Steinmetz, Scott A.
Dunn, Matthew J.
Roberts, William L.
Masri, Assaad R.
KAUST DepartmentClean Combustion Research Center
Physical Science and Engineering (PSE) Division
Mechanical Engineering Program
KAUST Grant NumberBAS/1/1370-01-01
Embargo End Date2022-12-29
Permanent link to this recordhttp://hdl.handle.net/10754/666850
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AbstractThis 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.
CitationBoyette, 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.2020.12.019
SponsorsThe 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.
JournalCombustion and Flame