Abstract:By taking the noncontacting mechanical seal as the prototype,a test rig was established for the magnetic fluid hydrodynamical end face lubrication,and the influences of the rotational speed,the pressure of the sealed medium and the magnetic field intensity on the liquid film lubrication characteristics were investigated.The analytical calculation method of magnetic fluid hydrodynamic lubrication characteristics was established based on the theory of Muijderman narrow groove,and the analytical analysis results were compared with the experimental results.The results show that,with the increase of the rotational speed and the pressure of the sealed medium,the friction torque and the pumping capacity are increased,while the film thickness is decreased.With the increase of magnetic field intensity,the friction torque is increased while the pumping quantity and film thickness are decreased.Compared with rotational speed and sealing medium pressure,the influence of magnetic field intensity on the hydrodynamic lubrication performance of magnetic fluid is particularly significant.Therefore,when the working condition changes,the sealing performance can always be kept in the best working range by adjusting the magnetic field intensity.The results obtained by the analytical calculation method are consistent with the experimental results,which verifies the reliability of the experimental method,and also shows that the presented analytical calculation method can be used to predict the hydrodynamic lubrication performance.