| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Outline of Final Research Achievements |
A stretched cylindrical diffusion flame was used in which the local structure of the turbulent diffusion flame was modeled. The flow unsteadiness was modeled by sinusoidal oscillation of the oxidizer flow velocity. In order to contribute to the advancement of exhaust gas recirculation technology of diesel engine, CO2 and N2 contained in exhaust gas were used as diluents for fuel and oxidizer. The following results were obtained. As the fluctuation frequency of the oxidizer flow rate increases, the fluctuation amplitude of the velocity gradient of the fuel stream increases, and the fluctuation amplitude of the mass flux of the fuel flowing into the flame increases. The fluctuation amplitude of the flame luminosity, which is related to the combustion reaction, also increases as the frequency increases. The flame curvature effect of the flame diluted with CO2 appears more remarkably than the flame diluted with N2, and the fluctuation amplitude of flame luminosity appears larger.
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