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TECHNICAL PAPERS

The Measurement of Full-Surface Internal Heat Transfer Coefficients for Turbine Airfoils Using a Nondestructive Thermal Inertia Technique

[+] Author and Article Information
Nirm V. Nirmalan, Ronald S. Bunker, Carl R. Hedlund

Global Research Center, General Electric Company, Niskayuna, NY 12309

J. Turbomach 125(1), 83-89 (Jan 23, 2003) (7 pages) doi:10.1115/1.1515798 History: Received October 04, 2001; Online January 23, 2003
Copyright © 2003 by ASME
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References

Bantel, T. E, and Mack, D. C., 1987, “Cooling Hole Inspection,” US Patent No. 4,644,162, assigned to General Electric Co.
Bantel, T. E., 1992, “Apparatus and Method for Inspecting Cooling Holes,” US Patent No. 5,111,046, assigned to General Electric Co.
Daniels, A., 1996, “Nondestructive Pulsed Infrared Quantitative Evaluation of Metals,” Thermosense XVIII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, Society of Photo-Optical Instrumentation Engineers, SPIE Vol. 2766, pp. 185–201.
Beckeiz, E., Sperling, A., and Carl, V., 1998, “Thermography Inspection System for Gas Turbine Blades,” 7th ECNDT, Copenhagen, Denmark.
Stiglich, J. J., Bishop, C. C., Daleo, J. A., Boone, D. H., and Eelkema, T. E., 1998, “The Thermal Inertia Analysis Technique in Gas Turbine Component Reliability Assessment,” presented at the ASM Gas Turbine Materials Technology Conference, Rosemont IL.
Kline and McClintock, 1953, “Describing Uncertainties in Single-Sample Experiments,” Mech. Eng. (Am. Soc. Mech. Eng.), Jan.
Florschuetz,  L., Truman,  C., and Metzger,  D., 1981, “Streamwise Flow and Heat Transfer Distributions for Jet Array Impingement with Crossflow,” ASME J. Heat Transfer, 103, pp. 337–342.

Figures

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Flow stand and heater test arrangement
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Elliptic airfoil with Impingement cooling (insert photo shows the array size and location)
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Typical surface temperatures at some time during transient test
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Experimental data for jet average Re of 16,636 as reduced with 1-D lumped capacity model (W/m2/K)
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Experimental data for jet average Re of 7,016 as reduced with 1-D lumped capacity model (W/m2/K)
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Comparison of 1-D results with impingement array correlation of Florschuetz et al. 7 (W/m2/K)
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3-D ANSYS results for internal HTCs with convergence criteria of 0.5°C and 4×4 pixel averaging (W/m2/K)
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3-D ANSYS results for internal HTCs with convergence criteria of 0.5°C and 3×3 pixel averaging (W/m2/K)
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Effect of surface temperature convergence criterion
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Comparison of 1-D and 3-D results
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Internal heat transfer coefficients with blocked impingement holes (W/m2/K)

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