The Modern Single Shaft Gas Turbine Rotor Stress-Strain State Determination Taking into Account the Contact Thermoelasticity Problem

Abstract

The paper outlines a finite elements refined mathematical model of the stress-strain state of single shaft gas turbine engine that can be used in ground or floating power plants. The mathematical model, built on the basis of special contact finite elements takes into consideration the contact thermoelasticity problem in the joint area of disk and blades. On the basis of the developed mathematical model the fields of turbine rotor dynamic stresses and displacement have been found too. To make the clear decision about the developed mathematical model adequacy mostly loaded impeller dynamic stresses field has been found and verified by comparison with the calculated results without contact and experimental data. The divergence between the calculated data and experimental results is less than 8%. The turbine rotor displacements and dynamic stresses have been found for different forced vibration modes for the wide range of harmonic indexes changing from 0 to 4. The obtained results along with the previous studies of this rotor fluid flow and thermal state could be used in further studies of the turbine rotor creep and fatigue strength and blades crack researches.