Characteristics of a hybrid journal bearing with one recess: Part 2: Thermal analysis

Abstract

A thermal analysis is made of a fluid-film hybrid journal bearing with one recess under steady-state and adiabatic conditions. The coupled Reynolds equation and energy equation are solved simultaneously by a finite difference method with a successive under-relaxation method. The results for isothermal conditions with effective temperature and feed oil temperature are also obtained for comparison. The load capacity for the adiabatic condition is lower than that for the isothermal condition due to temperature gradients as well as the higher temperature distribution in the high pressure zone. Moreover, the high pressure recess works as a cooling source, so that the maximum temperature occurs at the edges of the bearing and near the position of minimum film thickness. The side flow decreases as the eccentricity increases in the adiabatic condition. This is caused by the rapid decrease in film thickness when eccentricity increases, which dominates the effect of pressure-induced flow.