Abstract
The present paper describes the experimental test rig and the procedure for experimental studies of radial hydrostatic force components in a relatively long cylindrical annular seal for the hydraulic system of a centrifugal pump. The obtained rotor loading characteristics showed a linear dependence between the applied force and the resultant displacement over a wide range of the shaft eccentricity. With the theoretical ratio of coefficients for radial and angular stiffness, there have been obtained experimental dependences of these coefficients from the pressure differential across the gap. The effects of the circumferential backflows of the handled medium due to the pressure distribution on the magnitude of these coefficients have been evaluated. The phenomenon of self-excitation has been obtained for the non-rotating shaft in a relatively long annular seal of a cylindrical shape at a relatively large eccentricity of the shaft.
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