||In this study, the numerical method was applied to simulate the thermal effects on the performance of journal bearings. In the adiabatic conditions, no heat was removed through either the journal or bushing, but the thermohydrodynamic conditions considered this heat transfer. Results showed that the temperature of the oil film at the pressure zone for the thermohydrodynamic conditions was higher than that of the adiabatic condition due to the heat conduction from the journal and the bushing to oil film. At the constant eccentricity ratio, the load capacity for the isothermal condition was higher than that of the adiabatic conditions, and the thermohydrodynamic conditions was the lowest due to higher temperature at the pressure zone.|
Under the thermohydrodynamic conditions and the constant rotational speed, with increasing load, the thicknesses of the oil films decreased, so that the temperatures of the journal surface and the bush inner surface increased. This effect became significant at higher rotational speeds. At the constant eccentricity ratio, the greater the radial clearance, the thicker the oil film was, so that the temperature rice was decreased. Considering the deflection of the journal at the adiabatic conditions, results showed that the temperature rise increased at the thinner position of the oil film, and the oil temperature was not uniform along the axial direction of the bearing.