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Technical Briefs

Experimental Blowout Limits and Computational Flow Field of Axial Single and Multijet Flames

[+] Author and Article Information
Khaled M. Shebl

Faculty of Engineering (Mattaria), Mechanical Power Engineering Department, Helwan University, Masaken Helmiat Al-zitoun, P.O. Box 11718, Cairo, Egypt

J. Eng. Gas Turbines Power 130(5), 054505 (Jul 01, 2008) (5 pages) doi:10.1115/1.2938276 History: Received October 29, 2006; Revised March 07, 2008; Published July 01, 2008

Measurements of the lean blowout equivalence ratio (Φoverall,b) along with the numerical simulations of flame structure and dynamics of the flow field for coaxial burner configurations are reported. The burner comprises central mixture (air+liquefied petroleum gas) issuing either through six holes distributed radially each of 2mm diameter or through a circular single port of area equal to the total areas of the six holes. A bluff-body stabilizer is attached to provide recirculation of the coaxial air surrounding the central flame. The study covers the effect of the central injection configuration with emphasis on the multijet on the overall lean equivalence ratio at which flame is extinguished. The dynamics of the flow field for the multiflame configurations were identified and compared with the single flame, using the generalized finite-rate chemistry model of FLUENT 6.2 with the detailed chemical reaction mechanism defined by GRI-MECH 3.0 and other mechanisms for the higher carbon species. The computed flow field of the multijet flame provides an extra intermediate vortex in addition to the two counter-rotating vortices observed for cases of the single central stream configuration. Such a vortex is believed to enhance the stability characteristics for all the test flames in the form of reduced experimental Φoverall,b-values.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 2

Two dimensional near stabilizer flow field for the single jet flame: (a). computed mean axial and radial velocity vectors (Ui=24m∕s, Uo,a=4.8m∕s) and (b) schematic of the proposed flow field

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Figure 3

Two dimensional contour plots of the computed static temperature (°K) for the single jet flame

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Figure 4

Two dimensional near stabilizer flow field for the multijet flames: (a) computed mean axial velocity vectors (Ui=24m∕s, Uo,a=4.8m∕s) and (b) schematic of the proposed flow field

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Figure 5

Two dimensional contour plots of the computed static temperature (°K) for the multijet flames

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Figure 6

Effect of inner mixture injection configurations on Φoverall,b at different inner bulk axial velocities

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