期刊
COMBUSTION AND FLAME
卷 204, 期 -, 页码 142-151出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.combustflame.2019.03.013
关键词
Flame stabilization; Supersonic flames; Fuel-rich hot coflow; Chemiluminescence and schlieren images
类别
资金
- National Natural Science Foundation of China [91541110, 51706185]
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. (C) 2019 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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