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Research Papers

Experimental and Numerical Investigation of Flow Field and Downstream Surface Temperatures of Cylindrical and Diffuser Shaped Film Cooling Holes1

[+] Author and Article Information
Tilman auf dem Kampe

e-mail: tilman.aufdemkampe@siemens.com

Torsten Sämel

Siemens AG, Energy Sector
Fossil Power Generation Division
45473 Mülheim a. d. Ruhr, Germany

Hans-Jörg Bauer

Institut für Thermische Strömungsmaschinen,
Karlsruhe Institute of Technology,
76131 Karlsruhe, Germany

The content of this paper is copyrighted by Siemens Energy, Inc., and is licensed to ASME for publication and distribution only. Any inquiries regarding permission to use the content of this paper, in whole or in part, for any purpose must be addressed to Siemens Energy, Inc. directly.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 26, 2011; final manuscript received August 2, 2011; published online October 30, 2012. Editor: David Wisler.

J. Turbomach 135(1), 011026 (Oct 30, 2012) (10 pages) Paper No: TURBO-11-1161; doi: 10.1115/1.4006336 History: Received July 26, 2011; Revised August 02, 2011

An experimental and numerical study of the flow field and the downstream film cooling performance of cylindrical and diffuser shaped cooling holes is presented. The measurements were conducted on a flat plate with a single cooling hole with coolant ejected from a plenum. The flow field was investigated by means of 3D-PIV as well as 3D-LDV measurements, the downstream film cooling effectiveness by means of infrared thermography. Cylindrical and diffuser holes without lateral inclination have been examined, varying blowing ratio and density ratio as well as freestream turbulence levels. 3D-CFD simulations have been performed and validated along with the experimental efforts. The results, presented in terms of contour plots of the three normalized velocity components as well as adiabatic film cooling effectiveness, clearly show the flow structure of the film cooling jets and the differences brought about by the variation of hole geometry and flow parameters. The quantitative agreement between experiment and CFD was reasonable, with better agreement for cylindrical holes than for diffuser holes.

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Figures

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Fig. 1

Schematic view of test section

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Fig. 2

Film cooling hole geometries

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Fig. 3

Computational domain and boundary conditions

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Fig. 4

Experimental (top) and computational (bottom) distributions of streamwise (left), wall normal (center), and lateral (right) velocity components at x/d = 1 for cylindrical hole coolant ejection at α = 35 deg, M = 1.0, DR = 1.4, Tu = 7%

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Fig. 5

Experimental (top) and computational (bottom) distributions of streamwise (left), wall normal (center), and lateral (right) velocity components at z/d = 0.5 for cylindrical hole coolant ejection at α = 35 deg, M = 1.0, DR = 1.4, Tu = 7%

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Fig. 6

PIV, LDV, CFD velocity and turbulence intensity profiles for cylindrical hole coolant ejection at α = 35 deg, M = 1.0, DR = 1.4, Tu = 7%. (a) Streamwise velocity, (b) wall normal velocity, (c) lateral velocity, (d) turbulence intensity.

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Fig. 7

Experimental (top) and computational (bottom) distributions of streamwise (left), wall normal (center), and lateral (right) velocity components at z/d = 0.5 for diffuser hole coolant ejection at α = 35 deg, M = 1.0, DR = 1.4, Tu = 7%

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Fig. 8

PIV, LDV, CFD velocity and turbulence intensity profiles for diffuser hole coolant ejection at α = 35 deg, M =1.0, DR = 1.4, Tu = 7%. (a) Streamwise velocity, (b) wall normal velocity, (c) lateral velocity, (d) turbulence intensity.

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Fig. 9

Experimental (top) and computational (bottom) distributions of streamwise (left), wall normal (center), and lateral (right) velocity components at z/d = 0.5 for diffuser hole coolant ejection at α = 35 deg, M = 2.0, DR = 1.1, Tu = 7%

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Fig. 10

PIV, LDV, CFD velocity profiles for diffuser hole coolant ejection at α = 35 deg, M = 2.0, DR = 1.1, Tu = 7%. (a) Streamwise velocity, (b) wall normal velocity.

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Fig. 11

CFD streamlines in diffuser hole at y/d = 0, M = 2.0

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Fig. 12

Laterally averaged cooling effectiveness for cylindrical and diffuser hole at M = 1.0

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