A non-destructive method to assess condition of gas turbine blades, based on the analysis of blade-surface images

Аннотация

There is a non-destructive method to assess condition of gas turbine blades in the article presented. The method is based on the processing of blade-surface images in visible band of the electromagnetic wave. Presented are also the results of research into the influence of high-temperature loads on blades of a gas turbine. The relations are shown between the temperature of heat treatment of the blades and a change in colour of blade surfaces as well as changes in the micro structure of the blade material. These relations are suitable for the assessment of changes in the microstructure, which result from the supercritical temperature of the working medium affecting the blade. The method can prove useful for the in-service assessment of the blade material's overheating level.