過濃予混合火炎におけるすす粒子の成長理論

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  • Theory on Growth of Soot Particles in Fuel-Rich Premixed Flame.
  • カノウヨ コンゴウ カエン ニ オケル スス リュウシ ノ セイチョウ リロン

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The soot formation process and the structure of a fuel-rich premixed flame using porous medium have been investigated by one-dimensional numerical analysis. The combustion reaction is represented by the Arrhenius law, while the reaction rate of soot formation is based on Tesner's model which has been modified to include the oxidation of soot. A novel model for soot formation is developed by taking coalescence and surface growth into account ; the coalescence probability is statistically evaluated for polydispersed soot particles. On the basis of this model, the following features of the soot formation process, especially those in the distribution of the soot particle size, are clarified. Immediately after the beginning of soot formation, surface growth is dominant. At the downstream, however, soot particles grow mainly by coalescence, but terminate if they collide with radicals. The flame structure is also discussed in terms of energy recirculation between the upstream porous medium and polydispersed soot particles.

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