Calculation of Six-Lobe and Eight-Lobe Deformable Thrust Sliding Bearings

摘要

The paper deals with the development of a model and the calculation of characteristics of a hydrodynamic thrust sliding bearing which provides the compensation of the axial force in high-speed and low-speed rotors of stationary gas turbine units. In the framework of creating a method for determining the stiffness and damping characteristics of the bearing and calculating the parameters of lubricant flow in the gap, we develop a model of the thrust bearing based on the coupled solution of the problem of the flow of incompressible lubricant between the sliding surfaces and the problem of the deformation of the bearing parts and the shaft under the lubricant pressure. The model makes it possible to find the basic characteristics of the thrust sliding bearing at various relative displacements of the bearing and shaft. The bearing model is verified by comparing our results with the results of calculating lubricant flow in the STAR-CD software package and the results of calculations and experiments reported in the literature. The stiffness and damping characteristics are calculated for two thrust sliding bearings with six and eight lobes, depending on the sliding surfaces closure and variations in the shaft rotation angle with account of the deformation of the sliding surfaces. A significant influence of the shaft rotation angles in the bearing section and the deformations of the sliding surfaces on the integral characteristics of the bearing is demonstrated.