| A double symmetric contraction section to guide air flow is designed for a high-pressure disc gas bearing with a double symmetric contraction section.Which keeps the air flow at the entrance of the gap quite stable,so it can theoretically overcome the disadvantages of low supply pressure and low bearing capacity of the static pressure bearing with compensations.By analyzing the development law of the bearing boundary layer which is analogous to the development law of the boundary layer of parallel disc radial flow,the main structural parameters of the bearing are preliminarily determined and the static characteristics of the bearing are studied.The main contents of this paper are as follows:1.Under incompressible condition,the development of boundary layer thickness in bearing clearance is obtained by considering the boundary layer momentum integration formula in cylindrical coordinates and the inlet section effect of bearing.The numerical simulation results verify the feasibility of the method,and the velocity distribution law suitable for high pressure disc gas bearing is determined.2.CFD flow field analysis software is used to simulate the internal flow field of the high-pressure disc gas bearing,and the main structural parameters of the bearing are preliminarily determined through the analysis of the internal flow field.3.The internal flow of the bearing is analyzed by the CFD flow field analysis software for the high pressure disc gas bearing,and the pressure distribution,bearing capacity and mass flow characteristics of high pressure disc gas bearing are analyzed.The results show that,the influence of the boundary layer on the air flow in the gap is obvious,and the main parameters of the bearing can be determined by the method in this paper.When compared with the gas bearing with compensations,the bearing overcomes shortcoming of the limit of gas supply pressure,and the bearing capacity is obviously improved. |
