About possibilities of change of a spectrum of eigenfrequency and vibratory stress rotor wheel of turbines aviation gas-turbine engines

A.E. Zanin, A.P. Zinkovsky, A.V. Sheremetev

Results of the executed numerical researches by definition possibilities tuning out from dangerous resonant fluctu-ations of driving wheels of turbines aviation gas-turbine engines at the expense of minor alterations of the geometrical sizes of their making constructive elements are presented. Results of computing experiments are compared to data strain-gage testing. There were formed new blade and disc model of free turbine. There were offered the recommendations for the mounting of transmitters. The calculation results were compared with the experimental data. There was shown, that tuning out from dangerous vibration frequency was conduct and there was obtained a good accordance between calculations and strain-gage testing.

Key words: gas-turbine engines, the turbine, the driving wheel, blade row, cyclic symmetry, a spectrum of eigenfrequency, resonant fluctuations.