基于应力偶流体模型的动载轴承润滑研究

针对实际应用中的润滑油大多为含有高分子添加剂的应力偶流体 ,基于应力偶流体模型对动载轴承的润滑性能进行了数值计算。推导了动载情况下应力偶流体润滑的Reynolds方程 ,利用该模型求解了动载轴承的压力分布 ,比较了牛顿流体和应力偶流体对轴承承载力、轴心轨迹和摩擦系数所产生的不同影响。结果表明 :添加剂的分子链越长 ,应力偶效应越明显 ,并且越有利于提高动载轴承的承载力 ,增大油膜厚度 ,减小摩擦系数

Lubricating performance of dynamically loaded journal bearings based on couple stress fluid model

Most of the lubricants used in practice are couple stress fluids blended with small amounts of high polymer additives. The couple stress model was used to study the lubricating performance for dynamically loaded journal bearings. The modified Reynolds equation of couple stress fluids under dynamic load conditions was derived and then used to calculate the pressure distribution of dynamically loaded journal bearings. The model was also used to analyze the different effects of Newtonian fluids and couple stress fluids on bearing load capacity, journal center orbit and friction coefficient. The results show that longer chain additive molecules increase the effects of the couple stress, the load capacity and the film thickness and reduce the friction coefficient.