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TECHNICAL BRIEFS

Measured Film Cooling Effectiveness of Three Multihole Patterns

[+] Author and Article Information
Yuzhen Lin, Gaoen Liu

National Key Laboratory on Aero-Engines, Institute of Thermal Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100083, P.R. China

Bo Song1

National Key Laboratory on Aero-Engines, Institute of Thermal Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100083, P.R. China

Bin Li2

National Key Laboratory on Aero-Engines, Institute of Thermal Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100083, P.R. China

1

Currently with Gardner Denver, Inc.

2

Currently with China Gas Turbine Institute.

J. Heat Transfer 128(2), 192-197 (Aug 03, 2005) (6 pages) doi:10.1115/1.2137762 History: Received May 16, 2004; Revised August 03, 2005

As an advanced cooling scheme to meet increasingly stringent combustor cooling requirements, multihole film cooling has received considerable attention. Experimental data of this cooling scheme are limited in the open literature in terms of different hole patterns and blowing ratios. The heat-mass transfer analogy method was employed to measure adiabatic film cooling effectiveness of three multihole patterns. Three hole patterns differed in streamwise row spacing (S), spanwise hole pitch (P), and hole inclination angle (α), with the first pattern SP=2 and α=30°, the second SP=1 and α=30°, and the third SP=2 and α=150°. Measurements were performed at different blow ratios (M=14). Streamwise coolant injection offers high cooling protection for downstream rows. Reverse coolant injection provides superior cooling protection for initial rows. The effect of blowing ratio on cooling effectiveness is small for streamwise injection but significant for reversion injection.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Configuration of multihole film cooling

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Figure 2

Schematic of the experimental setup

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Figure 4

Comparison of the measured and correlated η of slot film cooling

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Figure 5

Measured η of the single hole and the single row

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Figure 6

Local η of Pattern SP2-30

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Figure 7

Local η of Pattern SP2-150

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Figure 8

Local η of Pattern SP1-30

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Figure 9

Averaged η of SP2-30 and SP2-150

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Figure 10

Averaged η of SP1-30 and SP2-30

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