Effect and sensitivity analysis of the rotational speed on the fluid-induced force characteristics of the straight-through labyrinth gas seal

摘要

The effects of the rotational speed on the fluid-induced force characteristics of a straight-through labyrinth gas seal(STLGS)are numerically investigated using the steady computational fluid dynam-ics(CFD)method based on a three-dimensional model of the STLGS.The fluid-induced force char-acteristics of the STLGS for five rotational speeds at a pressure drop of △P =5000 Pa with and without eccentricity are computed.The grid density analysis ensures the accuracy of the present steady-CFD method.The effect and sensitivity analysis show that the changes in rotational speed af-fect the pressure forces,viscous forces and total pressure distributions on the rotor surface,velocity streamlines,leakage flow rates,and maximum flow velocities.The results indicate that the rotational speed inhibits the pressure forces,leakage flow rates and maximum flow velocities and promotes the viscous forces and total pressure on the rotor surface.