J0801-2-5 メソスケールの細管内におけるボルテックスバースティング機構による火炎伝播([J0801-2]エンジン,動力システムにおける燃焼技術(2))

概要

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A flame propagation in a small diameter tube has been experimentally investigated with use of a small diameter tube and a swirl injector for methane and propane/air mixtures Results show that, in a 3.6 mm tube, a flame can propagate rapidly along the tube axis due to vortex bursting. The propagation range in equivalence ratio is on the relatively fuel lean side, between 0.75 and 1.1 for methane, whereas on the very fuel rich side between 1.1 and 2.2 for propane. The Lewis number of a deficient species and the heat loss to the cold wall strongly affect the occurrence of vortex bursting in a small diameter tube. Further experiments have shown the flame speed is lowered down near the stoichiometric methane mixture, notwithstanding the large flame/core diameter ratio. This retardation of the flame speed seems to be resulted from an increase in the burned gas density due to cooling by the cold wall.
一般社団法人日本機械学会の論文
2010-09-04