Numerical analysis of the vibrational state of the rotor blade for last stage of the energy gas turbine under action of unsteady gas flow

А.I. Borovkov,V.S. Modestov, I.B. Voinov, M.S. Gritskevich, N.O. Simin, V.V. Krivonosova, V.V. Zavgorodniy

At this paper the numerical simulation and investigation of rotor blades aeroelastic vibrations for the fourth stage of gas turbine  in order to identify the possibility of fluid-induced vibrations and flutter were considered. The results of simulation for the test problems of aeroelasticity, confirming the validity and correctness of the selected approach and simulation tool are presented. For calculations of problems the cutting-edge technologies of numerical analysis, implemented into numerical simulation packages ANSYS / Mechanical and ANSYS / CFX, were used. The research of the gas flow rate effect on the dynamic behavior of the blade was carried out.

Key words: aerodynamics, aeroelasaticity, vibrations, flutter, turbine,  rotor wheel, numerical simulation.