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TECHNICAL PAPERS

Experimental and Numerical Study of Impingement on an Airfoil Leading Edge With and Without Showerhead and Gill Film Holes

[+] Author and Article Information
M. E. Taslim, A. Khanicheh

Mechanical and Industrial Engineering Department, Northeastern University, 360 Huntington Avenue, Boston, MA 02115

J. Turbomach 128(2), 310-320 (Feb 01, 2005) (11 pages) doi:10.1115/1.2137742 History: Received October 01, 2004; Revised February 01, 2005

This experimental investigation deals with impingement on the leading edge of an airfoil with and without showerhead film holes and its effects on heat transfer coefficients on the airfoil nose area as well as the pressure and suction side areas. a comparison between the experimental and numerical results are also made. the tests were run for a range of flow conditions pertinent to common practice and at an elevated range of jet Reynolds numbers (8000–48,000). The major conclusions of this study were: (a) The presence of showerhead film holes along the leading edge enhances the internal impingement heat transfer coefficients significantly, and (b) while the numerical predictions of impingement heat transfer coefficients for the no-showerhead case were in good agreement with the measured values, the case with showerhead flow was under-predicted by as much as 30% indicating a need for a more elaborate turbulence modeling.

Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of the test apparatus

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Figure 2

Target surface and crossover jet geometries

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Figure 3

Inflow and outflow arrangements

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Figure 4

Typical mesh arrangement around the computational domain periphery

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Figure 5

Percentage of air flow rate through each crossover hole for some fow arrangements

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Figure 6

Nusselt number variation with Reynolds number for the nominal case of no showerhead flow

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Figure 7

Nusselt number variation with Reynolds number for the one-sided case of no showerhead flow

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Figure 8

Nusselt number variation with Reynolds number for the cross and circular flow cases of no showerhead flow

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Figure 9

Comparison between the heat transfer results of different outflow arrangements in no-showerhead cases

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Figure 10

Nusselt number variation with Reynolds number for the 100% showerhead flow case

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Figure 11

Nusselt number variation with Reynolds number for the combined case of showerhead and gill (symmetric) flows

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Figure 12

Nusselt number variation with Reynolds number for the combined case of showerhead and gill (one side) flows

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Figure 13

Nusselt number variation with Reynolds number for the combined case of showerhead and cross or circular flows

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Figure 14

Comparison between the experimental and numerical heat transfer results for the nominal case of no-showerhead flow

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Figure 15

Representative numerical heat transfer coefficient variation on the leading-edge wall

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Figure 16

Pressure ratios across the crossover holes and the leading-edge channel for different flow arrangements

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Figure 17

Representative numerical heat transfer coefficient variation on the side wall

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Figure 18

Comparison between the experimental and numerical heat transfer results for the 100% showerhead flow case

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