TY - JOUR
T1 - Effects of controlled non-equilibrium excitation on H2/O2/He ignition using a hybrid repetitive nanosecond and DC discharge
AU - Mao, Xingqian
AU - Chen, Qi
AU - Rousso, Aric C.
AU - Chen, Timothy Y.
AU - Ju, Yiguang
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China [grant number 21676024 ], Beijing Natural Science Foundation [grant number 3182029 ], DOE-NETL research grant DE-FE0026825 and Exxon Mobil research grant. We appreciate the helpful discussion with Professor Feng Zhang at University of Science and Technology of China and Ms. Can Huang at Tsinghua University.
Publisher Copyright:
© 2019 The Combustion Institute
PY - 2019/8
Y1 - 2019/8
N2 - The present work reports on the effects of controlled non-equilibrium excitation of reactant molecules on low temperature H2/O2/He ignition by numerically modeling a hybrid repetitive nanosecond (NSD) and DC discharge at atmospheric pressure. At first, a detailed plasma-combustion kinetic model of H2/O2/He, including non-equilibrium excitation, is developed and validated by experimental data of a repetitively-pulsed nanosecond discharge. Then, the effects of ignition enhancement by NSD and a hybrid NSD/DC discharge, with controlled electron energy distribution for selective non-equilibrium excitation of vibrationally excited H2(v) and O2(v) as well as electronically excited O2(a1Δg) and O(1D), are compared. The results show that H2(v1) contributes significantly to the H production and OH consumption in the hybrid plasma discharge. Moreover, O2(a1Δg) and O2(v1−4) also contribute to the production O and OH. Uncertainty analysis of H2(v) and O2(a1Δg) elementary reactions on ignition delay time is conducted by using several different kinetic models. The comparison of ignition delay time using different plasma kinetic models indicates the selection of accurate rate constants involving excited species is important for plasma assisted ignition modeling. The results of hybrid discharge assisted H2/O2 ignition show that the optimized ignition enhancement is achieved when both excited species and radicals are produced efficiently at an appropriate DC electric field strength. The present modeling provides useful insight into the plasma-combustion model development and the development of controlled plasma discharge to achieve efficient ignition with optimized non-equilibrium excitation of reactants.
AB - The present work reports on the effects of controlled non-equilibrium excitation of reactant molecules on low temperature H2/O2/He ignition by numerically modeling a hybrid repetitive nanosecond (NSD) and DC discharge at atmospheric pressure. At first, a detailed plasma-combustion kinetic model of H2/O2/He, including non-equilibrium excitation, is developed and validated by experimental data of a repetitively-pulsed nanosecond discharge. Then, the effects of ignition enhancement by NSD and a hybrid NSD/DC discharge, with controlled electron energy distribution for selective non-equilibrium excitation of vibrationally excited H2(v) and O2(v) as well as electronically excited O2(a1Δg) and O(1D), are compared. The results show that H2(v1) contributes significantly to the H production and OH consumption in the hybrid plasma discharge. Moreover, O2(a1Δg) and O2(v1−4) also contribute to the production O and OH. Uncertainty analysis of H2(v) and O2(a1Δg) elementary reactions on ignition delay time is conducted by using several different kinetic models. The comparison of ignition delay time using different plasma kinetic models indicates the selection of accurate rate constants involving excited species is important for plasma assisted ignition modeling. The results of hybrid discharge assisted H2/O2 ignition show that the optimized ignition enhancement is achieved when both excited species and radicals are produced efficiently at an appropriate DC electric field strength. The present modeling provides useful insight into the plasma-combustion model development and the development of controlled plasma discharge to achieve efficient ignition with optimized non-equilibrium excitation of reactants.
KW - Controlled non-equilibrium excitation
KW - Hybrid nanosecond and DC discharge
KW - Ignition enhancement
KW - Kinetic modeling
KW - Uncertainty analysis
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U2 - 10.1016/j.combustflame.2019.05.027
DO - 10.1016/j.combustflame.2019.05.027
M3 - Article
AN - SCOPUS:85066975398
SN - 0010-2180
VL - 206
SP - 522
EP - 535
JO - Combustion and Flame
JF - Combustion and Flame
ER -