高速水润滑径向滑动轴承的壁面滑移设计

Boundary Slip Design of High Speed Water Lubricated Journal Bearing

为了研究高速水润滑条件下具有不同边界滑移表面的径向滑动轴承的摩擦学特性,运用二元滑移理论建立了相应的数学模型。模型考虑了流体边界的滑移效应,对经典雷诺方程进行了修正,并将流量守恒边界条件应用于空化区。通过仿真对比不同滑移表面对轴承性能的影响,以大承载力和小摩擦阻力为设计目标,对轴承及滑移表面参数进行了优化设计。结果表明:对于偏心率较小、宽度较小和直径较大的轴承,滑移-非滑移间隔表面能显著地提高承载力,降低摩擦阻力和减小空化区面积;当滑移区域与非滑移区域的分界线在普通轴承压力峰值和最小膜厚位置之间时,承载力可达到最大值。

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.