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TECHNICAL PAPERS

A Detailed Analysis of Film Cooling Physics: Part II—Compound-Angle Injection With Cylindrical Holes

[+] Author and Article Information
K. T. McGovern, J. H. Leylek

Department of Mechanical Engineering, Clemson University, Clemson, SC 29634

J. Turbomach 122(1), 113-121 (Feb 01, 1997) (9 pages) doi:10.1115/1.555434 History: Received February 01, 1997
Copyright © 2000 by ASME
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References

Schmidt,  D., Sen,  B., and Bogard,  D., 1996, “Film Cooling With Compound Angle Holes: Adiabatic Effectiveness,” ASME J. Turbomach., 118, pp. 807–813.
Sen,  B., Schmidt,  D., and Bogard,  D., 1996, “Film Cooling With Compound Angle Holes: Heat Transfer,” ASME J. Turbomach., 118, pp. 300–306.
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, pp. 580–586.
Ekkad,  S., Zapata,  D., and Han,  J., 1997, “Film Effectiveness Over a Flat Surface With Air and CO2 Injection Through Compound Angle Holes Using a Transient Liquid Crystal Image Method,” ASME J. Turbomach., 119, pp. 587–593.
Ligrani,  P., Wigle,  J., Ciriello,  S., and Jackson,  S., 1994, “Film Cooling From Holes With Compound Angle Orientations, Part I: Results Downstream of Two Staggered Rows of Holes With 3D Spanwise Spacing,” ASME J. Heat Transfer, 116, pp. 341–352.
Ligrani,  P., Wigle,  J., and Jackson,  S., 1994, “Film Cooling From Holes With Compound Angle Orientations, Part II: Results Downstream of a Single Row of Holes With 6D Spanwise Spacing,” ASME J. Heat Transfer, 116, pp. 353–362.
Lee,  S., Kim,  Y., and Lee,  J., 1997, “Flow Characteristics and Aerodynamic Losses of Film-Cooling Jets With Compound Angle Orientations,” ASME J. Turbomach., 119, pp. 310–319.
Butkiewicz, J., Walters, D., McGovern, K., and Leylek, J., 1995, “A Systematic Computational Methodology Applied to a Jet-in-Crossflow—Part 1: Structured Grid Approach,” ASME Paper No. 95-WA/HT-2.
Walters, D., McGovern, K., Butkiewicz, J., and Leylek, J., 1995, “A Systematic Computational Methodology Applied to a Jet-in-Crossflow—Part 2: Unstructured/Adaptive Grid Approach,” ASME Paper No. 95-WA/HT-52.
Hyams, D., McGovern, K., and Leylek, J., “Effects of Geometry on Slot-Jet Film Cooling Performance,” ASME Paper No. 96-GT-187.
Walters,  D., and Leylek,  J., 1997, “A Consistency Accurate Computational Methodology Applied to a Three-Dimensional Film Cooling Flowfield,” ASME J. Turbomach., 119, pp. 777–785.
Fluent-UNS Users Guide, May 1996, Release 4.0, Fluent Inc., Lebanon, NH.
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 Paper No. 97-GT-339.

Figures

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Demonstration of the terminology used for compound-angle injection film cooling
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Top view of a single pitch of a row of holes showing the four film cooling configurations studied
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Isometric view of the computational domain all looking forward showing the extent of the domain for Φ=60 deg
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Demonstration of the film-hole centerline plane for Φ=60 deg
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Velocity magnitude normalized by U showing jetting and separation regions demonstrating very good correspondence between (a) the streamwise Φ=0 deg and (b) the Φ=60 deg compound-angle cases
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Cp along the test surface showing increased pressure gradients between (a) Φ=0 deg and (b) Φ=90 deg at M=1.25
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v/U for the case of M=1.25 showing the effects of compound-angle injection on the coolant distribution at the exit for (a) Φ=0 deg, and (b) Φ=90 deg
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Discharge angles showing the jet trajectory as it exits the film hole for the case of Φ=90 deg, M=1.25
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Particle traces released from the crossflow boundary layer showing the complex flow around an isotherm Θ=0.2 for M=1.25 and Φ=60 deg
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Turbulence intensity on a plane y/D=0.2 showing turbulence quantities exiting the film-hole as well as those generated by the jet-crossflow interaction for M=1.25, Φ=60 deg
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Contours of θ at downstream locations showing a quick merger of coolant between holes for Φ=60 deg, M=1.25
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Velocity vectors in crossplanes showing the demise of the vortex as it is damped to a pure lateral shear layer for M=1.25, Φ=60 deg
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Contours of η on the downstream wall showing the characteristic regions for both computations (bottom) and experiments (top) for Φ=60 deg and M=1.25
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Lateral distribution of η at downstream locations showing good correspondence between experiments and computations for Φ=60 deg and M=1.25
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Laterally averaged η̄ versus downstream distance showing the effects of compound-angle injection Φ and blowing ratio
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Normalized heat transfer coefficient for M=1.25 and Φ=60 deg
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Lateral distributions of heat transfer coefficient show good agreement between computationally predicted and experimentally measured data
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Laterally averaged heat transfer coefficient results showing the effects of compound angle on the heat transfer characteristics

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