Transient ignition of a combustible by stationary isothermal bodies

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Abstract

The transient ignition process of a stagnant combustible mixture by a stationary, isothermal flat plate or spherical particle is studied using matched asymptotic technique in the realistic limit of large activation energy. Results show that for a sufficiently-reactive mixture the flow field consists of a locally-similar reactive-diffusive region next to the hot surface and a non-similar transient-diffusive region external to it; that the ignition lag is usually much shorter than the characteristic diffusion time and hence can be considered to be instantaneous; and that the ignition process is only minimally affected by the geometry of the body. An explicit expression for the ignition delay has also been derived, enabling a priori assessment of its magnitude and its functional dependence on the various system parameters of interest.

Original languageEnglish (US)
Pages (from-to)237-242
Number of pages6
JournalCombustion science and technology
Volume19
Issue number5-6
DOIs
StatePublished - Apr 1 1979
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

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