TY - JOUR
T1 - Ignition enhancement by addition of NO and NO2 from a N 2/O2 plasma torch in a supersonic flow
AU - Takita, Kenichi
AU - Abe, Naoyuki
AU - Masuya, Goro
AU - Ju, Yiguang
N1 - Funding Information:
This study was supported by the Sumitomo Foundation and the JFE 21st Century Foundation. The authors are grateful to Jun Ikeda, Sotaro Wada and Ryuta Ohashi for their help. Y. Ju appreciates the grant support from AFSOR.
PY - 2007
Y1 - 2007
N2 - The effects of NO and NO2 produced by using a plasma jet (PJ) of a N2/O2 mixture on ignition of hydrogen, methane, and ethylene in a supersonic airflow were experimentally and numerically investigated. Numerical analysis of ignition delay time showed that the addition of a small amount of NO or NO2 drastically reduced ignition delay times of hydrogen and hydrocarbon fuels at a relatively low initial temperature. In particular, NO and NO2 were more effective than O radicals for ignition of a CH4/air mixture at 1200 K or lower. These ignition enhancement effects were examined by including the low temperature chemistry. Ignition tests by a N2/O2 PJ in a supersonic flow (M= 1.7) for using hydrogen, methane, and ethylene injected downstream of the PJ were conducted. The results showed that the ignitability of the N2/O 2 PJ is affected by the composition of the feedstock and that pure O2 is not the optimum condition for downstream fuel injection. This result of ignition tests with downstream fuel injection demonstrated a significant difference in ignition characteristics of the PJ from the ignition tests with upstream fuel injection.
AB - The effects of NO and NO2 produced by using a plasma jet (PJ) of a N2/O2 mixture on ignition of hydrogen, methane, and ethylene in a supersonic airflow were experimentally and numerically investigated. Numerical analysis of ignition delay time showed that the addition of a small amount of NO or NO2 drastically reduced ignition delay times of hydrogen and hydrocarbon fuels at a relatively low initial temperature. In particular, NO and NO2 were more effective than O radicals for ignition of a CH4/air mixture at 1200 K or lower. These ignition enhancement effects were examined by including the low temperature chemistry. Ignition tests by a N2/O2 PJ in a supersonic flow (M= 1.7) for using hydrogen, methane, and ethylene injected downstream of the PJ were conducted. The results showed that the ignitability of the N2/O 2 PJ is affected by the composition of the feedstock and that pure O2 is not the optimum condition for downstream fuel injection. This result of ignition tests with downstream fuel injection demonstrated a significant difference in ignition characteristics of the PJ from the ignition tests with upstream fuel injection.
KW - Ignition
KW - Plasma torch
KW - Radical
KW - Scramjet
KW - Supersonic combustion
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U2 - 10.1016/j.proci.2006.07.108
DO - 10.1016/j.proci.2006.07.108
M3 - Conference article
AN - SCOPUS:34548800205
SN - 1540-7489
VL - 31 II
SP - 2489
EP - 2496
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
T2 - 31st International Symposium on Combustion
Y2 - 5 August 2006 through 11 August 2006
ER -