Abstract:The 27 models of straight oblique labyrinth seals were set up by changing the geometry parameters of straight-through oblique labyrinth seals,including the seal clearance,fin height,fin pitch,fin tip thickness,fin number,fin front inclined angle and rear inclined angle .The influences of the drop pressure ratio of import and export and the geometry parameters of straight-through oblique labyrinth seals on sealing characteristics were numerical investigations.The results show that the discharge coefficient of oblique labyrinth seals is increased along with the increasing of the drop pressure ratio,the seal clearance,fin height and fin tip thickness,and it is decreased along with the increasing of fin pitch and fin number.The discharge coefficient is greatly influenced by fin front inclined angle and rear inclined angle,which is firstly decreased and then increased along with the increasing of the fin front inclined angle,and decreased along with the increasing of the rear inclined angle.This is because there is a small swirl in the cavity,which is strengthened with the increasing of the rear inclined angle,so the dissipation of energy is increased and the discharge coefficient is decreased