著者

三上 真人 大八木 大史 小嶋 直哉 菊池 政雄 若嶋 勇一郎 依田 真一

出版者

一般社団法人 日本燃焼学会

雑誌

日本燃焼学会誌 = Journal of the Combustion Society of Japan (ISSN:13471864)

巻号頁・発行日

vol.45, no.134, pp.238-247, 2003-11-30

参考文献数

30

被引用文献数

3

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<p>A new concept of the droplet array generation technique was proposed to realize a high quality and high reliability performance of microgravity experiments of multiple-droplet combustion. Each fuel droplet was formed on the intersection of the X-shape fine SiC fibers by supplying the liquid fuel through a fine glass tube. Several sets of the X-shape fibers and corresponding fine glass tubes were aligned at an interval to make a droplet array. All the droplets in array were simultaneously generated in a short time. In flame spread experiments, an end-droplet was ignited by a hot-wire igniter to initiate the flame spread along the array. Microgravity experiments of droplet array combustion were demonstrated with the new droplet array generation technique using a drop experiment facility MGLAB in Japan. In microgravity, large droplets, which were often failed to be generated in normal gravity, were successfully generated through this method. The present technique is also effective in droplet array combustion experiments using a high-volatility fuel, whose prevaporization is not negligible. The flame spread rate and the flame spread limit of linear droplet arrays were compared with existing experimental results. Effects of the suspending fiber on the flame spread were also discussed.</p>

著者

三上 真人 瀬尾 健彦 菊池 政雄 森上 修

出版者

山口大学

雑誌

基盤研究(B)

巻号頁・発行日

2012-04-01

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ジェットエンジン高空再着火時の燃料噴霧燃え広がりの理解を深めるために低圧における液滴列燃え広がりの微小重力実験行った.実験の結果,低圧での燃え広がり速度および燃え広がり限界はともに,大気圧の場合より大きくなることが明らかとなった.これらの圧力依存性について,燃え広がりに関わる素過程を考慮して考察を行った.高温領域の熱伝導速度は圧力に逆比例する.一方,高温領域の広がりの非定常性を考慮すると,その最大半径は圧力の-1/3乗に比例する.この圧力依存性を有する燃え広がり限界距離を考慮して,低圧におけるランダム分散液滴群の群燃焼発現特性を求めることができた.