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Towards an Improved Lifing Methodology for Thermocouple Probes Used in Gas Turbines

[+] Author Affiliations
Michele Scervini, Catherine Rae

University of Cambridge, Cambridge, UK

Richard Page, Mark Rudkin, Daniel Loveless, Stephen O’Dell

Esterline Advanced Sensors, Farnborough, UK

Paper No. GT2018-76221, pp. V006T05A018; 13 pages
doi:10.1115/GT2018-76221
From:
  • ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
  • Volume 6: Ceramics; Controls, Diagnostics, and Instrumentation; Education; Manufacturing Materials and Metallurgy
  • Oslo, Norway, June 11–15, 2018
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5112-8
  • Copyright © 2018 by ASME

abstract

The reliability of temperature probes in gas turbines is dependent on their capability to withstand the harsh environment they experience when installed in an engine. The severe conditions sensors experience during operation requires the use of appropriate methodologies to assess their life. During the ALPHET project the University of Cambridge and Esterline Advanced Sensors have been working on developing an advanced lifing methodology: in order to predict the life of thermocouple probes used in gas turbines, this combines accelerated laboratory tests based on the salt deposition method, combustor rig tests, metallurgical analysis of probes returned after engine service and information extracted from their associated temperature data acquired during their long term operation in aero gas turbines.

The work included analysis of materials used in current temperature probes and investigation of advanced materials for future thermocouple sensors that will work at temperatures higher than today’s probes.

This paper will summarise the main features of the improved lifing methodology and the challenges associated with the use of complex engineering data obtained from engines.

Copyright © 2018 by ASME

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