An infrared thermography imaging system is described for spatially resolved convective heat transfer measurements when used in conjunction with thermocouples, energy balances, digital image processing, zinc-selenide windows, and unique in situ calibration procedures. The usefulness of the system and the techniques developed are demonstrated by measurements made in two different environments with complex, three-dimensional flow features. First, spatial variations of surface Nusselt numbers are measured along the concave surfaces of a swirl chamber whose geometry models an internal passage used to cool the leading edge of a turbine blade. Second, spatially resolved distributions of the adiabatic film-cooling effectiveness are measured downstream of film-cooling holes on a symmetric turbine blade in transonic flow.
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