Thermographic Control with Ultrasonic Heating Stimulation of the Gas Turbine Engine First Stage Work Blade

Aeronautical and Space-Rocket Engineering


Аuthors

Zhukov O. M.*, Shiryaev E. A.**, Vdovenko A. G.***

United Engine Corporation “Saturn”, 163, Lenin av., Rybinsk, Yaroslavl region, 152903, Russia

*e-mail: gerbant876@gmail.com
**e-mail: evgeny.shiryaev@uec-saturn.ru
***e-mail: vdovenko_ag@mail.ru

Abstract

Engine-building is one of the most important branches of machine building and involves scores of different operations to manufacture a product, in this case an engine that meets quality requirements. Thus, it is necessary to perform quality control at all stages of the production cycle while their production.
Of all the variety of engines, gas turbine engines have found wide application in aviation, marine and ground-based technology, performing various tasks. The working blades of a gas turbine engine are the part of the critically important purpose determining basically its performance. In the course of operation, the working blade sustain various types of loads: temperature, bending, abrasive, etc. Thus, there is a high probability of blades damaging during operation, and special attention should be paid to their condition monitoring.
The authors conducted the study aimed at the possibility of applying an innovative method of non-destructive testing, namely thermographic method with ultrasonic stimulation of heating to the working blade of the first stage of a gas turbine engine as an alternative to the classical capillary inspection for the defects detecting. The thermographic method of non-destructive testing with ultrasonic stimulation of heating is based on the combined employing of ultrasonic stimulation technology and infrared imaging equipment such as thermal imagers. Under the effect of ultrasonic vibrations, the defective areas of the blades begin emitting heat, and this phenomenon is being recorded by a thermal imager. There is no temperature increase herewith in the areas without defects, which increases the possibility of the defects location detecting.
It should be noted as well that there is a ceramic heat-protecting coating of high roughness on the pen surface and the shank track shelves, affecting positively the possibility of the thermal imaging of these areas. The best results of such imaging are being obtained when controlling matte surfaces, since their radiation coefficient is higher.
To determine the causes of the local temperature increase, the authors conducted a metallographic study of these zones. According to which results of it was found that an increase in temperature under the impact of ultrasonic vibrations occurs in places with defects such as cracks, laminations and peeling of the ceramic thermal protective coating.

Keywords:

First stage working blade, thermographic control, ultrasonic stimulation, heat-resistant nickel alloy, thermogramm, temperature profile, thermal-protective coating defects

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