| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
This study expands the knowledge of spontaneous ignition of isolated fuel droplets to that of spray through the investigation of effects of droplet interaction. In the spontaneous ignition of most hydrocarbon fuels, two-stage ignition occurs, which is cool-flame appearance and subsequent hot-flame appearance. Two-stage ignition of a droplet pair was observed in microgravity using two interferometers, which enables three-dimensional observation. Cool flame appeared on the outer side of the droplet pair, and hot flame appeared on the inner side. In the spontaneous ignition of a droplet pair with different initial diameters, a smaller droplet promoted ignition normally, though it delayed in the limited conditions like near ignitable limit. Such tendencies were explained through local balance between species transport and chemical reactions.
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