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Russian Journal of Physical Chemistry B

, Volume 6, Issue 4, pp 517–522 | Cite as

Gas-phase spontaneous ignition of hydrocarbons

  • A. A. Borisov
  • N. M. Rubtsov
  • G. I. Skachkov
  • K. Ya. TroshinEmail author
Combustion, Explosion, and Shock Waves

Abstract

The ignition of hydrocarbons at low temperatures is experimentally studied in a rapid-mixture-injection static reactor. The ignition process was monitored using a high-speed color video camera. It was found that, at low temperatures, ignition starts in kernels, a feature also characteristic of methods for measuring the ignition delay time at high and medium temperatures (shock tube, rapid compression machine). Kernel-mode ignition is associated with gas-dynamic phenomena inherent in different techniques of heating the gas to the desired temperature. Ignition in the kernel is of chain-thermal nature. The emergence of a visible kernel can be considered the beginning of hot flame propagation. It is shown that, in the self-ignition mode, the propagation of the flame front from the initial kernel occurs by the induction mechanism, proposed by Ya.B. Zel’dovich, rather than by the diffusion-heat-conduction mechanism. Introduction of a platinum wire into the reactor produces a catalytic effect in the negative temperature coefficient region, while virtually unaffecting the ignition delay at lower temperatures.

Keywords

ignition hydrocarbon fuels kernel ignition high-speed filming negative temperature coefficient induction mechanism of flame propagation static setup catalytic surface convective heat transfer chain-thermal explosion ignition delay 

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Copyright information

© Pleiades Publishing, Ltd. 2012

Authors and Affiliations

  • A. A. Borisov
    • 1
  • N. M. Rubtsov
    • 2
  • G. I. Skachkov
    • 1
  • K. Ya. Troshin
    • 1
    Email author
  1. 1.Semenov Institute of Chemical PhysicsRussian Academy of SciencesMoscowRussia
  2. 2.Institute of Structural Macrokinetics and Problems of Materials ScienceRussian Academy of SciencesChernogolovla, Moscow oblastRussia

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