Investigation of the dynamic characteristics of turbine impeller disc of gas turbine engine using ansys software

Abstract

During the operation of a gas turbine engine, the rotors including the impellers and the impeller discs of the turbine part are susceptible to damage because of its oscillation. This requires that reducing of oscillation and the impact of the oscillation on the impeller disc should be paid attention specifically in the design and manufacturing process of the turbine impeller disc. Currently, there are a lot of studies assessing the effects of oscillation on turbine disc as well as introducing modern technological innovations to improve durability, working life and manufacture cost of turbine disc part. In this paper, the authors present the research of factors affecting the impeller disc oscillation through the study of the dynamics of its constituent components ... Furthermore, this paper also presents a theoretical analysis of the formation of oscillation in the impeller disc. On the basic, a mathematical model of disc oscillation is set up to give the free oscillation equations, the equation for calculating the oscillation frequency and spectral characteristics of the individual oscillation. The authors set up an experiment model and carried out the test in order to obtain the characteristics of oscillation patterns and specific frequencies of the disc. The specific oscillation of the impeller disc, its individual oscillation, as well as the impact of the factors occurring in the operating of the disc was calculated by using ANSYS simulation software. By creating a three – dimensional model of the turbine disc of gas turbine engine ДP76, the individual oscillation values in a variety of engine operation modes were calculated to compare with the actual value while the engine is operating. The results have a good agreement with the measured values. This affirms the advantages and prospects in applying ANSYS software to the design and manufacture of the turbine impeller disc.