| Budget Amount *help |
¥44,460,000 (Direct Cost: ¥34,200,000、Indirect Cost: ¥10,260,000)
Fiscal Year 2021: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2020: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2019: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2018: ¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
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| Outline of Final Research Achievements |
The downward flame propagation and its instability of C2H4/O2/CO2 premixed gas in a top open tube was investigated. It was found that combustion instability together with enhanced acoustic vibration were more likely to occur in longer tubes and smaller inner diameters. Assuming that the main amplification mechanism of combustion instability is velocity coupling, the theoretically predicted trend can well explain the experimental results. The pressure growth rate was also investigated by changing the flame area using the laser-heated flame surface curvature control method, and it was found that there is a proportional relationship between the flame area and the pressure growth rate. These results indicate that the main combustion instability mechanism in the system under study is velocity coupling. It was also found experimentally that the instability increases when NH3 is mixed with hydrocarbon fuel.
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