TY - JOUR
T1 - Addition of NO2 to a laminar premixed ethylene-air flame
T2 - 31st International Symposium on Combustion
AU - Menon, Arvind V.
AU - Lee, Seong Young
AU - Linevsky, Milton J.
AU - Litzinger, Thomas A.
AU - Santoro, Robert J.
N1 - Funding Information:
The authors gratefully acknowledge funding from the Strategic Environmental Research and Development Program (SERDP) under Contract #F33615-98-D-2802. The authors are grateful to Mr. Matthew McKeand for obtaining the soot measurements. The authors also wish to thank Prof. Richard Yetter for the private discussions regarding the effect of NO 2 on the H 2 –O 2 system.
PY - 2007
Y1 - 2007
N2 - Experiments were conducted on a laminar premixed ethylene-air flame at equivalence ratios of 2.34 and 2.64. Comparisons were made between flames with 5% NO2 added by volume. Soot volume fraction was measured using light extinction and light scattering and fluorescence measurements were also obtained to provide added insight into the soot formation process. The flame temperature profiles in these flames were measured using a spectral line reversal technique in the non-sooting region, while two-color pyrometry was used in the sooting region. Chemical kinetics modeling using the PREMIX 1-D laminar flame code was used to understand the chemical role of the NO2 in the soot formation process. The modeling used kinetic mechanisms available in the literature. Experimental results indicated a reduction in the soot volume fraction in the flame with NO2 added and a delay in the onset of soot as a function of height above the burner. In addition, fluorescence signals-often argued to be an indicator of PAH-were observed to be lower near the burner surface for the flames with NO2 added as compared to the baseline flames. These trends were captured using a chemical kinetics model that was used to simulate the flame prior to soot inception. The reduction in soot is attributed to a decrease in the H-atom concentration induced by the reaction with NO2 and a subsequent reduction in acetylene in the pre-soot inception region.
AB - Experiments were conducted on a laminar premixed ethylene-air flame at equivalence ratios of 2.34 and 2.64. Comparisons were made between flames with 5% NO2 added by volume. Soot volume fraction was measured using light extinction and light scattering and fluorescence measurements were also obtained to provide added insight into the soot formation process. The flame temperature profiles in these flames were measured using a spectral line reversal technique in the non-sooting region, while two-color pyrometry was used in the sooting region. Chemical kinetics modeling using the PREMIX 1-D laminar flame code was used to understand the chemical role of the NO2 in the soot formation process. The modeling used kinetic mechanisms available in the literature. Experimental results indicated a reduction in the soot volume fraction in the flame with NO2 added and a delay in the onset of soot as a function of height above the burner. In addition, fluorescence signals-often argued to be an indicator of PAH-were observed to be lower near the burner surface for the flames with NO2 added as compared to the baseline flames. These trends were captured using a chemical kinetics model that was used to simulate the flame prior to soot inception. The reduction in soot is attributed to a decrease in the H-atom concentration induced by the reaction with NO2 and a subsequent reduction in acetylene in the pre-soot inception region.
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U2 - 10.1016/j.proci.2006.08.105
DO - 10.1016/j.proci.2006.08.105
M3 - Conference article
AN - SCOPUS:33947607140
SN - 1540-7489
VL - 31 I
SP - 593
EP - 601
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
IS - 1
Y2 - 5 August 2006 through 11 August 2006
ER -