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Steady IR Methodology for Leading Edge Impingement Measurements

[+] Author Affiliations
David B. Helmer

GE Global Research, Niskayuna, NY

Florian Hoefler

GE Global Research Europe, Garching, Germany

Paper No. GT2015-42643, pp. V05AT11A012; 10 pages
  • ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
  • Volume 5A: Heat Transfer
  • Montreal, Quebec, Canada, June 15–19, 2015
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5671-0
  • Copyright © 2015 by ASME


A steady-state IR measurement is described and demonstrated for a leading edge crossover impingement configuration. Thin-walled leading edge models are used, with a constant heat flux boundary condition generated. This approach allows for rapid and low-cost hardware manufacture while simultaneously providing improved measurement quality. Test time is heavily reduced relative to traditional liquid crystal tests, and data processing is substantially simplified from transient methodologies. The thin walls minimize the impact of lateral conduction and simplify the conduction corrections. The methodology is demonstrated on a test for a blade-relevant leading edge impingement geometry, with a detailed uncertainty analysis provided.

Copyright © 2015 by ASME



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