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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Structures and stabilization of low calorific value gas turbulent partially premixed flames in a conical burner
Experimental Thermal and Fluid Science, Volume 34, No. 3, Year 2010
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Description
Experiments are carried out on partially premixed turbulent flames stabilized in a conical burner. The investigated gaseous fuels are methane, methane diluted with nitrogen, and mixtures of CH4, CO, CO2, H2 and N2, simulating typical products from gasification of biomass, and co-firing of gasification gas with methane. The fuel and air are partially premixed in concentric tubes. Flame stabilization behavior is investigated and significantly different stabilization characteristics are observed in flames with and without the cone. Planar laser induced fluorescence (LIF) imaging of a fuel-tracer species, acetone, and OH radicals is carried out to characterize the flame structures. Large eddy simulations of the conical flames are carried out to gain further understanding of the flame/flow interaction in the cone. The data show that the flames with the cone are more stable than those without the cone. Without the cone (i.e. jet burner) the critical jet velocities for blowoff and liftoff of biomass derived gases are higher than that for methane/nitrogen mixture with the same heating values, indicating the enhanced flame stabilization by hydrogen in the mixture. With the cone the stability of flames is not sensitive to the compositions of the fuels, owing to the different flame stabilization mechanism in the conical flames than that in the jet flames. From the PLIF images it is shown that in the conical burner, the flame is stabilized by the cone at nearly the same position for different fuels. From large eddy simulations, the flames are shown to be controlled by the recirculation flows inside cone, which depends on the cone angle, but less sensitive to the fuel compositions and flow speed. The flames tend to be hold in the recirculation zones even at very high flow speed. Flame blowoff occurs when significant local extinction in the main body of the flame appears at high turbulence intensities. © 2009 Elsevier Inc. All rights reserved.
Authors & Co-Authors
Yan, Beibei
China, Tianjin
Tianjin University
Sweden, Lund
Lunds Universitet
Li, B.
Sweden, Lund
Lunds Universitet
Baudoin, E.
Sweden, Lund
Lunds Universitet
Liu, C.
China, Tianjin
Tianjin University
Sweden, Lund
Lunds Universitet
Sun, Zhiwei
Sweden, Lund
Lunds Universitet
Li, Z. S.
Sweden, Lund
Lunds Universitet
Bai, X. S.
Sweden, Lund
Lunds Universitet
Aldén, M.
Sweden, Lund
Lunds Universitet
Chen, G.
China, Tianjin
Tianjin University
Mansour, Mohy S.
Egypt, Giza
Cairo University
Statistics
Citations: 35
Authors: 10
Affiliations: 3
Identifiers
Doi:
10.1016/j.expthermflusci.2009.10.011
ISSN:
08941777
Research Areas
Environmental