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Research Papers

Film Cooling Performance of Sharp Edged Diffuser Holes With Lateral Inclination

[+] Author and Article Information
Christian Heneka, Achmed Schulz, Hans-Jörg Bauer

Institut für Thermische Strömungsmaschinen (ITS), Karlsruhe Institute of Technology (KIT), Kaiserstrasse 12, Karlsruhe 76131, Germany

Andreas Heselhaus, Michael E. Crawford

 SIEMENS Power Generation, Mülheim/Ruhr 45473, Germany

J. Turbomach 134(4), 041015 (Jul 21, 2011) (8 pages) doi:10.1115/1.4003726 History: Received November 09, 2010; Revised December 03, 2010; Published July 21, 2011; Online July 21, 2011

An experimental study on film cooling performance of laterally inclined diffuser shaped cooling holes is presented. The measurements have been conducted on a flat plate with coolant ejected from a plenum. The film cooling effectiveness downstream of a row of four laidback fanshaped holes with sharp edged diffusers has been determined by means of infrared (IR) thermography. A variety of geometric parameters has been tested, including the inclination angle, the compound angle, the area ratio, and the pitch to diameter ratio. All tests have been performed over a wide range of engine typical blowing ratios (M=0.53.0). The hot gas Reynolds number and the coolant to hot gas density ratio have been kept constant close to engine realistic conditions. The results, presented in terms of contour plots of related adiabatic film cooling effectiveness as well as laterally averaged related values, clearly show the influences of the cooling hole geometry. Increasing the area ratio and the compound angle, in general, leads to higher values of the effectiveness, whereas steeper injection causes a reduction of the effectiveness.

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Copyright © 2012 by American Society of Mechanical Engineers
Topics: Cooling , Coolants , Diffusers
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Figures

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Figure 2

Schematic view of test section

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Figure 3

Definition of geometrical parameters

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Figure 4

Comparison with literature data

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Figure 5

Contour plots of adiabatic film cooling effectiveness, effect of blowing ratio (E′=35 deg, F=90 deg, and AR=3.71)

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Figure 6

Laterally averaged adiabatic film cooling effectiveness, effect of blowing ratio (E′=35 deg, F=90 deg, and AR=3.71)

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Figure 7

Laterally averaged adiabatic film cooling effectiveness versus blowing ratio (E′=35 deg, F=90 deg, and AR=3.71)

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Figure 8

Laterally averaged adiabatic film cooling effectiveness, effect of inclination angle E′ (F=90 deg and AR=3.71)

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Figure 9

Laterally averaged adiabatic film cooling effectiveness, effect of compound angle F (E′=35 deg and AR=3.71)

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Figure 10

Contour plots of adiabatic film cooling effectiveness, effect of area ratio, E′=35 deg and F=90 deg (left: M=0.5 and right: M=2.0)

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Figure 11

Adiabatic film cooling effectiveness, effect of area ratio on lateral profiles, M=0.5

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Figure 13

Laterally averaged adiabatic film cooling effectiveness, effect of area ratio (E′=35 deg and F=90 deg)

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Figure 12

Adiabatic film cooling effectiveness, effect of area ratio on lateral profiles, M=2.0

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Figure 14

Laterally averaged adiabatic film cooling effectiveness, effect of hole pitch (E′=35 deg and F=90 deg)

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Figure 1

Layout of the test facility

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