Speaker
Description
Gas bearings are an appealing technology which is widely used in turbo-machine in large cryogenic systems due to its inherent characteristic of oil-free and high-speed capability. The hydrodynamic gas bearings are more effective to cryogenic system but less load capacity and dynamic stability by compared with externally pressurized gas bearings. Etching some grooves on shaft or bearing is proved to be effective by experiments to improve its static and dynamic performance. Due to the hydrodynamic gas bearing performance parameters, such as load capacity and stiffness, are dominated by styles and geometric parameters of groove. In this paper ，the effect of groove styles and geometric parameters to the performance parameters of hydrodynamic gas bearings was presented. And a new style of groove was designed which can effectively improve the static and dynamic performance. we conclude that based on calculation of CFD: geometric parameters of groove do have some influence on static and dynamic of hydrodynamic gas bearings, for each parameter of groove there is a best optimal objective value which makes load capacity and stiffness maximum; The new style of groove presented in this paper has better static performance than spiral style and π-style groove.