剪切稀化对径向滑动轴承润滑特性的影响

The purpose of this paper is to study the lubricant shear-thinning effects on the film bearing performance. A thermal-hydrodynamic lubrication analysis model is presented, considering the shear-thinning effect, turbulent effect, and mass conserving cavitation boundary conditions. Then, the bearing performance is solved by finite element method. The correctness of the analytical model is verified by the comparison between the theoretical and existing experimental data. Under wide operating conditions, such as speeds, loads and oil supply temperatures, the effects of shear thinning on the lubrication performance, such as film thickness, film pressure, temperature rise, power consumption, flow rate, is systematically investigated. The applicability of the thermal model is discussed. It is showed that the shear thinning effect has important influence on the film bearing performance. The significance of the shear thinning effect is depending on the load and speed conditions. Shear thinning effects are improved the bearing performance in light load condition and deteriorate in heavy load condition. The thermal model is critical to correctly evaluate of shear thinning effects on the bearing performance, which is the reason that large deviation between theory and experiment was observed. Finally, the preferred working conditions for the lubricant with shear thinning effect is suggested.