Vyšetřování proudění v úzkých mezerách

Abstract

The dissertation thesis is focused on the investigation of the flow in the hydrostatic circular thrust pad bearing with a central circular recess and annular multi-recess hydrostatic thrust bearing. Hydrostatic thrust bearings are characterized by narrow layers of the fluid, which is formed between two sliding surfaces and carry the load. The dissertation thesis deals with the aspects influencing the flow in the hydrostatic thrust bearing, including the physical properties of the fluids and the geometry of the sliding surface. The CFD system ANSYS Fluent, which uses the finite volume method, is used for narrow gap flow research. The dissertation thesis describes the method of creating a mathematical model of hydrostatic thrust bearing. Based on the Navier-Stokes equation the Reynolds equation is derived, which defines the flow between two sliding surfaces. This equation is applied to the hydrostatic circular thrust pad bearing with a central circular recess to obtain relationships for the pressure field, load capacity and volume flow. The results calculated with the defined relationships are compared with those obtained by numerical modelling in the ANSYS Fluent CFD system. For investigation of the flow in the annular multi-recess, hydrostatic thrust bearing the experimental device is designed and constructed. Experiment device of the hydrostatic thrust bearing is designed as a rotary table, which is used for machining systems.