TY - JOUR
T1 - Flame stabilization of supersonic ethylene jet in fuel-rich hot coflow
AU - Liu, Bing
AU - He, Guoqiang
AU - Qin, Fei
AU - Lei, Qingchun
AU - An, Jian
AU - Huang, Zhiwei
N1 - Publisher Copyright:
© 2019 The Combustion Institute
PY - 2019/6
Y1 - 2019/6
N2 - The stability limit of a supersonic ethylene jet flame in a fuel-rich hot coflow was examined by investigating the influence of the injection pressure, which was varied from 2.0 atm to 4.5 atm, and of the equivalence ratio of the coflow, which was varied from 1.2 to 1.6. The flames were investigated with time-resolved chemiluminescence and schlieren images, as well as a large-eddy simulation of combustion. The results show that, with increasing injection pressure, the flame state changes from stable to unstable and blow-off, and the flame brush thickness, heat release, and height of coflow decrease. The flame stability limits decrease as the equivalence ratio of coflow increases. Lastly, a large-eddy simulation was performed to investigate the mechanism of flame stabilization, and the numerical simulation results are in good agreement with the experimental results. It was found that the stability of a supersonic flame is affected by the chemical time scale and flow time scale.
AB - The stability limit of a supersonic ethylene jet flame in a fuel-rich hot coflow was examined by investigating the influence of the injection pressure, which was varied from 2.0 atm to 4.5 atm, and of the equivalence ratio of the coflow, which was varied from 1.2 to 1.6. The flames were investigated with time-resolved chemiluminescence and schlieren images, as well as a large-eddy simulation of combustion. The results show that, with increasing injection pressure, the flame state changes from stable to unstable and blow-off, and the flame brush thickness, heat release, and height of coflow decrease. The flame stability limits decrease as the equivalence ratio of coflow increases. Lastly, a large-eddy simulation was performed to investigate the mechanism of flame stabilization, and the numerical simulation results are in good agreement with the experimental results. It was found that the stability of a supersonic flame is affected by the chemical time scale and flow time scale.
KW - Chemiluminescence and schlieren images
KW - Flame stabilization
KW - Fuel-rich hot coflow
KW - Supersonic flames
UR - http://www.scopus.com/inward/record.url?scp=85062937651&partnerID=8YFLogxK
U2 - 10.1016/j.combustflame.2019.03.013
DO - 10.1016/j.combustflame.2019.03.013
M3 - 文章
AN - SCOPUS:85062937651
SN - 0010-2180
VL - 204
SP - 142
EP - 151
JO - Combustion and Flame
JF - Combustion and Flame
ER -