Theoretical analysis of the evolution from ignition kernel to flame ball or planar flame

Zheng Chen, Yiguang Ju

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Dynamics of flame kernel evolution with and without external energy addition was investigated analytically and numerically. The effects of radiation heat loss, ignition power, and Lewis number on the correlation and transition between the initial flame kernel, the self-extinguishing flame, the flame ball, the outwardly propagating spherical flame, and the propagating planar flame were studied. The present study extended previous results by bridging the theories of the non-adiabatic stationary flame balls and traveling flames and allowing rigorous consideration of radiation heat losses. The results showed that the effects of radiation heat loss played an important role in flame regimes and flame transition and resulted in a new isolated self-extinguishing flame. Furthermore, it was found that radiation heat losses significantly increased the critical ignition radius and resulted in three different dependences of the minimum ignition power on the Lewis number. Comparisons between the numerical simulations and the analytical results showed a good agreement. The results suggested that prediction of flame initiation without appropriate consideration of radiation is not acceptable.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 44th AIAA Aerospace Sciences Meeting
Pages1953-1960
Number of pages8
StatePublished - Dec 1 2006
Event44th AIAA Aerospace Sciences Meeting 2006 - Reno, NV, United States
Duration: Jan 9 2006Jan 12 2006

Publication series

NameCollection of Technical Papers - 44th AIAA Aerospace Sciences Meeting
Volume3

Other

Other44th AIAA Aerospace Sciences Meeting 2006
CountryUnited States
CityReno, NV
Period1/9/061/12/06

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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  • Cite this

    Chen, Z., & Ju, Y. (2006). Theoretical analysis of the evolution from ignition kernel to flame ball or planar flame. In Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting (pp. 1953-1960). (Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting; Vol. 3).