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Analysis of applicability of thermography to assess health of gas turbine blades

100%

Kułaszka A. , Błachnio J.

tom Vol. 20, No. 2

237--244

A gas turbine is one of the most heavily loaded, both mechanically and thermally, structural components of an aircraft turbine engine. Hence, the most common reasons for failure are overheating and thermal fatigue of the blade material. It is of great significance for the safety of aeronautical systems that service is monitored; this is carried out to verify the health of these items using all available diagnostic methods. The primary aim is to detect and identify, as early as possible, any probable hazards to the engine. The preliminary assessment of the gas turbine blades condition is carried out via a visual inspection e.g. using a video borescope. During any repair, the preliminary assessment is conducted with a visual method, which is followed with some other non-destructive inspection techniques, e.g. flaw detection, intended to provide full colour images. The essential assessment of the blade condition consists in metallographic examination which precludes further operational use of the item. Probable errors in this assessment usually result in considerable cost of unnecessary repairs of the entire engine. Presented in the paper is the pulse thermography technique being a new NDT method, which is capable of diagnosing changes in the blade condition and to detect early stages of damages to turbine blades. Results of inspections of the blades subjected to high temperature and corresponding changes in signals of thermal response of the blade material stimulated with a heat pulse have also been given. Effects of the testing work have been used to detect changes, against temperature, in thermophysical properties of super alloy used in gas turbine blades. The results have been successfully verified using metallographic examination. To conclude: the thermographic method provides good reliability of the assessment of changes in the microstructure of the blade.

Perspectives on avation training in Polish Universities

75%

Marszałkiewicz J.

tom Y. 112, iss. 4-M

93--101

This article presents the potential for development of aviation education at Polish Universities with a focus on aircraft mechanics training certified by the Civil Aviation Authority in Warsaw and the European Aviation Safety Agency (EASA). An engineering graduate who obtains such a licence in addition to having a diploma would have no problems with finding a suitable employment.

W artykule przedstawiono potencjalne możliwości rozwoju kształcenia lotniczego na polskich uczelniach, z naciskiem na szkolenie mechaników lotniczych certyfikowanych przez Urząd Lotnictwa Cywilnego w Warszawie oraz Europejską Agencję Bezpieczeństwa Lotnictwa EASA. Absolwent studiów inżynierskich, który obok dyplomu, miałby tego rodzaju licencje, nie powinien mieć problemów ze znalezieniem dobrej pracy.