TY - JOUR
T1 - Revealing the competitive relationship between soot formation and chemiluminescence
AU - Li, Zhicong
AU - Lou, Chun
AU - Kumfer, Benjamin M.
N1 - Publisher Copyright:
© 2022
PY - 2022/11
Y1 - 2022/11
N2 - This paper reveals the competitive relationship between soot formation and chemiluminescence. Soot volume fraction (SVF) and chemiluminescence are measured in the experiment. A mechanism coupled with the soot model and OH*/CH*/C2*/CO2* reactions is constructed for kinetic analysis. By varying oxygen concentrations and CO2 additions, it is experimentally observed that chemiluminescence is inhibited in the soot-laden regions/flames rather than obscured by the soot radiation, implying that soot formation and chemiluminescence are in competition. Rate of production analysis shows that soot formation and chemiluminescence compete for fuel pyrolysis products (C2H3, C2H2, etc.) because their reaction paths are opposite. CH*, C2*, and OH* decrease with the increase of SVF because the pyrolysis products that can be used for chemiluminescence participate in soot formation. The rise in oxygen concentration also promotes the production of C4H4 from C2H. CO2 addition enhances the chemiluminescence by forming OH and CO to accelerate CH* and CO2* formation and consuming H to suppress the consumption of pyrolysis products in soot formation/inception.
AB - This paper reveals the competitive relationship between soot formation and chemiluminescence. Soot volume fraction (SVF) and chemiluminescence are measured in the experiment. A mechanism coupled with the soot model and OH*/CH*/C2*/CO2* reactions is constructed for kinetic analysis. By varying oxygen concentrations and CO2 additions, it is experimentally observed that chemiluminescence is inhibited in the soot-laden regions/flames rather than obscured by the soot radiation, implying that soot formation and chemiluminescence are in competition. Rate of production analysis shows that soot formation and chemiluminescence compete for fuel pyrolysis products (C2H3, C2H2, etc.) because their reaction paths are opposite. CH*, C2*, and OH* decrease with the increase of SVF because the pyrolysis products that can be used for chemiluminescence participate in soot formation. The rise in oxygen concentration also promotes the production of C4H4 from C2H. CO2 addition enhances the chemiluminescence by forming OH and CO to accelerate CH* and CO2* formation and consuming H to suppress the consumption of pyrolysis products in soot formation/inception.
KW - Chemiluminescence
KW - Inverse diffusion flame
KW - Kinetic analysis
KW - Soot formation
UR - https://www.scopus.com/pages/publications/85136473272
U2 - 10.1016/j.combustflame.2022.112335
DO - 10.1016/j.combustflame.2022.112335
M3 - Article
AN - SCOPUS:85136473272
SN - 0010-2180
VL - 245
JO - Combustion and Flame
JF - Combustion and Flame
M1 - 112335
ER -