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

To predict operational temperatures of turbine buckets, two of the fundamen tal 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 I to a simulated turbine bucket. We employ ed a modulated electron beam as the heating source and used a previously me asured alloy for the bucket wall so only the heat transfer coefficients wer e needed. We measured the heat transfer coefficients to +/- 10%. (C) 1999 E lsevier Science Ltd.