Thermal Elastohydrodynamic Lubrication Characteristics of Plain Journal Bearings Under High Reynolds Numbers
Under the condition of high speed,heavy load or large radial clearance,the plain journal bearings are often accompanied by change of lubricating oil flow state,rise in oil temperature and elastic deformation of half-bearings,which have great influence on operating stability of the bearings.A lubrication simulation model coupling multiple factors such as turbulence,thermal effect and elastic deformation is established by combining finite difference method and finite element method.The distribution of oil film pressure and oil film thickness of the bearings is analyzed under turbulent state,and the variations of load capacity and maximum oil film pressure of the bearings with eccentricity,rotational speed and clearance ratio are discussed.The results show that under high Reynolds numbers,the turbulent effect affects the distribution of oil film pressure and oil film thickness,decreasing the maximum oil film pressure and eccentricity,and increasing the minimum oil film thickness and deflection angle;with the increase of rotational speed and eccentricity,the load capacity of oil film and maximum oil film pressure increase;with the increase of clearance ratio,the load capacity of oil film decreases nonlinearly,and the maximum oil film pressure increases approximately linearly.
plain bearingReynolds numberturbulenceminimum oil film thicknessload capacitysimulation model
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