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Tilting-pad gas journal bearing are widely used in the field of high-speed turbine machinery, especially in the special environment of low temperature. However, the performance is limited by structure, so a clear understanding of the field is particularly important. In this paper, finite volume method is used to simulate the three-dimensional flow field of high-speed tilting-pad gas bearing, then the effects of shaft speed, eccentricity and gas film thickness on the bearing capacity are studied. The simulation results show that the two factors of shaft speed and gas film clearance play a decisive role in producing sufficient bearing capacity of tilting tile radial gas bearings compared with other factors.

The gas film between the thrust disc of rotor and the thrust gas bearing in the axial direction is only tens of microns in the high-speed cryogenic turbo expander. The bearing loading capacity is one of the static characteristics, and the experimental research in the study of static characteristics is the same important as numerical simulation, a new and accurate type of test system for dynamic measurement of axial thrust bearing loading capacity of the high-speed cryogenic turbo expander is presented in this paper. The system can accurately measure the gas film force between the thrust disc and the hydrostatic or dynamic thrust gas bearing, study the influence of different structural parameters on the bearing loading capacity, and simultaneously monitor the dynamic relationship between the gas film force and the value of film gap.