A novel transient measurement technique has been developed for determining the heat transfer characteristics in the presence of film cooling (heat transfer coefficient and adiabatic film-cooling effectiveness). The method is based on a transient heater foil technique, where a non-homogeneous surface heat flux is applied to the test surface. A regression analysis of multiple transient liquid crystal experiments is used to obtain the heat transfer characteristics. The method introduced here has the advantage that the (often not known) heat flux distribution at the surface is not needed for the analysis of the measured data. The method is used to study the influence of several heater foil configurations on a flat plate with film cooling, elucidating the effect of different thermal boundary conditions on film-cooling performance. The obtained data is also compared to results presented in literature and good agreement is found.
A Novel Transient Heater-Foil Technique for Liquid Crystal Experiments on Film-Cooled Surfaces
Contributed by the International Gas Turbine Institute and presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Amsterdam, The Netherlands, June 3–6, 2002. Manuscript received by the IGTI October 10, 2001; revised manuscript received October 29, 2002. Paper No. 2002-GT-30552. Review Chair: E. Benvenuti.
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Vogel , G., Graf, A. B. A., von Wolfersdorf , J., and Weigand, B. (October 29, 2002). "A Novel Transient Heater-Foil Technique for Liquid Crystal Experiments on Film-Cooled Surfaces ." ASME. J. Turbomach. July 2003; 125(3): 529–537. https://doi.org/10.1115/1.1578501
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