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Research Papers: Gas Turbines: Turbomachinery

Heat Transfer Enhancement Due to Coolant Extraction on the Cold Side of Effusion Cooling Plates

[+] Author and Article Information
Riccardo Da Soghe

Ergon Research s.r.l.,
via Panciatichi 92,
Florence 50127, Italy
e-mail: riccardo.dasoghe@ergonresearch.it

Antonio Andreini

DIEF - Department of Industrial
Engineering Florence,
University of Florence,
via di Santa Marta 3,
Firenze 50139, Italy
e-mail: antonio.andreini@htc.de.unifi.it

Bruno Facchini

DIEF - Department of Industrial
Engineering Florence,
University of Florence,
via di Santa Marta 3,
Firenze 50139, Italy
e-mail: bruno.facchini@htc.de.unifi.it

Lorenzo Mazzei

DIEF - Department of Industrial
Engineering Florence,
University of Florence,
via di Santa Marta 3,
Firenze 50139, Italy
e-mail: lorenzo.mazzei@htc.de.unifi.it

1Corresponding author.

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received April 25, 2015; final manuscript received May 20, 2015; published online July 14, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(12), 122608 (Jul 14, 2015) (7 pages) Paper No: GTP-15-1145; doi: 10.1115/1.4030837 History: Received April 25, 2015

Effusion cooling represents one of the most innovative techniques to limit and control the metal temperature of combustors liner, and recently, attention has been paid by the scientific community on the characterization and the definition of design practices of such devices. Most of these studies were focused on the heat transfer on the hot side of effusion cooling plates, while just few contributions deal with the effusion plates cold side convective cooling. This paper reports a numerical survey aimed at the characterization of the convective cooling at the effusion plates cold side. Several effusion holes spacing is accounted for in conjunction with representative operating conditions. The study led to the development of an empirical correlation for the prediction of the cold side heat transfer coefficient enhancement factor, EF: it expresses the EF related to each extraction hole as a function of the pressure ratio β and the effusion plate porosity factor σ.

Copyright © 2015 by ASME
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References

Figures

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Fig. 1

Computational domain

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Fig. 3

Sketch of the planes used for the postprocessing

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Fig. 4

EF averaging locations: (left) lines for lateral-averaging and (right) surface for area-averaging

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Fig. 5

Lateral-averaged profiles of EF downstream of the hole: sensitivity to turbulence model (SR = 1.85, 4.70, and 7.68)

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Fig. 6

Lateral-averaged profiles of EF downstream of the hole: sensitivity to mesh refinement (SR = 4.70)

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Fig. 7

Area-averaged values of EF as a function of SR

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Fig. 8

Effect of pressure ratio on the EF parameter: σ = 1.16, Re = 550,000, and Tu = 32%

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Fig. 9

Eddy viscosity profile: σ = 1.16, Re = 550,000, and Tu = 32%

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Fig. 10

SR profile: σ = 1.16, Re = 550,000, and Tu = 32%

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Fig. 11

Effect of feeding channel Reynolds number: σ = 1.16, β = 1.005, and Tu = 32%

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Fig. 12

Effect of turbulence intensity: σ = 1.16, β = 1.05, and Re = 550,000

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Fig. 13

Effect of effusion plate porosity: Re = 550,000, β = 1.05, and Tu = 32%

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Fig. 14

Effect of effusion plate porosity, contour of EF: Re = 550,000, β = 1.05, and Tu = 32%

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Fig. 15

Velocity component normal to the effusion plate surface: Re = 550,000, β = 1.05, and Tu = 32%

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Fig. 16

Comparisons between the correlation predictions and the whole CFD data

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