Chemical effects of CO2 addition to oxidizer and fuel streams on flame structure in H2-O2 counterflow diffusion flames

Numerical simulation of CO2 addition effects to fuel and oxidizer streams on flame structure has been conducted with detailed chemistry in H2–O2 diffusion flames of a counterflow configuration. An artificial species, which displaces added CO2 in the fuel‐ and oxidizer‐sides and has the same thermoch...

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Bibliographic Details
Published in:International journal of energy research 2003-10, Vol.27 (13), p.1205-1220
Main Authors: Park, Jeong, Hwang, Dong-Jin, Choi, Jong-Geun, Lee, Kee-Man, Keel, Sang-In, Shim, Sung-Hoon
Format: Article
Language:English
Subjects:
Applied sciences
artificial species
chemical effect
Combustion of gaseous fuels
Combustion. Flame
Energy
Energy. Thermal use of fuels
Exact sciences and technology
fuel stream
oxidizer stream
radiation heat loss
Theoretical studies. Data and constants. Metering
thermal effect
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Summary:Numerical simulation of CO2 addition effects to fuel and oxidizer streams on flame structure has been conducted with detailed chemistry in H2–O2 diffusion flames of a counterflow configuration. An artificial species, which displaces added CO2 in the fuel‐ and oxidizer‐sides and has the same thermochemical, transport, and radiation properties to that of added CO2, is introduced to extract pure chemical effects in flame structure. Chemical effects due to thermal dissociation of added CO2 causes the reduction flame temperature in addition to some thermal effects. The reason why flame temperature due to chemical effects is larger in cases of CO2 addition to oxidizer stream is well explained though a defined characteristic strain rate. The produced CO is responsible for the reaction, CO2+H=CO+OH and takes its origin from chemical effects due to thermal dissociation. It is also found that the behavior of produced CO mole fraction is closely related to added CO2 mole fraction, maximum H mole fraction and its position, and maximum flame temperature and its position. Copyright © 2003 John Wiley & Sons, Ltd.
ISSN:0363-907X
1099-114X
DOI:10.1002/er.946