Abstract:The multiphase flow model of CFD simulation software was applied to study the oil film characteristics of elliptical bearing.The SST turbulence model and Mixture two phase flow model of elliptical bearing were built,and the oil film characteristics and cavitation distribution characteristics of the bearing were analyzed.The oil film characteristics considering two phase flow and without considering it were compared,and the validity of the new calculation model was proved.The various influence factors on the lubricating oil gasification were studied.The results show that two phase flow model can even better reflect the actual oil film characteristics of elliptical bearing than single phase flow model.Along with increasing of the eccentricity and rotational speed,gasification phenomenon is more obviously,and high viscosity lubricating oil is more prone to gasification phenomenon.The lubrication oil in the second oil wedge of elliptical bearing is more easy appeared gasification than that of in the first.