-kage rate, the effects of the face geometric parameters on the static beh-avior of the S-DGS are analyzed under slip flow conditions. Compared with the computed result without considering slip flow, it shows that t-he groove length ratio, groove depth and helical angle have large influ-ence on the seal performance, but the number of spiral grooves and gro-ove width ratio have little influence on that under slip flow conditions.