Theoretical Study on Static Performance of Herringbone Grooved Aerodynamics Foil Bearing

In this paper, the mathematical model of herringbone groove aerodynamics foil bearing is established, and the differential form of Reynolds equation is obtained by using finite difference method. The static characteristics of herringbone groove aerodynamics foil bearing such as film thickness and film pressure in bearing clearance are obtained by solving Reynolds equation, and the bearing capacity and friction power consumption are obtained by calculating the film thickness and the distribution of film pressure in bearing clearance. The influence of working state parameters of bearings such as eccentricity, rotational speed and structural parameters of bearing such as groove depth, groove width rate, groove number and helical angle on the bearing capacity and friction power consumption are analyzed. By analyzing the influence of different working and structural parameters on bearing capacity and friction power consumption, the methods of improving bearing capacity and reducing friction power consumption are obtained. The herringbone groove bearings are compared with conventional common foil bearings and rigid surface bearings, and the influence of herringbone grooves on the performance of bearings is obtained by analyzing changes of the bearing capacity and friction power of bearings. The different characteristics of common air foil bearing and herringbone groove air foil bearing are compared and analyzed.