Flow field in clearance of dynamic pressure gas foil bearing with partical slip
In order to reveal the effects of the slip state on the flow field evolution under different working conditions of the dynamic pressure gas foil bearing,taking the dynamic pressure gas foil bearing as the research object,the modified Reynolds equation for circumferential partial slip was established and solved by the over-relaxation iteration method.The influence of slip on the flow field in the bearing clearance was analyzed under the change of rotating speed,eccentricity,clearance height and foil deformation.The results showed that with the increase of rotating speed or the decrease of clearance height,the fluid-solid interface changed from no slip state to the stator side slip state,and finally reached the slip state at both sides.The area and velocity of the slip region on the rotor side from the pressure rise region and the stator side from the pressure drop region to both sides gradually increased.However,as the eccentricity increased,the slip velocity on both sides increased gradually,and the slip area was almost unchanged.The deformation of the foil caused the slip velocity field to exhibit a stepped distribution.Partial slip had a maximum effect of 17％on the highest film pressure.The reason for the above law is that the changes of velocity gradient and pressure field make the interface shear stress and ultimate shear stress change complexly.
dynamic pressure gas bearingmicroscalefoilinterface slipflow field
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NSTL
万方数据
