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An Attempt Of Evaluation Of Overheating Of Gas Turbine Blades

Bogdan M.

Journal of Polish CIMAC

2008

Vol. 3, no 2

9-13

Increase of sensitivity and reliability of non-destructive diagnosing of condition of gas turbine blades became possible thanks to discovery of relevance and relationship between change of colour of their surface and change of microstructure of material resulting from influence of high temperatures. The data in the form of digital images were obtained in lab conditions with help of a photosensitive element i.e. a CCD matrix (digital camera). Acquired images were split up to main primary colours i.e. red, green and blue. This allowed to obtain information about variations of colour intensity for individual channels of digital images and for various temperatures applied for heating of blades. Thus, from the point of view of diagnostics of technical objects, with help of a non-invasive method obtained was the important diagnostic information, i.e. change of luminance and chrominance resulting from influence of high temperature on blades. Researched was also the microstructure of surface and sub-surface layer (change of thickness of coating, change of distribution and size of excretions of reinforcing phase y psilon). Obtained information may be useful for evaluation of microstructure of material in the course of operation of gas turbine blades.