微极性流体润滑剂的螺旋槽径向轴承动力特性

本文采用算子分裂／有限元法解广义雷诺方程，研究微极性流体润滑剂的螺旋槽径向轴承承载力、摩擦阻力特性。油膜空泡采用全润滑区质量守恒的Elrod算法。微极性流体的粘弹特性由耦合数和分子特征长度两个参数决定。计算结果显示：(1)高耦合数的微极性流体螺旋槽径向轴承比一般牛顿流体为润滑剂的轴承具有较高的承载力，摩擦阻力略有增加。(2)在高耦合数条件下，润滑油膜厚度和微极性流体分子特征尺度的比值越小，轴承的承载力和摩擦阻力越大。本文研究表明，选用合理参数的微极性流体为润滑剂，可以提高螺旋槽径向滑动轴承的承载力。

Dynamic performance of herringbone-grooved journal bearing with micropolar fluid

This paper employed operator-splitting/finite element method to resolve the generalized Reynolds equation and study the load capacity, friction resistance of a herringbone-grooved journal bearing with micropolar fluid.Elrod's algorithm of film cavitation is incorporated inReynolds equation to guaranteemass conservation over the lubrication domain. The viscoelastic behavior of micropolar fluid is characterized by two parameters, coupling number and molecular characteristic length. Numerical results indicate that (1) In general, herringbone-grooved journal bearings with micropolar fluid of high coupling numbers have higher load capacity and slightly larger friction resistance than that with Newtonian lubricants. (2) In the cases of high coupling numbers, the load capacity and friction resistance are higher when the ratio of lubrication film thickness to molecular characteristic length is smaller. It is also found that the load capacity of herringbone-grooved journal bearing can be improved by parameter optimizing of micropolar fluid.