Abstract
A turbine compressor package is used for pipeline gas transmission. When operating, compressor turbine blades develop vibration, which increases the number of dynamic stress cycles and results in the blade failure. The present study aims to determine the frequency of natural blade vibration and to consider it in the context of the blade repair process. In the first stage of the study, an oscillating contour is developed to generate standing oscillation wave which characteristics are used as experimental data. To process those data, a mathematical model is developed to calculate the blade resonant frequency. Finally, the boundaries of the assured quality area are determined. Blade operation capacity analysis method will allow us to reduce the number of environmentally dangerous experiments.
Highlights
Cause analysis of turbine and compressor blades vibration
High blade vibration frequencies result in rapid accumulation of number of stress cycles and in blade failure, especially if there are some factors of fatigue resistance reduction: corrosive or erosive damages, dints, material defects, structural stress raisers, residual stress in material surface layers etc. [2; 3]
Since we are developing new technique for experimental data processing, we can select those geometrical parameters of test samples which simplify experiment and its analysis
Summary
Cause analysis of turbine and compressor blades vibration. In the process of gas compressor package operation stator and rotor blades of turbines and compressors vibrate, i.e. oscillate mechanically what is the main cause of blade failure. High blade vibration frequencies result in rapid accumulation of number of stress cycles and in blade failure, especially if there are some factors of fatigue resistance reduction: corrosive or erosive damages, dints, material defects, structural stress raisers, residual stress in material surface layers etc. According to the nature of the factors causing blade vibration, oscillations can be classified into: forced oscillations, stall oscillations and self-oscillations. Stall oscillations are caused by possible non-periodic blade slaps while operating in abnormal modes. Frequency of such oscillations are equal to the first natural frequency of blade oscillation. Selfoscillation is a kind of aeroelasticity phenomenon; it is analogous to so-called bendingtorsional flutter .Self-oscillations occur in the absence of distortions, pulsations or stall
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