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Research Papers: Forced Convection

Geometrical Optimization and Experimental Validation of a Tripod Film Cooling Hole With Asymmetric Side Holes

[+] Author and Article Information
Zhongran Chi

School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: chizr@sjtu.edu.cn

Jing Ren, Hongde Jiang

Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China

Shusheng Zang

School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received September 25, 2014; final manuscript received January 10, 2016; published online March 22, 2016. Assoc. Editor: Gongnan Xie.

J. Heat Transfer 138(6), 061701 (Mar 22, 2016) (12 pages) Paper No: HT-14-1639; doi: 10.1115/1.4032883 History: Received September 25, 2014; Revised January 10, 2016

A tripod cylindrical film hole with asymmetric side holes is studied numerically and experimentally on a flat plate for higher film cooling effectiveness. First, the influences of geometrical parameters are studied and the optimum configurations of the asymmetric tripod hole are found in a design of experiments (DoE) optimization study based on an improved numerical model for film cooling prediction, in which more than 100 3D computational fluid dynamics (CFD) simulations are carried out. Then, one optimum configuration of the asymmetric tripod hole is examined experimentally using pressure-sensitive paint (PSP) measurements and compared to the experimental results of the simple cylindrical film hole and a well-designed shaped film hole. The flow and heat transferring characteristics of the asymmetric tripod holes were explored from the DoE results. The side holes can form a shear vortex system or an antikidney vortex system when proper spanwise distances between them are adopted, which laterally transports the coolant and form a favorable coolant coverage. According to the experimental results on flat plate, the optimal configuration of the asymmetric tripod hole is significantly better than cylindrical hole, especially at high blowing ratios. Furthermore, it can provide equivalent or even higher film cooling effectiveness than a well-designed shaped hole.

Copyright © 2016 by ASME
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References

Eriksen, V. L. , and Goldstein, R. J. , 1974, “ Heat Transfer and Film Cooling Following Injection Through Inclined Circular Tubes,” ASME J. Heat Transfer, 96(2), pp. 239–245. [CrossRef]
Goldstein, R. J. , Eckert, E. R. G. , and Burggraf, F. , 1974, “ Effects of Hole Geometry and Density on Three-Dimensional Film Cooling,” Int. J. Heat Mass Transfer, 17(5), pp. 595–607. [CrossRef]
Walters, D. K. , and Leylek, J. H. , 2000, “ A Detailed Analysis of Film-Cooling Physics—Part I Streamwise Injection With Cylindrical Holes,” ASME J. Turbomach., 122(1), pp. 102–112. [CrossRef]
McGovern, K. T. , and Leylek, J. H. , 2000, “ A Detailed Analysis of Film Cooling Physics—Part II Compound-Angle Injection With Cylindrical Holes,” ASME J. Turbomach., 122(1), pp. 113–121. [CrossRef]
Hyams, D. G. , and Leylek, J. H. , 2000, “ A Detailed Analysis of Film Cooling Physics—Part III Streamwise Injection With Shaped Holes,” ASME J. Turbomach., 122(1), pp. 122–132. [CrossRef]
Ligrani, P. M. , Wigle, J. M. , Ciriello, S. , and Jackson, S. M. , 1994, “ Film-Cooling From Holes With Compound Angle Orientations: Part 1—Results Downstream of Two Staggered Rows of Holes With 3D Spanwise Spacing,” ASME J. Heat Transfer, 116(2), pp. 341–352. [CrossRef]
Bell, C. M. , Hamakawa, H. , and Ligrani, P. M. , 2000, “ Film Cooling From Shaped Holes,” ASME J. Heat Transfer, 122(2), pp. 224–232. [CrossRef]
Furukawa, T. , and Ligrani, P. M. , 2002, “ Transonic Film Cooling Effectiveness From Shaped Holes on a Simulated Turbine Airfoil,” J. Thermophys. Heat Transfer, 16(2), pp. 228–237.
Bunker, R. S. , 2010, “ Gas Turbine Film Cooling: Breaking the Limits of Diffusion Shaped Holes,” Heat Transfer Res., 41(6), pp. 627–650. [CrossRef]
Kusterer, K. , Bohn, D. , Sugimoto, T. , and Tanaka, R. , 2007, “ Double-Jet Ejection of Cooling Air for Improved Film Cooling,” ASME J. Turbomach., 129(4), pp. 809–815. [CrossRef]
Kusterer, K. , Elyas, A. , Bohn, D. , Sugimoto, T. , and Tanaka, R. , 2008, “ Double-Jet Film-Cooling for Highly Efficient Film-Cooling With Low Blowing Ratios,” ASME Paper No. GT2008-50073.
Kusterer, K. , Elyas, A. , Bohn, D. , Sugimoto, T. , Tanaka, R. , and Kazari, M. , 2009, “ A Parametric Study on the Influence of the Lateral Ejection Angle of Double-Jet Holes on the Film Cooling Effectiveness for High Blowing Ratios,” ASME Paper No. GT2009-59321.
Kusterer, K. , Elyas, A. , Bohn, D. , Sugimoto, T. , Tanaka, R. , and Kazari, M. , 2010, “ Film Cooling Effectiveness Comparison Between Shaped-and Double Jet Film Cooling Holes in a Row Arrangement,” ASME Paper No. GT2010-22604.
Ely, M. J. , and Jubran, B. A. , 2009, “ A Numerical Study on Improving Large Angle Film Cooling Performance Through the Use of Sister Holes,” Numer. Heat Transfer, Part A, 55(7), pp. 634–653. [CrossRef]
Khajehhasani, S. , and Jubran, B. A. , 2015, “ Numerical Assessment of the Film Cooling Through Novel Sister-Shaped Single-Hole Schemes,” Numer. Heat Transfer, Part A, 67(4), pp. 414–435. [CrossRef]
Heidmann, J. D. , 2008, “ A Numerical Study of Anti-Vortex Film Cooling Designs at High Blowing Ratio,” ASME Paper No. GT2008-50845.
Hunley, B. K. , Nix, A. C. , and Heidmann, J. D. , 2010, “ A Preliminary Numerical Study on the Effect of High Freestream Turbulence on Anti-Vortex Film Cooling Design at High Blowing Ratio,” ASME Paper No. GT2010-22077.
Dhungel, S. , Phillips, A. , Ekkad, S. V. , and Heidmann, J. D. , 2007, “ Experimental Investigation of a Novel Anti-Vortex Film Cooling Hole Design,” ASME Paper No. GT2007-27419.
Ramesh, S. , LeBlanc, C. N. , Ekkad, S. V. , and Alvin, M. A. , 2013, “ Tripod Hole Geometry Performance for a Vane Suction Surface Near Throat Location,” ASME Paper No. GT2013-94459.
Chi, Z. , Wang, S. , Ren, J. , and Jiang, H. , 2012, “ Multi Dimensional Platform for Cooling Design of Air-Cooled Turbine Blades,” ASME Paper No. GT2012-68675.
Li, X. , Ren, J. , and Jiang, H. , 2013, “ Algebraic Anisotropic Turbulence Modeling of Compound Angled Film Cooling Validated by PIV and PSP Measurements,” ASME Paper No. GT2013-94662.
Sinha, A. K. , Bogard, D. G. , and Crawford, M. E. , 1991, “ Film Cooling Effectiveness Down Stream of a Single Row of Holes With Variable Density Ratio,” ASME J. Turbomach., 133(3), pp. 442–449. [CrossRef]
Park, G. J. , 2007, Design of Experiments: Analytic Methods for Design Practice, Springer Science & Business Media, New York, pp. 309–391.
Morris, M. J. , Donovan, J. F. , Kegelman, J. T. , Schwab, S. D. , Levy, R. L. , and Crites, R. C. , 1993, “ Aerodynamic Applications of Pressure Sensitive Paint,” AIAA J., 31(3), pp. 419–425. [CrossRef]
Zhang, L. J. , and Jaiswal, R. S. , 2001, “ Turbine Nozzle Endwall Film Cooling Study Using Pressure-Sensitive Paint,” ASME J. Turbomach., 123(4), pp. 730–738. [CrossRef]
Russin, R. A. , Alfred, D. , and Wright, L. M. , 2009, “ Measurement of Detailed Heat Transfer Coefficient and Film Cooling Effectiveness Distributions Using PSP and TSP,” ASME Paper No. GT2009-59975.
Zhang, L. , and Moon, H. K. , 2004, “ Turbine Nozzle Endwall Inlet Film Cooling: The Effect of a Back-Facing Step and Velocity Ratio,” ASME Paper No. IMECE2004-59117.
Ahn, J. , Mhetras, S. , and Han, J. C. , 2005, “ Film-Cooling Effectiveness on a Gas Turbine Blade Tip Using Pressure-Sensitive Paint,” ASME J. Heat Transfer, 127(5), pp. 521–530. [CrossRef]
Li, J. , Ren, J. , and Jiang, H. , 2010, “ Film Cooling Performance of the Embedded Holes in Trenches With Compound Angles,” ASME Paper No. GT2010-22337.

Figures

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Fig. 1

Secondary flow structures on cross section (downstream): (a) kidney vortices pair and (b) antikidney vortices pair

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Fig. 2

Geometry of the asymmetric tripod film cooling holes: (a) top view and (b) isometric view. 1—entrance of the hole, 2—tripod branching, 3—exit of side hole #1, 4—exit of side hole #2, and 5—exit of middle hole.

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Fig. 3

Automatically generated mesh of one tripod film cooling hole: (a) overall view, (b) partial view near the film holes, and (c) sectional view at the hole exit

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Fig. 4

Experimental validation of film cooling effectiveness distribution predicted by ansys cfx [22]: (a) centerline and (b) spanwisely averaged

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Fig. 5

Area averaging of film cooling effectiveness distribution

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Fig. 10

Secondary flow structure of shear vortices on cross section (downstream)

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Fig. 9

Three-dimensional streamlines and streamwise vorticity contours at different streamwise locations: (a) case II: a1 = 1.5, a2 = 2.5, a3 = 0, and a4 = 0; (b) case V: a1 = 1.5, a2 = 2.5, a3 = 0, and a4 = 0.5; and (c) case VIII: a1 = 1.5, a2 = 2.5, a3 = 0, and a4 = 1.0

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Fig. 8

Three-dimensional streamlines and temperature contours at different streamwise locations: (a) case II: a1 = 1.5, a2 = 2.5, a3 = 0, and a4 = 0; (b) case V: a1 = 1.5, a2 = 2.5, a3 = 0, and a4 = 0.5; and (c) case VIII: a1 = 1.5, a2 = 2.5, a3 = 0, and a4 = 1.0

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Fig. 7

Predicted film cooling effectiveness distributions of nine cases: (a) I: a1 = 1.5, a2 = 2.0, a3 = −0.5, a4 = 0.5, and ηave = 0.289; (b) II: a1 = 1.5, a2 = 2.5, a3 = 0, a4 = 0, and ηave = 0.217; (c) III: a1 = 1.5, a2 = 3.0, a3 = 0, a4 = 0.5, and ηave = 0.330; (d) IV: a1 = 1.5, a2 = 2.0, a3 = 0, a4 = 0.5, and ηave = 0.286; (e) V: a1 = 1.5, a2 = 2.5, a3 = 0, a4 = 0.5, and ηave = 0.330; (f) VI: a1 = 1.0, a2 = 2.5, a3 = 0.5, a4 = 0.75, and ηave = 0.318; (g) VII: a1 = 1.5, a2 = 2.0, a3 = 0.5, a4 = 0.5, and ηave = 0.254; (h) VIII: a1 = 1.5, a2 = 2.5, a3 = 0, a4 = 1.0, and ηave = 0.309; and (i) IX: a1 = 2.0, a2 = 2.5, a3 = 0.5, a4 = 0.75, and ηave = 0.295

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Fig. 6

Effects of each design variable on the area average film cooling effectiveness

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Fig. 11

Schematic view of the test rig

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Fig. 13

Test section with LED lights

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Fig. 14

PSP calibration curves

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Fig. 15

Geometries of the tested film cooling holes: (a) cylindrical, (b) shaped, and (c) asymmetric tripod

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Fig. 16

Comparison of area average film cooling effectiveness measured by PSP

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Fig. 17

Distributions of η on the plate: (a) BR = 0.5, (b) BR = 1.0, (c) BR = 1.5, and (d) BR = 2.0

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Fig. 18

Spanwisely averaged distributions of η: (a) BR = 0.5, (b) BR = 1.0, (c) BR = 1.5, and (d) BR = 2.0

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