噴流拡散火炎における渦と火炎との相互作用に基づく浮上がり現象

概要

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Lifting phenomena caused by vortex-flame interactions have been investigated about diluted-propane jet diffusion flames forced by a speaker installed at the bottom of a fuel tube. Open jet diffusion flames were formed on a co-flow burner composed of the inner fuel tube and an outer air tube. Two type nozzles of rim thickness of 1 mm and 0.2 mm were set at the end of the fuel tube for each experiment and the effects of the rim thickness on the flame stability were investigated. Artificial vortices were imposed in the fuel flow through the speaker excitation to make clear vortex-flame interactions. The schlieren and OH radical imaging techniques were employed to unveil the interactions. Experiments in terms of the difference of rim thickness revealed that the ratio of the rim thickness to the quenching distance is important for lifting criteria as proposed by Takahashi and Schmoll, because the ratio of unity determines the limitation of whether the end of the flame base being in or out the recirculation zone behind the rim. Moreover, it revealed that the vortex-flame interactions are able to become the trigger of lifting, though the effect to lifting was questionable so far.
一般社団法人日本機械学会の論文
2000-08-25