Premium
Chemical effects of CO 2 addition to oxidizer and fuel streams on flame structure in H 2 –O 2 counterflow diffusion flames
Author(s) -
Park Jeong,
Hwang DongJin,
Choi JongGeun,
Lee KeeMan,
Keel SangIn,
Shim SungHoon
Publication year - 2003
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.946
Subject(s) - mole fraction , flame structure , chemistry , dissociation (chemistry) , adiabatic flame temperature , diffusion flame , thermodynamics , chemical reaction , thermal , diffusion , analytical chemistry (journal) , premixed flame , fraction (chemistry) , chemical engineering , combustion , organic chemistry , combustor , physics , engineering
Numerical simulation of CO 2 addition effects to fuel and oxidizer streams on flame structure has been conducted with detailed chemistry in H 2 –O 2 diffusion flames of a counterflow configuration. An artificial species, which displaces added CO 2 in the fuel‐ and oxidizer‐sides and has the same thermochemical, transport, and radiation properties to that of added CO 2 , is introduced to extract pure chemical effects in flame structure. Chemical effects due to thermal dissociation of added CO 2 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 CO 2 addition to oxidizer stream is well explained though a defined characteristic strain rate. The produced CO is responsible for the reaction, CO 2 +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 CO 2 mole fraction, maximum H mole fraction and its position, and maximum flame temperature and its position. Copyright © 2003 John Wiley & Sons, Ltd.