Research on Performances of Deep Hypothermia Hydrogen Gas Foil Bearings

Aiming at the turbulence effect of hydrogen gas foil bearings in practical engineering applications，the static and dynamic performances of the gas foil bearings，lubricated by low-temperature hydrogen，are obtained by coupling the Link-Spring model and Reynolds equation，where the Reynolds equation is modified by the law of the wall，combined with deep hypothermia state of hydrogen gas foil bearings. The static performances of the gas foil bearing lubricated by low-temperature hydrogen and other gas media are compared. The effects of eccentricity，ambient pressure，width-diameter ratio，and nominal clearance on the static and dynamic performances of the gas foil bearing are analyzed. The results showed that the load capacity of gas foil bearing in low-temperature and high-pressure hydrogen conditions is relatively low compared with that of atmospheric air and low-temperature and high-pressure nitrogen lubricating conditions. The load capacity can be intensified by increasing the eccentricity，ambient pressure，width-diameter ratio，the dynamic viscosity coefficients，and reducing the nominal clearance. The direct dynamic stiffness coefficients show an upward trend with the increasing ambient pressure and the decreasing nominal clearance. © 2024 Hunan University. All rights reserved.