軽油-水エマルジョンの噴霧火災におけるミクロ爆発の観測 : 第2報,高速度撮影における時間的・空間的解像度の影響(熱工学,内燃機関,動力など)

概要

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Microexplosions of light oil-water emulsified fuel droplets were successfully documented using a high speed video camera with laser illumination. The temperature profile and the local frequency of explosion occurrence were estimated in open spray flames of water-in-oil type emulsion formed using an air-assist atomizer with a set of ring pilot burners. The estimates of the local frequency of the explosion occurrence were made in the upstream region of spray flames, since their temperature profiles indicated that the heat release was accelerated in the upstream region from the nozzle tip up to the height of 80 mm. Microexplosions were frequently observed in the upstream region where no microexplosion phenomenon was observed in the former study. In addition, all of those had very small spatial and temporal scales. It is probable that the principal factor having effects on the heat release of emulsion spray flame is not the microexplosions of larger droplets, as former theories predicted, but those of smaller ones. We, furthermore, observed the microexplosions of smaller droplets using an ultra high speed video camera, the frame rate of which was 10_6 frames/s. It was observed that the smaller droplets, whose diameter were less than 50 μm, exploded in the spray flame and their temporal and spatial scales were around 10 μs and 300 μm, respectively.
一般社団法人日本機械学会の論文
2003-06-25