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Research Papers

Effect of High Freestream Turbulence on Flowfields of Shaped Film Cooling Holes

[+] Author and Article Information
Robert P. Schroeder

Department of Mechanical
and Nuclear Engineering,
The Pennsylvania State University,
University Park, PA 16802
e-mail: rschroeder@sargentlundy.com

Karen A. Thole

Department of Mechanical
and Nuclear Engineering,
The Pennsylvania State University,
University Park, PA 16802
e-mail: kthole@psu.edu

1Present address: Sargent and Lundy, Chicago, IL 60603.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received November 20, 2015; final manuscript received December 13, 2015; published online April 5, 2016. Editor: Kenneth C. Hall.

J. Turbomach 138(9), 091001 (Apr 05, 2016) (10 pages) Paper No: TURBO-15-1270; doi: 10.1115/1.4032736 History: Received November 20, 2015; Revised December 13, 2015

Shaped film cooling holes have become a standard geometry for protecting gas turbine components. Few studies, however, have reported flowfield measurements for moderately expanded shaped holes and even fewer have reported on the effects of high freestream turbulence intensity relevant to gas turbine airfoils. This study presents detailed flowfield and adiabatic effectiveness measurements for a shaped hole at freestream turbulence intensities of 0.5% and 13%. Test conditions included blowing ratios of 1.5 and 3 at a density ratio of 1.5. Measured flowfields revealed a counter-rotating vortex pair (CRVP) and high jet penetration into the mainstream at the blowing ratio of 3. Elevated freestream turbulence had a minimal effect on mean velocities and rather acted by increasing turbulence intensity around the coolant jet, resulting in increased lateral spreading of coolant.

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References

Kohli, A. , and Bogard, D. G. , 1998, “ Effects of Very High Freestream Turbulence on the Jet-Mainstream Interaction in a Film Cooling Flow,” ASME J. Turbomach., 120(3), pp. 785–790. [CrossRef]
Bons, J. P. , MacArthur, C. D. , and Rivir, R. B. , 1996, “ The Effect of High Free-Stream Turbulence on Film Cooling Effectiveness,” ASME J. Turbomach., 118(4), pp. 814–825. [CrossRef]
Schmidt, D. L. , and Bogard, D. G. , 1996, “ Effects of Free-Stream Turbulence and Surface Roughness on Film Cooling,” ASME Paper No. 96-GT-462.
Saumweber, C. , Schulz, A. , and Wittig, A. , 2003, “ Free-Stream Turbulence Effects on Film Cooling With Shaped Holes,” ASME J. Turbomach., 125(1), pp. 65–73. [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]
Haven, B. A. , Yamagata, D. K. , Kurosaka, M. , Yamawaki, S. , and Maya, T. , 1997, “ Anti-Kidney Pair of Vortices in Shaped Holes and Their Influence on Film Cooling Effectiveness,” ASME Paper No. 97-GT-45.
Thole, K. , Gritsch, M. , Schulz, A. , and Wittig, S. , 1998, “ Flowfield Measurements for Film Cooling Holes With Expanded Exits,” ASME J. Turbomach., 120(2), pp. 327–336. [CrossRef]
Laveau, B. , and Abhari, R. S. , 2010, “ Influence of Flow Structure on Shaped Hole Film Cooling Performance,” ASME Paper No. GT2010-23032.
Jessen, W. , Konopka, M. , and Schroeder, W. , 2012, “ Particle-Image Velocimetry Measurements of Film Cooling in an Adverse Pressure Gradient Flow,” ASME J. Turbomach., 134(2), p. 021025. [CrossRef]
Fawcett, R. J. , Wheeler, A. P. S. , He, L. , and Taylor, R. , 2012, “ Experimental Investigation Into Unsteady Effects on Film Cooling,” ASME J. Turbomach., 134(2), p. 021015. [CrossRef]
Wright, L. M. , McClain, S. T. , Brown, C. P. , and Harmon, W. V. , 2013, “ Assessment of a Double Hole Film Cooling Geometry Using S-PIV and PSP,” ASME Paper No. GT2013-94614.
auf dem Kampe, T. , Voülker, S. , Saümel, T. , Heneka, C. , Ladisch, H. , Schulz, A. , and Bauer, H.-J. , 2013, “ Experimental and Numerical Investigation of Flow Field and Downstream Surface Temperatures of Cylindrical and Diffuser Shaped Film Cooling Holes,” ASME J. Turbomach., 135(1), p. 011026. [CrossRef]
Eberly, M. K. , and Thole, K. A. , 2014, “ Time-Resolved Film Cooling Flows at High and Low Density Ratios,” ASME J. Turbomach., 136(6), p. 061003.
Schroeder, R. P. , and Thole, K. A. , 2014, “ Adiabatic Effectiveness Measurements for a Baseline Shaped Film Cooling Hole,” ASME Paper No. GT2014-25992.
Raffel, M. , Willert, C. E. , Wereley, S. T. , and Kompenhans, J. , 2007, Particle Image Velocimetry: A Practical Guide, 2nd ed., Springer, Berlin.
LaVision, 2014, “ Product Manual for DaVis 8.2.1.48998: FlowMaster,” LaVision GmbH, Göttingen, Germany, Item No. 1105011-4.
Eberly, M. K. , 2012, “ Time-Resolved Studies of High Density Ratio Film-Cooling Flows,” M.S. thesis, The Pennsylvania State University, University Park, PA.
Figliola, R. S. , and Beasley, D. E. , 2006, Theory and Design for Mechanical Measurements, Wiley, Hoboken, NJ.
Wieneke, B. , 2014, “ Generic A-Posteriori Uncertainty Quantification for PIV Vector Fields by Correlation Statistics,” 17th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, July 7–10, pp. 1–9.
Thole, K. A. , and Bogard, D. G. , 1995, “ Enhanced Heat Transfer and Shear Stress Due to High Free-Stream Turbulence,” ASME J. Turbomach., 117(3), pp. 418–424. [CrossRef]
Pietrzyk, J. R. , Bogard, D. G. , and Crawford, M. E. , 1990, “ Effects of Density Ratio on the Hydrodynamics of Film Cooling,” ASME J. Turbomach., 112(3), pp. 437–443. [CrossRef]
Bogard, D. G. , and Thole, K. A. , 1998, “ Wall-Bounded Turbulent Flows,” CRC Handbook of Fluid Dynamics, Section 13.5, CRC Press, Boca Raton, FL, pp. 13.49–13.63.

Figures

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Fig. 1

Schematic of the film cooling wind tunnel

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Fig. 2

Geometry of the shaped hole

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Fig. 3

Measurement setups for (a) PIV in the centerline plane and (b) stereo PIV in the x/D = 4 crossplane

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Fig. 4

Approach boundary layers measured at x/D = −2.3 for low, moderate, and high freestream turbulence intensities

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Fig. 5

Profiles of fluctuating streamwise velocity at x/D = −2.3 low, moderate, and high freestream turbulence intensities

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Fig. 6

Contours of time-mean streamwise velocity and streamlines in the centerline plane for DR = 1.5, Tu = 0.5% at (a) M = 1.5 and (b) M = 3

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Fig. 7

Contours of turbulence intensity and time-mean streamlines in the centerline plane for DR = 1.5, Tu = 0.5% at (a) M = 1.5 and (b) M = 3

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Fig. 8

Contours of u′v′¯ turbulent shear stress in the centerline plane for DR = 1.5, Tu = 0.5% at (a) M = 1.5 and (b) M = 3

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Fig. 9

Contours of mean streamwise velocity in the x/D = 4 crossplane for DR = 1.5, Tu = 0.5% at (a) M = 1.5 and (b) M = 3. In-plane mean velocity is shown by arrows.

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Fig. 10

Contours of turbulent shear stress in the x/D = 4 crossplane for DR = 1.5, Tu = 0.5% at (a) M = 1.5 and (b) M = 3. In-plane mean velocity is shown by gray arrows.

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Fig. 11

Contours of turbulence intensity in the x/D = 4 crossplane for DR = 1.5, Tu = 0.5% at (a) M = 1.5 and (b) M = 3. In-plane mean velocity is shown by white arrows.

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Fig. 12

Contours of adiabatic effectiveness for DR = 1.5, Tu = 0.5% at (a) M = 1.5 and (b) M = 3.0 [14]. Gray dashed lines illustrate position of the two flowfield measurement planes.

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Fig. 13

Contours of mean streamwise velocity in the x/D = 4 crossplane for DR = 1.5, Tu = 13.2% at (a) M = 1.5 and (b)M = 3. In-plane mean velocity is shown by arrows.

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Fig. 14

Contours of turbulent shear stress in the x/D = 4 crossplane for DR = 1.5, Tu = 13.2% at (a) M = 1.5 and (b) M = 3. In-plane mean velocity is shown by gray arrows.

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Fig. 15

Contours of turbulence intensity in the x/D = 4 crossplane for DR = 1.5, Tu = 13.2% at (a) M = 1.5 and (b) M = 3. In-plane mean velocity is shown by white arrows.

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Fig. 16

Profiles of mean streamwise velocity in the centerline plane at three streamwise positions, for both low and high freestream turbulence intensities

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Fig. 17

Profiles of velocity fluctuations in the centerline plane at three streamwise positions, for M = 1.5 at both low and high freestream turbulence intensities

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Fig. 18

Profiles of velocity fluctuations in the centerline plane at three streamwise positions, for M = 3.0 at both low and high freestream turbulence intensities. Legend is the same as in Fig.17.

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Fig. 19

Profiles of turbulent shear stress in the centerline plane at three streamwise positions, for both low and high freestream turbulence intensities. Legend is the same as in Fig. 16.

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Fig. 20

Contours of adiabatic effectiveness for DR = 1.5, Tu = 13.2% at (a) M = 1.5 and (b) M = 3.0. Dashed lines illustrate position of the two flowfield measurement planes.

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Fig. 21

Laterally averaged adiabatic effectiveness for DR = 1.5, M = 1.5 and 3, at three freestream turbulence intensities

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