关键词: 滑靴副, 磨损, 流固热耦合, 动压效应

Abstract: To investigate the factors restricting the high-speed applications of single sealing land slippers, a flow-solid-thermal coupling dynamic model was established, considering the sealing land wear profile. The effects of rotational speed and seal width on oil film thickness, operational posture, bearing stiffness and leakage were analyzed. Results show that at high speed, the increases of centrifugal moment of the slipper lead to a larger tilt angle and a reduced minimum bottom clearances. Simultaneously, the enhanced dynamic pressure effect increases the suction-side clearances, reduces oil film stiffness, and elevates the risk of partial wear. Increasing the width of the sealing lands may improve the supporting stiffness of the slipper, but the outer-to-inner diameter ratio exceeding 1.6 will result in thicker oil films and increased leakage. It is concluded that leakage and partial wear are the main factors restricting the high-speed applications of single sealing land slippers. Introducing microstructures on wide sealing lands to limit wedge-shaped dynamic pressure effects may effectively expand the allowable speed ranges of slippers.

Key words: slipper pair, wear, flow-solid-thermal coupling, dynamic pressure effect