| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Outline of Final Research Achievements |
In order to clarify and model the progressive dilution effect on ignition delay of non-premixed flame, we conducted numerical simulations for opposed laminar diffusion flames, and measured liftoff heights of turbulent lifted flames entraining diluent gases with high temperatures. The results obtained from the simulations reveal that dilution with high temperature gases shortens the ignition delay time whereas an excessive dilution delays the ignition. In addition, a time variation of dilution ratio of oxidizer significantly influences the ignition delay time. The experimental results demonstrate the increase in liftoff height with decreasing concentrations of reactant resulting from entrainments of diluent gas, and also the decrease in the height with elevating temperature of diluent gas. A model suggested in the present study successfully predicts the liftoff height variation associated with the diluent entrainments.
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