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.
Issue Section:
Technical Papers
1.
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2.
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3.
Leontiev
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, “Heat and Mass Transfer Problems for Film Cooling
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.4.
Sinha, A. K., Bogard, D. G., and Crawford, M. E., 1990, “Film Cooling Effectiveness Downstream of a Single Row of Holes with Variable Density Ratio,” 90-GT-43.
5.
Forth, C. J., Loftus, P. J., and Jones, T. V., 1980, “The Effect of Density Ratio on the Film Cooling of a Flat Plate,” AGARD CP 390, Bergen.
6.
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.8.
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9.
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10.
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11.
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12.
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15.
Dui, H., Han, J. C., and Ekkad, V., 1997, “Detailed Film Cooling Measurements Over a Gas Turbine Blade Using a Transient Liquid Crystal Image Technique,” HTD 350, National Heat Transfer Conference, 12.
16.
von Wolfersdorf
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.17.
Turnbull, W. N., and Oosthuizen, P. H., 1999, “A New Experimental Technique for Measuring Surface Heat Transfer Coefficients Using Uncalibrated Liquid Crystals,” ASME HTD-Vol. 364-4, pp. 121–126.
18.
Farmer, J. P., Seager, D. J., and Liburdy, J. A., 1997, “The Effect of Shaping Inclined Slots on Film Cooling Effectiveness and Heat Transfer Coefficient,” ASME 97-GT-339.
19.
Seager, D. J., and Liburdy, J. A., 1997, “Experimental Investigation of the Effects of Compound-Angle Holes on Film Cooling Effectiveness and Heat Transfer Performance Using a Transient Liquid Crystal Thermometry Technique,” Optical Technology in Fluid, Thermal and Combustion Flow III, SPIE, 3172, pp. 173–182.
20.
Vogel, G., Graf, A., and Weigand, B., 2002, “Film Cooling: A Comparative Study of Different Heater-Foil Configurations for Liquid Crystal Experiments,” ASME GT-2002-30552.
21.
Vogel, G., and Weigand, B., 2001, “A New Evaluation Method for Transient Liquid Crystal Experiments,” NHTC01-1511, 35th ASME National Heat Transfer Conference, Anaheim, CA.
22.
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23.
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24.
Vogel, G., and Bo¨lcs, A., 2000, “A Novel Digital Image Processing System for the Transient Liquid Crystal Technique applied for Heat Transfer and Film Cooling Measurements,” ICHMT Paper, Turbine 2000 Symposium, Cesme, Turkey.
25.
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26.
Wiedner
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.27.
Baldauf, S., Schulz, A., Wittig, S., and Schleurlen, M., 1997, “An Overall Correlation of Film Cooling Effectiveness from One Row of Holes,” 97-GT-79.
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