円筒状に拡大する予混合火炎の不安定挙動に及ぼす放射の効果

概要

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The effects of radiation on the unstable behavior of cylindrically expanding premixed flames at low Lewis numbers were studied by two-dimensional unsteady calculations of reactive flows, based on the diffusive-thermal model equation. When the Lewis number was sufficiently low under the adiabatic conditions, cellular flame fronts formed, which was due to diffusive-thermal instability. As the radiation loss increased, the front behavior became more unstable. This indicated that the radiation loss promoted the unstable behavior of flame fronts at low Lewis numbers. At sufficiently large radiation loss, several small flames were observed, which was in qualitative agreement with the experimental results under the low gravity conditions. Small flames appeared on the grounds that large curvature of flame fronts was necessary to keep high temperature against the radiation loss.
2010-09-25