Research of Vibration Characteristics of Rotor Blades of Low-pressure Compressor of GTE DN80

Abstract

Gas-turbine engines (GTE) are the basis of the modern power plants. At the facilities of PJSC “Gazprom”, gas-compressor units with gas-turbine engines DU80 and DN80 with a power of 25 MW manufactured by “Zorya-Mashproekt” company are used. These GTEs are characterized by a certain imperfection of the design and poor embodiment of the blade apparatus of the 3rd and 4th stages of the low-pressure compressor (LPC), which entails premature exit of the engines from operation and increased repair costs. Measuring device PRIZ-1 developed by Samara University is briefly described, which was used to research the vibration characteristics of the rotor blades of the 3rd and 4th stages of the LPC of GTE DN80 in the conditions of the test bench of PJSC “Tyumenskie Motorostroiteli”. The article presents the results of the performed non-contact measurements of the deformational state parameters of the 3rd and 4th blade stages of LPC of the GTE DN80: the static position of the blades; amplitudes of bending oscillations of the blades; gaps between the blade tips and the inner surface of the housing; amplitudes of torsional oscillations of the blades; changes in the twist angle of the blades. Examples of visualizations of the measured parameters are presented. The results of research of the vibration characteristics of LPC blades will be used in the process of design and technological works aimed at fine-tuning, increasing the reliability of the blade apparatus and increasing the overhaul life of the DN80 gas turbine engine.