engleski

Steady-State Creep of the Gas Turbine Disk - an Analytical Approach

The disk of the gas turbine rotor is usually performed as a disk of variable thickness. It is fixed by clamp connection on the turbine shaft or some other constructive solution is applied. At the stationary operation the disk is exposed to great mechanical and thermal loads. This primarily refers to the centrifugal forces of the disk´s own mass and the centrifugal forces of the blades, all at the speed of, for example, n = 7200 rpm. Regarding thermal loads, the disk is exposed to the stationary temperature field at the temperature of T = 600 0C. The creep of the disk will be especially expressed at so high temperatures and long duration of continuous operation. The creep of the disk will particularly influence disk´s displacements. In order to endure this high loads, the disk material has to be high strength alloyed steel as, for example, 45Cr14Ni14W2Mo, which in addition has a great elongation. The stresses and displacements at the stationary state which are the consequence of the creeping of a disk material are analyzed in this paper. The analysis was performed by analytical methods in the combination with contemporary mathematical tools. The software Wolfram Mathematica was used for the all numerical calculations.

Gas turbine disk ; stationary temperature field ; steady-state creep ; mechanical and thermal load of the disk ; stresses and the displacements in the disk in the steady-state creep conditions ; analytical methods.

Rad je izložen (PowerPoint Presentation) i objavljen na 10th International Congress of Croatian Society of Mechanics (10th ICCSM) koji je održan u Puli, Hrvatska, od 28. do 30. rujna 2022. godine.