Maximum oil film temperature of 8-lobe journal bearings

Multilobe journal bearings of steam turbines have well-known thermal problems. The paper presents the results of the calculations of maximum oil film temperature of 8-lobe journal bearings. Generally, there is small effect of the bearing relative clear-ance and lobe relative clearance on the displacement of journal and static equilibrium position angles. The orientation of load with regard to the bottom lobe (lobes) of multilobe bear-ings affects the maximum oil film temperatures of oil film. Also, the bearing geometry parameters such as the bearing relative clearance, lobe relative clearance cause the variation in the maximum oil film temperature. It was stated in this investigation that an increase in the lobe relative clearance and journal rotational speed causes the decrease in the maximum oil film temperature.