Thermomechanical Analysis of the Turbo-Compressor Sliding Bearing Mount Units

On SKIF k-1000 supercomputer the temperature fields in turbo-compressor sliding bearings were defined. Dynamic temperature loads were estimated by calculating of heat conduction in the rotor shaft from 600 C heated turbine to the compressor wheel. Conduction and radiation losses were taken into account. The role of friction in heating the contacting parts of the bearing mount assembly was estimated. The calculation of heat conduction through the rotor shaft were made for different exploitation regimes namely for the starting and working regimes and for the lubrication absence conditions. Different constructive shaft variations were used that made it possible to smooth the temperature peaks in thickening ring of the shaft. The temperature fields in bearing mount assembly details were calculated and the thermal stresses were estimated. The role of lubrication was estimated in two ways. In preliminary calculations its influence was estimated by taken into account only its convection and radiation properties as the properties of the environment in the bearing unit. Then the whole process of the oil- bearing unit parts interaction was modeled. The problem was solved in ALE formulation. The gap between rotor shaft and sliding bearing was filled with lubrication. The areas of the ALE- mesh that corresponded to the inflow of the oil was prescribed its initial cool temperature. Then the incoming oil was taken with rotating rotor shaft, the later conducting the heat from the turbine wheel.