Numerical Study Of Static Characteristics Of The Foil Hydrodynamic Thrust Gas Bearing With Hemispherical Convex Dots In Turboexpander

With the increasing demands of indoor living environment, the increasing demands of refrigerated and frozen in daily life and the continuous strengthening of the awareness of environmental protection and green technology, the requirement of energy saving and high efficiency in the field of refrigeration and air conditioning is becoming more and more urgent. Air refrigeration cycle, as a kind of technical method in the field of refrigeration, has returned to the people’s vision in the last ten years due to its environmental protection characteristics. In order to improve the refrigerating efficiency of the cycle, the improvement of the performance of the turbine expander becomes the key to study. Bearing components that are related to the overall performance of the turbine expander become the core content of the study. Traditional rolling bearings have been unable to meet the requirements of high speed. Researchers have pinned their hopes on the gas bearing. Besides used in turbine expander, foil hydrodynamic thrust gas bearing also has a great application prospect in other high-speed rotating machinery. For expanding the application of foil hydrodynamic thrust gas bearing, we must reveal its operation mechanism through theoretical research firstly.For the numerical analysis of foil hydrodynamic thrust gas bearing with hemispherical convex dots, the paper established a static model of this bearing by ANSYS software and solved its structural deformation under film pressure by finite element method(FEM), and analyzed the influence factors for its deformation. The paper also obtained the gas film pressure distribution and gap size by finite difference method(FDM) using MATLAB analysis software, and analyzed the influence of different structural parameters on the pressure distribution and carrying capacity by control variable method.By adjusting the parameters of hemispherical convex dots which affect the structural deformation of foil bearing, or by improving the bearing size parameters which affect the film pressure distribution and carrying capacity, we can design an optimal foil hydrodynamic thrust gas bearing with hemispherical convex dots to meet certain rotor size and speed requirements. Through the analysis of this paper, we hope to contribute to the improvement of the efficiency of air refrigeration cycle.