Ignition and Combustion of a Fine Fuel Droplet Falling Freely into the Hot Atmosphere
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概要
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To determine ignition lag, burning rate and drag coefficient for a fine fuel droplet, behavior of an array of tetralin droplets (120〜170 μφ in diameter) falling freely into the hot air (800〜1000℃) in an electric furnace was studied by high speed photography. The following results were obtained. (1) Ignition lag is decreased remarkably by raising the air temperature, but it is little affected by the droplet size. (2) In the droplet array, a droplet falling ahead promotes the ignition of a following one. This effect is varied with the distance between them. (3) For the burning rate of a single droplet, an empirical formula presented formerly by Sami and Ogasawara is modified so as to make it available over a wider range of Reynolds numbers, down to about 1. (4) In the range of our experiment, drag coefficient of a burning droplet is reduced to about 30% of that of a solid sphere.
- 一般社団法人日本機械学会の論文
著者
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Takagi Toshimi
Faculty Of Engineering Osaka University
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OGASAWARA Mitsunobu
Faculty of Engineering, Osaka University.
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FUJIMOTO Fumitaka
Mechanical Engineering Laboratory
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TOSA Yozo
Mitsubishi Heavy Industry
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Ogasawara Mitsunobu
Faculty Of Engineering Osaka University
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