Analysis Of Static Strength And Fatigue Reliability Of High-Pressure Turbine Rotor System

The end journal and turbine disc which are the key components of high-pressure turbine rotor system work under the abominable conditions of high cyclic temperature and mechanical loads.In order to ensure the stability and reliability of the end journal and turbine disc when they are in service,an accurate analysis of the static strength and fatigue reliability is needed in design.This thesis studies the reliability of the static and fatigue strengths of the end journal and turbine disc of a high-pressure turbine rotor system and obtains a satisfying result of the static strength and fatigue reliability.Firstly,we set up the solid model of the high-pressure turbine rotor system by PRO-E software,including the high-pressure turbine blades,the turbine disc,the end journal and the connectors.As a result of the irregular shape of the turbine rotor system,the elements containing the singular angle unit are generated easily when doing finite elements mesh.This will lead to the singular stiffness matrix in the process of calculation.In this paper,the model has been adjusted appropriately in order to make sure that the finite elements analysis is going well.Secondly,MARC software is employed to do finite element calculation on the end journal and turbine disc of high-pressure turbine rotor system.Based on the thermal elastic-plastic finite dement theory and non-linear contact finite dement analysis theory,the mechanical analysis is carried out for the end journal and turbine disc in all working states and the dangerous fatigue rupture points are found.In addition,the states of stress,strain and temperature of the dangerous points are recorded and prepared for the reliability analysis.Finally,depending on the stress-strain analysis results and the material's fatigue characteristics,we select S-N curve method for the calculation of the static strength and fatigue reliability of high-pressure turbine rotor system.Through the analysis of the static strength and fatigue reliability of high-pressure turbine rotor system,this thesis provides a reference to improving the reliability and prolonging the fatigue life of the end journal and turbine disc.