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Research Papers

Heat Transfer Measurements Downstream of Trenched Film Cooling Holes Using a Novel Optical Two-Layer Measurement Technique

[+] Author and Article Information
Peter Schreivogel

Institut für Thermodynamik,
Fakultät für Luft- und Raumfahrttechnik,
Universität der Bundeswehr München,
Neubiberg 85577, Germany
e-mail: peter.schreivogel@unibw.de

Michael Pfitzner

Professor
Institut für Thermodynamik,
Fakultät für Luft- und Raumfahrttechnik,
Universität der Bundeswehr München,
Neubiberg 85577, Germany
e-mail: michael.pfitzner@unibw.de

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received September 29, 2015; final manuscript received October 15, 2015; published online November 24, 2015. Editor: Kenneth C. Hall.

J. Turbomach 138(3), 031003 (Nov 24, 2015) (9 pages) Paper No: TURBO-15-1211; doi: 10.1115/1.4031919 History: Received September 29, 2015; Revised October 15, 2015; Accepted October 19, 2015

A new approach for steady-state heat transfer measurements is proposed. Temperature distributions are measured at the surface and a defined depth inside the wall to provide boundary conditions for a three-dimensional heat flux calculation. The practical application of the technique is demonstrated by employing a superposition method to measure heat transfer and film cooling effectiveness downstream of two different 0.75D deep narrow trench geometries and cylindrical holes. Compared to the cylindrical holes, both trench geometries lead to an augmentation of the heat transfer coefficient supposedly caused by the highly turbulent attached cooling film emanating from the trenches. Areas of high heat transfer are visible, where recirculation bubbles or large amounts of coolant are expected. Increasing the density ratio from 1.33 to 1.60 led to a slight reduction of the heat transfer coefficient and an increased cooling effectiveness. Both trenches provide a net heat flux reduction (NHFR) superior to that of cylindrical holes, especially at the highest momentum flux ratios.

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References

Behrendt, T. , Lengyel, T. , Hassa, C. , and Gerendas, M. , 2008, “ Characterization of Advanced Combustor Cooling Concepts Under Realistic Operating Conditions,” ASME Paper No. GT2008-51191.
Bunker, R. S. , 2002, “ Film Cooling Effectiveness Due to Discrete Holes Within a Transverse Surface Slot,” ASME Paper No. GT2002-30178.
Dorrington, J. , Bogard, D. , and Bunker, R. , 2007, “ Film Effectiveness Performance for Coolant Holes Embedded in Various Shallow Trench and Crater Depressions,” ASME Paper No. GT2007-27992.
Lu, Y. , Dhungel, A. , Ekkad, S. , and Bunker, R. , 2009, “ Effect of Trench Width and Depth on Film Cooling From Cylindrical Holes Embedded in Trenches,” ASME J. Turbomach., 131(1), p. 011003. [CrossRef]
Kröss, B. , and Pfitzner, M. , 2012, “ Numerical and Experimental Investigation of the Film Cooling Effectiveness and Temperature Field Behind a Novel Trench Configuration at High Blowing Ratio,” ASME Paper No. GT2012-68125.
Schreivogel, P. , Kröss, B. , and Pfitzner, M. , 2014, “ Density Ratio Effects on the Flow Field Emanating From Cylindrical Effusion and Trenched Film Cooling Holes,” ASME Paper No. GT2014-25143.
Schreivogel, P. , Kröss, B. , and Pfitzner, M. , 2014, “ Study of an Optimized Trench Film Cooling Configuration Using Scale Adaptive Simulation and Infrared Thermography,” ASME Paper No. GT2014-25144.
Eckert, E. , 1984, “ Analysis of Film Cooling and Full-Coverage Film Cooling of Gas Turbine Blades,” ASME J. Eng. Gas Turbines Power, 106(1), pp. 206–213. [CrossRef]
Gritsch, M. , Baldauf, S. , Martiny, M. , Schulz, A. , and Wittig, S. , 1999, “ The Superposition Approach to Local Heat Transfer Coefficients in High Density Ratio Film Cooling Flows,” ASME Paper No. 99-GT-168.
Goldstein, R. , and Taylor, J. , 1982, “ Mass Transfer in the Neighborhood of Jets Entering a Crossflow,” ASME J. Heat Transfer, 104(4), pp. 715–721. [CrossRef]
Goldstein, R. , Jin, P. , and Olson, L. , 1999, “ Film Cooling Effectiveness and Mass/Heat Transfer Coefficient Downstream of One Row of Discrete Holes,” ASME J. Turbomach., 121(2), pp. 225–232. [CrossRef]
Baldauf, S. , Schulz, A. , and Wittig, S. , 2001, “ High-Resolution Measurements of Local Heat Transfer Coefficients From Discrete Hole Film Cooling,” ASME J. Turbomach., 123(4), pp. 749–757. [CrossRef]
Ekkad, S. , Zapata, D. , and Han, J. , 1997, “ Heat Transfer Coefficients Over a Flat Surface With Air and CO2 Injection Through Compound Angle Holes Using a Transient Liquid Crystal Image Method,” ASME J. Turbomach., 119(3), pp. 580–586. [CrossRef]
Ammari, H. , Hay, N. , and Lampard, D. , 1990, “ The Effect of Density Ratio on the Heat Transfer Coefficient From a Film-Cooled Flat Plate,” ASME J. Turbomach., 112(3), pp. 444–450. [CrossRef]
Boyd, E. , McClintic, J. , Chavez, K. , and Bogard, D. , 2014, “ Direct Measurement of Heat Transfer Coefficient Augmentation at Multiple Density Ratios,” ASME Paper No. GT2014-27085.
Hakenesch, P. , 1999, “ Thin Layer Thermography—A New Heat Transfer Measurement Technique,” Exp. Fluids, 26(3), pp. 257–265. [CrossRef]
Chambers, M. , and Clarke, D. , 2009, “ Doped Oxides for High-Temperature Luminescence and Lifetime Thermometry,” Annu. Rev. Mater. Res., 39(1), pp. 325–359. [CrossRef]
Schreivogel, P. , and Pfitzner, M. , 2015, “ Optical Convective Heat Transfer Measurements Using Infrared Thermography and Frequency Domain Phosphor Thermometry,” Int. J. Heat Mass Transfer, 82, pp. 299–308. [CrossRef]
Ochs, M. , Horbach, T. , Schulz, A. , Koch, R. , and Bauer, H.-J. , 2009, “ A Novel Calibration Method for an Infrared Thermography System Applied to Heat Transfer Experiments,” Meas. Sci. Technol., 20, pp. 1–9. [CrossRef] [PubMed]
Seat, H. , Sharp, J. , Zhang, Z. , and Grattan, K. , 2002, “ Single-Crystal Ruby Fiber Temperature Sensor,” Sens. Actuators, A, 101(1--2), pp. 24–29. [CrossRef]
Atakan, B. , Eckert, C. , and Pflitsch, C. , 2009, “ Light Emitting Diode Excitation of Cr3+:Al2O3 as Thermographic Phosphor: Experiments and Measurement Strategy,” Meas. Sci. Technol., 20(7), p. 075304. [CrossRef]
Aizawa, H. , Sekiguchi, M. , Katsumata, T. , Komuro, S. , and Morikawa, T. , 2006, “ Fabrication of Ruby Phosphor Sheet for the Fluorescence Thermometer Application,” Rev. Sci. Instrum., 77, p. 044902. [CrossRef]
Bouguet, J.-Y. , 2013, “ Camera Calibration Toolbox for Matlab,” California Institute of Technology, Pasadena, CA, www.vision.caltech.edu/bouguetj/calib_doc/
Baldauf, S. , Scheurlen, M. , Schulz, A. , and Wittig, S. , 2002, “ Heat Flux Reduction From Film Cooling and Correlation of Heat Transfer Coefficients From Thermographic Measurements at Enginelike Conditions,” ASME J. Turbomach., 124(4), pp. 699–709. [CrossRef]
Kays, W. , Crawford, M. E. , and Weigand, B. , 2005, Convective Heat and Mass Transfer, McGraw-Hill, New York.
Moffat, R. , 1988, “ Describing the Uncertainties in Experimental Results,” Exp. Therm. Fluid Sci., 1(1), pp. 3–17. [CrossRef]
Sinha, A. , Bogard, D. , and Crawford, M. E. , 1991, “ Film-Cooling Effectiveness Downstream of a Single Row of Holes With Variable Density Ratio,” ASME J. Turbomach., 113(3), pp. 442–449. [CrossRef]
Ammari, H. , Hay, N. , and Lampard, D. , 1991, “ Effect of Acceleration on the Heat Transfer Coefficient on a Film-Cooled Surface,” ASME J. Turbomach., 113(3), pp. 464–471. [CrossRef]
Saumweber, C. , and Schulz, A. , 2012, “ Free-Stream Effects on the Cooling Performance of Cylindrical and Fan-Shaped Cooling Holes,” ASME J. Turbomach., 134(6), p. 061007. [CrossRef]
Davidson, F. , Kistenmacher, D. , and Bogard, D. , 2013, “ Film Cooling With a Thermal Barrier Coating: Round Holes, Craters and Trenches,” ASME J. Turbomach., 136(4), p. 041007. [CrossRef]

Figures

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Fig. 1

Wind tunnel test section

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Fig. 2

Schematic of test plate composition (dimensions in mm)

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Fig. 3

Average phosphor calibration curve

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Fig. 4

Cooling hole configurations

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Fig. 5

Laterally averaged heat transfer coefficients for three different wall temperatures (T, DR = 1.6, I = 8)

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Fig. 6

Centerline cooling effectiveness downstream a cylindrical hole [5,27] (C, DR = 1.6, M = 1)

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Fig. 7

Comparison of laterally averaged heat transfer coefficients of the cylindrical holes (C) and straight trench (T) to literature data [4,28]

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Fig. 8

Trench adiabatic cooling effectiveness, DR = 1.33

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Fig. 9

Trench laterally averaged cooling effectiveness for DR = 1.33 and 1.60

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Fig. 10

Heat transfer coefficient augmentation, DR = 1.33

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Fig. 11

Trench laterally averaged heat transfer coefficient augmentation for DR = 1.33 and 1.60

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Fig. 12

CFD simulation of the trench flow field, DR = 1.33, I = 8

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Fig. 13

Spatially averaged NHFR (C-cylindrical hole, T-straight trench, S-segmented trench)

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