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    Chemical effects of hydrogen addition on soot formation in counterflow diffusion flames: Dependence on fuel type and oxidizer composition

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    Hydrogen_soot_Revised version R2_2.2_NoMarks.pdf
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    3.206Mb
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    PDF
    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Xu, Lei
    Yan, Fuwu
    Wang, Yu
    Chung, Suk Ho cc
    KAUST Department
    Combustion and Laser Diagnostics Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019-12-02
    Online Publication Date
    2019-12-02
    Print Publication Date
    2020-03
    Permanent link to this record
    http://hdl.handle.net/10754/660541
    
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    Abstract
    We experimentally studied and kinetically modeled the effects of hydrogen addition on soot formation in methane and ethylene counterflow diffusion flames (CDFs). To isolate the chemical effects of hydrogen in such flames, we also ran a set of experiments on flames of the same base fuels but with the addition of helium. Specifically, we measured the soot volume fractions of the flames using the planar laser-induced incandescence technique. We simulated detailed sooting structures by coupling the gas-phase chemistry with the polycyclic aromatic hydrocarbon (PAH)-based soot model, using a sectional method to resolve the soot particle dynamics. Our experimental and numerical results show that hydrogen chemically inhibits soot formation in ethylene CDFs. While in methane flames, it is interesting to observe that the difference in soot production between the hydrogen- and helium-doped cases became much smaller when the oxygen concentration in the oxidizer stream (XO) was reduced. This suggests that for methane CDFs the chemical soot-inhibiting effects of hydrogen was highly dependent on oxidizer composition (i.e., XO). Explanations are provided through detailed kinetic analysis concerning the effects of hydrogen addition on the growth of PAH, soot inception, and soot surface growth processes. Our results suggest that hydrogen's chemical role in soot formation not only depends on fuel type (ethylene or methane), it also may be sensitive to oxidizer composition.
    Citation
    Xu, L., Yan, F., Wang, Y., & Chung, S. H. (2020). Chemical effects of hydrogen addition on soot formation in counterflow diffusion flames: Dependence on fuel type and oxidizer composition. Combustion and Flame, 213, 14–25. doi:10.1016/j.combustflame.2019.11.011
    Sponsors
    This work was supported by the National Key R&D Program of China (2017YFC0211201), National Natural Science Foundation of China (51976142 and 51606136), the National Engineering Laboratory for Mobile Source Emission Control Technology (NELM2018A11) and Fundamental Research Funds for the Central Universities (WUT: 2017YB024). SHC was supported by King Abdullah University of Science and Technology.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2019.11.011
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0010218019305164
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2019.11.011
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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