浮环轴承内油膜变偏心率与恒偏心率润滑特性对比分析*

目前对浮环轴承油膜特性的研究，主要基于偏心率对油膜压力及最小油膜厚度的影响，未能反映真实的油膜边界运动。利用计算流体力学的方法，实现浮环与轴颈之间的内油膜边界运动；建立轴颈-浮环之间内油膜润滑部位的流体域模型，研究多相流变偏心率下浮环轴承的油膜特性。结果表明：考虑变偏心率下的仿真计算结果更能反映真实的油膜润滑特性；最大油膜压力在恒定偏心率与变偏心率下均随着转速的升高而增大，最小油膜厚度在恒定偏心率下随着转速的增加保持不变，在变偏心率下随着转速的增加而减小；最大油膜压力与最小油膜厚度在变偏心率影响下变化更明显，为浮环轴承的优化设计提供了理论依据。

Comparative Analysis of Lubrication Characteristics Between Variable Eccentricity and Constant Eccentricity of Oil Film in a Floating Ring Bearing

At present,the research on oil film characteristics of floating ring bearings is mainly based on the influence of eccentricity on oil film pressure and minimum oil film thickness,which fails to reflect the real oil film boundary movement.The motion of inner oil film boundary between floating ring and journal was realized by computational fluid dynamics.The fluid domain model of the inner oil film lubrication part between journal and floating ring was established to study the oil film characteristics of floating ring bearings with multi-phase rheological eccentricity.The results show that the simulation results considering variable eccentricity can better reflect the real lubrication characteristics of oil film.The maximum oil film pressure increases with the increase of rotational speed under constant eccentricity and variable eccentricity,while the minimum oil film thickness remains unchanged with the increase of rotational speed under constant eccentricity and decreases with the increase of rotational speed under variable eccentricity.The maximum oil film pressure and minimum oil film thickness change more obviously under the influence of variable eccentricity,which provides a favorable theoretical basis for the design of floating ring bearings.