TY - JOUR
T1 - Characterization of hydrogen triple flame propagation in vitiated laminar coaxial flow
AU - Wu, Chih Yung
AU - Chen, Kun Ho
N1 - Funding Information:
This research was supported by the National Science Council of Republic of China under Grant Numbers NSC102-2221-E-244-006 . In addition, the financial assitance of Research Center for Energy Technology and Strategy, National Cheng Kung University under Grant Numbers D103-23008 is also acknowledged.
PY - 2014/9/3
Y1 - 2014/9/3
N2 - This paper numerically analyzes the propagation characteristics of a hydrogen flame in coaxial vitiated flow in a confined quartz tube. The transient propagation of the flame is calculated using Li's Mechanism of hydrogen oxidation, and the propagation characteristics are discussed based on these calculations. The formation of the reaction zone, the ignition of fuel, the transformation of the flame's base structure, and the propagation behavior of the hydrogen jet flame base are characterized in the present study. The flame characteristics is analyzed based on calculated results, the information provide several insight into the flame propagation and ignition layer at the leading edge in vitiated situations. The results show that the leading point of a hydrogen flame in coaxial fresh air propagates along the preferred equivalence ratio isoline as the flame has a triple flame structure. On the contrary, in vitiated coaxial flow, the propagation of the hydrogen flame fits triple flame theory more precisely. The flame's kinetic properties show that hydrogen flame propagation in coaxial vitiated flow is still dominated by the triple flame. The results also suggest that the transformation of the flame during propagation is affected by the pool of radicals as well as the chemical reactions.
AB - This paper numerically analyzes the propagation characteristics of a hydrogen flame in coaxial vitiated flow in a confined quartz tube. The transient propagation of the flame is calculated using Li's Mechanism of hydrogen oxidation, and the propagation characteristics are discussed based on these calculations. The formation of the reaction zone, the ignition of fuel, the transformation of the flame's base structure, and the propagation behavior of the hydrogen jet flame base are characterized in the present study. The flame characteristics is analyzed based on calculated results, the information provide several insight into the flame propagation and ignition layer at the leading edge in vitiated situations. The results show that the leading point of a hydrogen flame in coaxial fresh air propagates along the preferred equivalence ratio isoline as the flame has a triple flame structure. On the contrary, in vitiated coaxial flow, the propagation of the hydrogen flame fits triple flame theory more precisely. The flame's kinetic properties show that hydrogen flame propagation in coaxial vitiated flow is still dominated by the triple flame. The results also suggest that the transformation of the flame during propagation is affected by the pool of radicals as well as the chemical reactions.
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U2 - 10.1016/j.ijhydene.2014.06.155
DO - 10.1016/j.ijhydene.2014.06.155
M3 - Article
AN - SCOPUS:84906318145
SN - 0360-3199
VL - 39
SP - 14109
EP - 14119
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 26
ER -