TY - GEN
T1 - Experimental and kinetic studies of acetylene flames at elevated pressures
AU - Shen, Xiaobo
AU - Yang, Xueliang
AU - Santner, Jeffrey
AU - Ju, Yiguang
AU - Sun, Jinhua
N1 - Funding Information:
This work was supported by an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences with Grant No. DE-SC0001198 and DOE National Energy Technology Laboratory UTSR grant DE-FE0011822 . Xiaobo Shen and Jinhua Sun would like to thank the financial support from National Natural Science Foundation of China (No. 51376174 ) and National Basic Research Program of China (973 program, No. 2012CB719702 ).
PY - 2014
Y1 - 2014
N2 - The kinetic effects of CO2 and H2O dilution on the laminar flame speed of acetylene at elevated pressure has been investigated experimentally using outwardly propagating spherical flames from 1 - 20 atm. A high pressure kinetic model is assembled by including pressure dependent elementary reaction rates determined by recent theoretical calculations and experimental measurements. It is found that, unlike other hydrocarbons, the kinetic inhibition caused by CO2 dilution on acetylene flame speeds via CO2+H=CO+OH is reduced at both fuel rich and lean conditions due to the existence of direct CO2 formation pathways (HCCO+O2 and CH2+O2) in acetylene oxidation. On the other hand, the inhibiting kinetic effects of water dilution on acetylene flame speed are promoted because the shifting equilibrium of the HO2+O=OH+OH reaction inhibits production of O radicals needed for the O+C2H2=HCCO+H chain propagation reaction. Detailed analysis on the combustion chemistry of acetylene reveals that C2H2+O, HCCO+O2, HCO+O2, CH3+HO2, H+C2H3, CO+OH, CH2(S)+C2H2, and HCO decomposition are among the most important reactions for predicting the laminar flame speed, especially at high pressures. The results show that the new high pressure model (HP-Mech) improved prediction of flame speeds of acetylene with CO2 and H2O dilution.
AB - The kinetic effects of CO2 and H2O dilution on the laminar flame speed of acetylene at elevated pressure has been investigated experimentally using outwardly propagating spherical flames from 1 - 20 atm. A high pressure kinetic model is assembled by including pressure dependent elementary reaction rates determined by recent theoretical calculations and experimental measurements. It is found that, unlike other hydrocarbons, the kinetic inhibition caused by CO2 dilution on acetylene flame speeds via CO2+H=CO+OH is reduced at both fuel rich and lean conditions due to the existence of direct CO2 formation pathways (HCCO+O2 and CH2+O2) in acetylene oxidation. On the other hand, the inhibiting kinetic effects of water dilution on acetylene flame speed are promoted because the shifting equilibrium of the HO2+O=OH+OH reaction inhibits production of O radicals needed for the O+C2H2=HCCO+H chain propagation reaction. Detailed analysis on the combustion chemistry of acetylene reveals that C2H2+O, HCCO+O2, HCO+O2, CH3+HO2, H+C2H3, CO+OH, CH2(S)+C2H2, and HCO decomposition are among the most important reactions for predicting the laminar flame speed, especially at high pressures. The results show that the new high pressure model (HP-Mech) improved prediction of flame speeds of acetylene with CO2 and H2O dilution.
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M3 - Conference contribution
AN - SCOPUS:84902771955
SN - 9781624102561
T3 - 52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014
BT - 52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - 52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014
Y2 - 13 January 2014 through 17 January 2014
ER -