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TECHNICAL PAPERS

A Novel Transient Heater-Foil Technique for Liquid Crystal Experiments on Film-Cooled Surfaces

[+] Author and Article Information
G. Vogel, A. B. A. Graf

Laboratoire de Thermique Appliquée et de Turbomachines (LTT), EPFL, 1015 Lausanne, Switzerland

J. von Wolfersdorf, B. Weigand

Institut für Thermodynamik der Luft- und Raumfahrt, Universität Stuttgart, 70569 Stuttgart, Germany

J. Turbomach 125(3), 529-537 (Oct 29, 2002) (9 pages) doi:10.1115/1.1578501 History: Received October 10, 2001; Revised October 29, 2002
Copyright © 2003 by ASME
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References

Goldstein, R. J., 1971, “Film Cooling,” Advances in Heat Transfer, eds., T. F. Irvine and J. P. Hartnett, Academic Press, New York, Vol. 7, pp. 321–379.
VKI Lecture Series, 1982, “Film Cooling and Turbine Blade Heat Transfer,” VKI-LS 82-02.
Leontiev,  A. I., 1999, “Heat and Mass Transfer Problems for Film Cooling,” ASME J. Heat Transfer, 121, pp. 509–527.
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.
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.
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Weigand, B., Bonhoff, B., and Ferguson, J., 1997, “A Comparative Study Between 2D Boundary Layer Predictions and 3D Navier-Stokes Calculations for a Film Cooled Vane,” Proc., U.S. National Heat Transfer Conference, Baltimore, HTD 350, pp. 213–221.
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Lutum,  E., von Wolfersdorf,  J., Weigand,  B., and Semmler,  K., 2000, “Film Cooling on a Convex Surface with Zero Pressure Gradient Flow,” Int. J. Heat Mass Transfer, 43, pp. 2973–2987.
Reiss, H., 1998, “The Transient Liquid Crystal Technique Employed for Sub- and Transonic Heat Transfer and Film Cooling Measurements in a Linear Cascade,” 14th bi-annual symposium on Measurement Techniques in Transonic and Supersonic Flow in Cascades and Turbomachines.
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 .
von Wolfersdorf,  J., Hoecker,  R., and Sattelmayer,  T., 1993, “A Hybrid Transient Step-Heating Heat Transfer Measurement Technique Using Heater Foils and Liquid-Crystal Thermography,” ASME J. Heat Transfer, 115, pp. 319–324.
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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.
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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.
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.
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Figures

Grahic Jump Location
Schema of the solid plane plate with the heater-foil, the coolant injection, cooling holes, the main gas flow, and some relevant physical quantities
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Schematic drawing of the test facility and the devices present around the test section
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Film-cooled flat plate heater-foils and bus bars configurations
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Relative error evolution with the increase of the number of experiments used for the regression analysis
Grahic Jump Location
From measurements derived (left) and calculated (right) dimensionless reference heat flux distribution for cases 1 and 2
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Spatial distributions of heat transfer coefficients and adiabatic film cooling effectiveness
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Lateral-averaged values of the heat transfer coefficient and the adiabatic film-cooling effectiveness (derived from the data given in Fig. 6)

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