Investigation of Radial Gas Bearings with Longitudinal Micro-Grooves of Various Transverse Profiles

摘要

For a radial gas bearing with two lines of compressed gas supply into the working gap with blind micro-grooves of a constant and variable depth of the following profiles: triangular or stepped, with the increasing or decreasing depth of the micro-groove in the direction of movement of the compressed gas - radial lifting force, gas consumption and performance ranges were founded. In the study of the effect of blind micro-grooves of different transverse profiles (seven options) on the characteristics of radial bearings the, authors used the methods of cyclic sweep (grooves of a triangular transverse profile) and the method of splines (stepped grooves). The calculations with optimal design parameters (maximum ratio of the radial lifting force to the gas flow rates) showed that the radial bearing with longitudinal micro-grooves of various transverse profiles, the depth of which decreases in the direction of gas flow, has a significantly greater radial lifting force (by 54% at P_H = 5; λ = 2; ae = 0.25; a = 0.676) compared with a suspension with the grooves of a constant depth and efficient in the range of practical use of supports, unlike the suspensions with micro-grooves with a minimum depth in the area of compressed gas supply.