To investigate the influences of pressure and temperature distribution of gas film on the performance of foil bearings applied to turbomachineries at high temperature and speed

the Reynolds equation and the energy equation are established for a hydrodynamic foil bearing with constant stiffness of structural support

and gas velocity in the bearing is analyzed. Coupling the fields of temperature

pressure and deformation of top foil

finite difference method(FDM)is adopted to solve the equations

and pressure and temperature distribution of gas film are obtained. In the analysis

the variation tendency of pressure and temperature of gas is obtained with the changed dimensionless stiffness of support structure and bearing number. It is found that when the dimensionless stiffness of the support structure increases

the gas pressure decreases

however

the gas temperature behaves oppositely

and when the bearing number increases

the pressure and temperature of gas increase

thus the dimensionless stiffness of support structure and bearing number ought to be taken into account in gas foil bearing designing.