Sooting Limit of a Double Diffusion Flame

Michio Kitano, Hideaki Kobayashi, Nobuhiko Nishiki

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Inside a coaxial flow diffusion flame of the ordinary type (fuel ejection into an air atmosphere), another diffusion flame of the reverse type (air ejection into a fuel atmosphere) was formed. The sooting limits of this double diffusion flame were measured for propane with three different types of burners, and the effects of several factors, such as the amount of inner air, flame-to-flame distance, thermal condition between the two flames, and flow stretch, were investigated. On the basis of the results, the effectiveness of making use of the double flame in the suppression of soot emission from diffusion flames of the coaxial flow type was discussed. The main findings were: (1) The double flame condition suppressed soot emission more effectively. (2) The sooting limit was controlled by the outer flame temperature, and therefore, adjusting the factors so as to increase this temperature may lead to much stronger soot suppression.

Original languageEnglish
Pages (from-to)1979-1984
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number515
Publication statusPublished - 1989


  • Diffusion Combustion
  • Double Diffusion Flame
  • Flame
  • Flame Temperature
  • Pollutant
  • Sooting Limit
  • Stretch


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