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Study on flame structure and extinction mechanism of dimethyl ether spherical diffusion flames

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  • Kang, Yinhu
  • Wang, Qiang
  • Zhang, Pengyuan
  • Liu, Congcong
  • Lu, Xiaofeng
  • Wang, Quanhai

Abstract

Flame extinction which belongs to one of the most important limit combustion phenomena plays a vital role in the combustion safety, efficiency, and stability, and additionally, it is also important for fire safety research. Hence studies on the flame extinction mechanism is of fundamental and practical significances in the combustion science. In this paper, the structure dynamics and extinction mechanism of dimethyl ether (DME) hot and cool spherical diffusion flames are studied by experiments and simulations using detailed chemistry and transport models. It was found that DME cool flame had an extended flammability limit in terms of the ambient oxygen mole fraction (XO2* = 7.9%) than the hot flame (XO2* = 23.2%). DME hot flame was much more sensitive than the cool flame with respect to the variation in XO2*. Explosive chemical mode with complex eigenvalues with positive real part was observed within the near-extinction region, either for hot or cool flame. Additionally, oscillation-induced extinction was also observed in this region, which would make the practical flame extinction point (XO2* = 24.04%) deviated from the steady-state extinction turning point of the S-curve (XO2* = 23.2%). The hot-flame extinction was mainly governed by high-temperature reactions involving small molecules, while the cool flame mainly by low-temperature reactions involving large hydrocarbons.

Suggested Citation

  • Kang, Yinhu & Wang, Qiang & Zhang, Pengyuan & Liu, Congcong & Lu, Xiaofeng & Wang, Quanhai, 2020. "Study on flame structure and extinction mechanism of dimethyl ether spherical diffusion flames," Energy, Elsevier, vol. 193(C).
    • Handle: RePEc:eee:energy:v:193:y:2020:i:c:s0360544219324818
    DOI: 10.1016/j.energy.2019.116786
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