Boundary slip design of high speed water lubricated journal bearing

To investigate the tribology performance of journal bearings with different boundary slip regions under high-speed water lubrication, the two-component slip theory is employed to establish corresponding numerical model. In this model, the extended Reynolds equation is obtained by taking the fluid boundary slip effect into consideration. And the flow conservation boundary condition is applied in cavitation region. Setting high load bearing capacity and low friction drag as the optimal goals, the influence of different slip regions on tribology characteristics is studied to get optimal parameters of the bearing and the slip region. The results show that for bearings with small eccentricity ratio, small width and large diameter, the slip/no-slip interval surface on sleeve enables to shorten the cavitation region, enhance the load carrying capacity and reduce the friction drag dramatically. When the border line of the slip/no-slip regions gets close to the location between the pressure peak and the minimum film thickness of normal bearing, load carrying capacity reaches the maximum value.