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Accepted manuscript
Embargo End Date:
2022-12-29
Type
ArticleAuthors
Boyette, Wesley
Steinmetz, Scott A.
Guiberti, Thibault
Dunn, Matthew J.
Roberts, William L.

Masri, Assaad R.
KAUST Department
Clean Combustion Research CenterPhysical Science and Engineering (PSE) Division
Mechanical Engineering Program
KAUST Grant Number
BAS/1/1370-01-01Date
2020-12-29Embargo End Date
2022-12-29Submitted Date
2020-07-30Permanent link to this record
http://hdl.handle.net/10754/666850
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Show full item recordAbstract
This paper presents an experimental study of turbulent non-premixed jet flames of ethylene/nitrogen where the nitrogen is substituted with different proportions of hydrogen and/or ammonia. The focus is largely on the effects of hydrogen and ammonia on soot production in turbulent flames. A combination of pointwise, laser-induced fluorescence in the visible and UV bands (LIF-UV–visible), and laser-induced incandescence (LII) is used to measure soot precursors and soot along the flame centerline. All signals are collected at a repetition rate of 10 Hz with fast photomultiplier tubes to resolve the time decay. In a separate experiment, joint imaging of LIF-OH[sbnd]CH is also performed at a repetition rate of 10 kHz. Hydrogen substitution is found to increase the production of soot, whereas ammonia substitution inhibits soot formation. The peak mean soot volume fraction is almost a factor of 3 lower in the 25% ammonia case in comparison to the 25% nitrogen case. The mean signal decay time constant decreases with ammonia substitution, implying the formation of smaller soot nanoparticles. The mean signal decay time constant remains unaffected with hydrogen substitution. Measured peaks in LIF-CH and LIF-OH are reduced with ammonia substitution but only in regions upstream of where soot is formed. Further downstream in the sooting region, neither OH nor CH appear to be affected by the substitution of N2 with H2 or NH3.Citation
Boyette, W. R., Steinmetz, S. A., Guiberti, T. F., Dunn, M. J., Roberts, W. L., & Masri, A. R. (2021). Soot formation in turbulent flames of ethylene/hydrogen/ammonia. Combustion and Flame, 226, 315–324. doi:10.1016/j.combustflame.2020.12.019Sponsors
The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST) (Grant no. BAS/1/1370-01-01). Authors from the University of Sydney are supported by the Australian Research Council.Publisher
Elsevier BVJournal
Combustion and FlameAdditional Links
https://linkinghub.elsevier.com/retrieve/pii/S001021802030568Xae974a485f413a2113503eed53cd6c53
10.1016/j.combustflame.2020.12.019