The radical index and the effect of oxygen concentration on non-premixed cool flame extinction of large n-alkanes

Zhou, Mengni; Yehia, Omar R.; Xu, Wenbin; Reuter, Christopher B.; Wang, Ziyu; Yan, Chao; Jiang, Bo; Ju, Yiguang

doi:10.1016/j.combustflame.2021.111471

The radical index and the effect of oxygen concentration on non-premixed cool flame extinction of large n-alkanes

Journal Article · Wed May 05 00:00:00 EDT 2021 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2021.111471· OSTI ID:1865795

^[1]; Yehia, Omar R. ^[2]; ^[2]; Reuter, Christopher B. ^[3]; ^[2]; Yan, Chao ^[2]; Jiang, Bo ^[2]; Ju, Yiguang ^[2]

Princeton Univ., NJ (United States); Wuhan Univ. of Technology, Hubei (China); Princeton University
Princeton Univ., NJ (United States)
Princeton Univ., NJ (United States); U.S. Air Force Research Lab., Wright-Patterson AFB, OH (United States)

The effects of fuel and oxygen concentrations on the extinction limits of non-premixed cool flames for large n-alkanes, ranging from n-heptane to n-dodecane, are measured in an atmospheric counterflow burner. The measurements are used (a) to derive a scaling law between the cool flame reactivity and the oxygen concentration and (b) to develop a radical index to rank the cool flame reactivity of n-alkanes, with the assistance of kinetic modeling. First, due to the significant role of multiple oxygen addition reactions in the low-temperature branching sequence, the relationship between cool flame extinction (and hence the chemical time scale) and oxygen concentration are examined. The results suggest that all measured n-alkane cool flame extinction limits exhibit similar nonlinear dependence on oxygen concentration. The results further show that, due to the combined effects of multi-oxygen addition processes and the negative temperature coefficient effect, the cool flame low temperature reactivity of n-alkanes is proportional to nth power of oxygen mole fraction, [O₂]ⁿ, with n = 1.5–2. Furthermore, by accounting for thermal and mass transport effects using a mass-weighted enthalpy, a cool flame radical index is proposed to evaluate the role of cool flame reactivity on the extinction limits of large n-alkanes. Here, we find that the radical index of large n-alkanes increases with the increase of carbon length of the fuel molecules, which is consistent with stronger low-temperature reactivity.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: NASA; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0021135

OSTI ID:: 1865795

Alternate ID(s):: OSTI ID: 1853719
OSTI ID: 1781953

Journal Information:: Combustion and Flame, Journal Name: Combustion and Flame Vol. 231; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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The radical index and the effect of oxygen concentration on non-premixed cool flame extinction of large n-alkanes

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