TED-AJ03-223 OBSERVATION OF MICROEXPLOSIONS IN SPRAY FLAMES OF LIGHT OIL-WATER EMULSIONS

概要

論文の詳細を見る
Microexplosions of light oil-water emulsified fuel droplets were successfully documented using a high-speed video camera with laser illumination. The microexplosions were observed as the sudden appearance of luminous spots. It is supposed that the sudden appearance is due to the rapid increase of surface to volume ratio of the droplets caused by the microexplosions. The temperature profile and the local frequency of explosion occurrence were estimated for open spray flames of water-in-oil type emulsion formed using an air-assist atomizer with a set of ring pilot burners. The local frequency of the explosion occurrence were evaluated in the upstream region of spray flames, from the nozzle tip up to the height of 80mm, where their temperature profiles suggested that the heat release was accelerated, probably due to the droplet microexplosions. Microexplosions were frequently observed in the area above, where no microexplosion was observed in the former study with a rather slow high-speed video camera. All of those, however, had very small spatial scale and short temporal scale. It is probable that the principal factor having effects on the heat release in an emulsion spray flame is not the microexplosions of large 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/sec. The spatial and temporal scales of these microexplosions were estimated by measuring the maximum diameter and the high speed CCD frames. As a result, it was found that droplets whose diameters were less than 50μm exploded in the spray flame and the temporal and spatial scales of them were around 10μs and 300μm, respectively.[figure]
一般社団法人日本機械学会の論文

TED-AJ03-223 OBSERVATION OF MICROEXPLOSIONS IN SPRAY FLAMES OF LIGHT OIL-WATER EMULSIONS

スポンサーリンク

概要

著者

関連論文

スポンサーリンク