Ångström methods applied to simultaneous measurements of thermal diffusivity and heat transfer coefficients: Part 2, experimental

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To predict operational temperatures of turbine buckets, two of the fundamental properties needed are: the effective thermal conductivity of the bucket material(s) and the heat transfer coefficient of any active cooling within internal passages. For their simultaneous measurement we applied a thermal wave method as outlined in Part 1 to a simulated turbine bucket. We employed a modulated electron beam as the heating source and used a previously measured alloy for the bucket wall so only the heat transfer coefficients were needed. We measured the heat transfer coefficients to ± 10%.