Performance of high-speed hydrodynamic sliding bearings with lubricating oils combining laminar and turbulent flows

摘要

High-speed hydrodynamic sliding bearings use lubricating oil that can have laminar and turbulent flow states, yet turbu-lent states remain relatively unstudied. This study combines theoretical analysis, numerical modeling, and experiments toanalyze lubrication fluids in such bearings. It considers Reynolds equations, energy equations, and temperature-viscosityrelationships under laminar and turbulent flows. The governing equations are solved by the finite difference method.Two-dimensional distributions of Reynolds number, pressure, and temperature in the bearing film, as well as the lubrica-tion characteristics like bearing capacity and frictional force under working conditions, are analyzed. Single and mixedflow states are compared, which demonstrates the coexistence states of laminar and turbulent flows in an oil film underspecific working conditions. Oil film flow distributions differ significantly according to rotational speed and eccentric con-ditions. Flow changes under high eccentricity are complex. The characteristics of oil films in a single flow state deviatesignificantly from those in mixed flow. Changes in flow state and heat should not be ignored during analysis of the lubri-cation performance of high-speed bearings.