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Research Papers: Combustion and Reactive Flows

Reacting Turbulent Flow and Thermal Field in a Channel With Inclined Bluff Body Flame Holders

[+] Author and Article Information
Cheng-Xian Lin1

Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN 37996

Richard Jack Holder

Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN 37996

1

Corresponding author.

J. Heat Transfer 132(9), 091203 (Jun 30, 2010) (11 pages) doi:10.1115/1.4001627 History: Received August 16, 2009; Revised February 02, 2010; Published June 30, 2010; Online June 30, 2010

In this paper, a numerical study has been carried out to investigate the effects of inlet turbulent intensity and angle of attack on the chemically reacting turbulent flow and thermal fields in a channel with an inclined bluff body V-gutter flame holder. With a basic geometry used in a previous experimental study, the inlet turbulent intensity was varied from 2% to 100%, while the angle of attack of the V-gutter was varied from 0 deg to 30 deg. The turbulent flow was modeled with a realizable k-ε two-equation turbulence model. The chemical reaction was premixed propane-air combustion with an equivalence ratio of 0.6. The chemistry-turbulence interaction was simulated with an eddy-dissipation model. Numerical results indicated that increasing the inlet turbulent intensity and V-gutter angle of attack resulted in an increase not only in the size, but also in the magnitude of the downstream high turbulence areas with shedding vortexes. The recirculation flow behind the flame holder tended to maintain the rear wall at constant temperature, except at the edges of the wall. The friction factor of the flow channel was more sensitive to the change in inlet turbulence intensity at smaller angle of attack of the V-gutter.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of a symmetric V-gutter in a horizontal flow channel

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Figure 2

Local turbulent intensity contours at different angle of attack and inlet turbulence intensity levels: (a) I=2%, α=0 deg; (b) I=100%, α=0 deg; (c) I=2%, α=20 deg; (d) I=100%, α=20 deg

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Figure 3

Velocity vector plots colored by axial velocity at angle of attack α=20 deg, I=100%

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Figure 4

Temperature contours at different angle of attack and inlet turbulence intensity levels: (a) I=2%, α=0 deg; (b) I=100%, α=0 deg; (c) I=2%, α=20 deg; (d) I=100%, α=20 deg

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Figure 5

CO2 mass fraction contours at different angle of attack and inlet turbulence intensity levels: (a) I=2%, α=0 deg; (b) I=100%, α=0 deg; (c) I=2%, α=20 deg; (d) I=100%, α=20 deg

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Figure 6

Maximum values of temperature, axial velocity, and turbulent intensity at different I

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Figure 7

Temperature profiles on the upper and lower channel walls at α=0 deg and α=30 deg: (a) upper wall and lower wall, α=0 deg; (b) upper wall, α=30 deg; (c) lower wall, α=30 deg

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Figure 8

Temperature profiles on the upper and lower V-gutter walls at α=0 deg and α=30 deg: (a) upper wall and lower wall, α=0 deg; (b) upper wall, α=30 deg; (c) lower wall, α=30 deg

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Figure 9

Temperature profile on the rear V-gutter wall: (a) α=0 deg; (b) α=30 deg

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Figure 10

Friction factor at different angle of attacks and inlet turbulence intensity

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