分光可視化画像処理による噴霧火炎の構造観察

概要

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Spray flames with or without gaseous fuel were observed by spectral visualization and Mie-scattering techniques in order to elucidate the "group combustion mechanism" of droplets. The instantaneous images of droplet clusters illuminated by a planar laser beam were taken successively in pairs or simultaneously with an instantaneous OH-chemiluminescence image or C_2-band luminescence one. It was found that, in the case of a small liquid-fuel fraction and a small average diameter of droplets, a gas-phase reaction occurred in a premixed combustion mode at and inside the periphery of droplet clusters; whereas, in the case of a large liquid-fuel fraction and a large average diameter of droplets, the gas-phase reaction took place at and outside the periphery of those clusters. In the latter case, dense droplet clusters of small size were left in the downstream of the flame front burning with intense solid emission from soot particles. These facts imply that a spray flame has a group structure; not a simple one, but a complicated one.
社団法人日本機械学会の論文
1992-02-25