Influence of Surface Waviness on Upstream Pumping Characteristics of Liquid Ellipse-Dimples Face Seal
The coupling effect of surface waviness and geometric groove of seal face makes the variation of sealing per-formance more complicated.Based on the assumptions of rough and wavy surface and considering the cavitation effect,a theoretical model of upstream pumping liquid seal with inclined-ellipse-dimples was established,and the pressure distri-bution and leakage rate of upstream pumping face seal were numerically calculated.The influences of geometrical parame-ters such as waviness amplitude and waviness number and operating parameters such as rotational speed and sealing pres-sure on opening force and leakage rate were analyzed.The results show that considering the surface waviness,the seal face exhibits a higher hydrodynamic effect,but the surface waviness easily leads to the leakage of the sealing medium and weak-ens the upstream pumping effect.With the increase of wave amplitude and waviness number,the opening force slightly in-creases.The leakage rate is positively enhanced with the increase of wave amplitude,but the waviness number has no obvi-ous effect on the leakage rate.Under the influence of cavitation effect and surface waviness,the opening force of seal face generated by velocity shear can be increased by more than 50％,and complete upstream pumping of fluid is formed.The in-crease of seal pressure and film thickness reduces the upstream pumping performance and sealing performance of the fluid.
surface wavinesscavitation effectupstream pumpingelliptical dimplesliquid face seal
NETL
NSTL
万方数据
维普
