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Optical Engineering

Test Of Jet Engine Turbine Blades By Thermography
Author(s): Kurt Ding
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Paper Abstract

Two applications of thermography for testing and development of turbomachinery components are described: (1) Fabrication defects in the cooling system of internally cooled turbine blades are detected by transient heating of the blade and measurement of its surface temperature distribution by an infrared imaging system. Defects like blocking, narrowing, widening, and mispositioning of cooling channels can clearly be identified by the disturbance of the transient surface temperature distribution of the blade. (2) To improve the cooling configuration of turbine blades, the cooling effectiveness over the total blade surface must be determined under test conditions similar to those in the turbomachine. The infrared measurement of blade surface temperature distributions in a hot air cascade and the method to correct the infrared intensities for radiation reflected at the measuring surface are illustrated in an example.

Paper Details

Date Published: 1 December 1985
PDF: 5 pages
Opt. Eng. 24(6) 241055 doi: 10.1117/12.7973629
Published in: Optical Engineering Volume 24, Issue 6
Show Author Affiliations
Kurt Ding, MTU Motoren- und Turbinen-Union Munchen GmbH (Germany)


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