TY - JOUR
T1 - Experimental and kinetic studies of acetylene flames at elevated pressures
AU - Shen, Xiaobo
AU - Yang, Xueliang
AU - Santner, Jeffrey
AU - Sun, Jinhua
AU - Ju, Yiguang
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 - 2015
Y1 - 2015
N2 - The kinetic effects of CO2 and H2O dilution on the laminar flame speed of acetylene at elevated pressures have been investigated experimentally using outwardly propagating spherical flames in a nearly constant pressure chamber from 1 to 20 atm. The flame speeds of C2H2/air mixtures at atmospheric pressure agree with recent measurements reasonably well. 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, which leads to a new kinetic model (HP Mech) that incorporates the recent understanding of elementary reactions. The effects of CO2 dilution on acetylene flame speeds are found to be small for both fuel rich and lean conditions due to the direct CO2 formation pathway (HCCO + O2) in acetylene oxidation. Water dilution effects are more pronounced, especially at lean conditions, because the radical pool composition is altered by shifting the equilibrium of H2O + O = OH + OH. Comparing to USC Mech II, HP Mech has much better performance compared to the current experimental measurements as well as the shock tube and flow reactor data.
AB - The kinetic effects of CO2 and H2O dilution on the laminar flame speed of acetylene at elevated pressures have been investigated experimentally using outwardly propagating spherical flames in a nearly constant pressure chamber from 1 to 20 atm. The flame speeds of C2H2/air mixtures at atmospheric pressure agree with recent measurements reasonably well. 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, which leads to a new kinetic model (HP Mech) that incorporates the recent understanding of elementary reactions. The effects of CO2 dilution on acetylene flame speeds are found to be small for both fuel rich and lean conditions due to the direct CO2 formation pathway (HCCO + O2) in acetylene oxidation. Water dilution effects are more pronounced, especially at lean conditions, because the radical pool composition is altered by shifting the equilibrium of H2O + O = OH + OH. Comparing to USC Mech II, HP Mech has much better performance compared to the current experimental measurements as well as the shock tube and flow reactor data.
KW - Acetylene
KW - CO and HO dilution effects
KW - Elevated pressure
KW - HP Mech
KW - Laminar flame speed
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U2 - 10.1016/j.proci.2014.05.106
DO - 10.1016/j.proci.2014.05.106
M3 - Article
AN - SCOPUS:84924896432
SN - 1540-7489
VL - 35
SP - 721
EP - 728
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
IS - 1
ER -