Abstract

Modern steam turbines for electric power utilities have reached the output of 1000 MW per unit. It causes the need for an increase in shaft diameters and application of special tilting-pad journal bearings.  The titling-pad journal bearing are one of the options as they have very good hydrodynamic stability at high speed and are less sensitive to load direction and shaft misalignment. They allow for minimizing the oil flow too. In case of large output turbines, large diameters of heavy rotors the number of of pads is restricted to three. The reliable design of journal bearings for responsible turbines is assured by calculation and analysis of static and dynamic characteristics of bearing. These characteristics can be determined from the oil film pressure and temperature distributions. The paper describes  the possibilities of the application in large outputturbines of titling-pad bearings. Static characteristics of these bearings can be obtained from the solution of Reynolds, energy, geometry and voscosity equations. Numerical method, assumptions of imcompressible lubricant, the laminar and adabatic flow of oil in the bearing pad of finite length and static equilibrium position of journal have been assumed