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access icon openaccess Research on flow characteristics of aerostatic circular thrust bearing

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 28/09/2018, Accepted 12/10/2018, Published 19/10/2018

In order to improve the pressure distribution, the aerostatic circular thrust bearing with single supply hole was studied. In the computational fluid dynamics (CFD) simulation, the laminar model, the turbulent model, the mixture model of laminar and turbulent were used simultaneously. The micro-characteristics of the gas flows were analysed based on the simulation results. One test rig was built for measuring the pressure distribution with the single test hole, and the calculated and experimental results were compared. The results showed that when the gas film clearance is small and the gas flow is subsonic completely, the whole gas flow is laminar flow, which should be calculated based on the laminar model and when the gas film thickness is large and there is supersonic flow in some region, which should be calculated according to the mixture model; at the same time, there is no surface of discontinuity for Mach number and pressure distribution, and no shock, and the pressure is recovered due to the boundary layer separation, the change of the flow state and the change of viscosity. The method for testing the pressure distributions with a single test hole is effective.

Inspec keywords: machine bearings; Mach number; supersonic flow; viscosity; flow separation; boundary layer turbulence; subsonic flow; flow simulation; laminar flow; computational fluid dynamics

Other keywords: gas film clearance; supersonic flow; single test hole; gas film thickness; boundary layer separation; microcharacteristics; flow state; mixture model; pressure distribution; aerostatic circular thrust bearing; subsonic gas flow; viscosity; single supply hole; laminar model; flow characteristics; laminar flow; Mach number; CFD simulation; turbulent model

Subjects: Supersonic and hypersonic flows; Mechanical components; Laminar flows; Applied fluid mechanics; Boundary layer and shear turbulence; General subsonic flows; General fluid dynamics theory, simulation and other computational methods; Fluid mechanics and aerodynamics (mechanical engineering)

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