F217 エタノール予混合火炎の層流および乱流燃焼速度に及ぼす圧力の影響(OS3 バイオマス・新燃料・環境技術)

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Spherically propagating laminar and turbulent flames at elevated pressures in a large volume bomb were studied for ethanol-air mixtures. Experiments were carried out at the equivalence ratio 0.8, 1.0 and 1.4 varying the initial pressure from 0.10 to 0.50MPa. Turbulence intensity of the mixture was 0.80 and 1.59m/s. The unstretched laminar burning velocity, U_l decreased as the initial pressure increased. The ratio of the turbulent burning velocity to U_l increased with increasing the ratio of turbulence intensity to U_l and turbulence Karlovitz number. This burning velocity ratio was large for rich flames. Thermo-diffusive effects might be more influential to rich ethanol flames because of the small Lewis number. This burning velocity ratio was also found to increase with increasing initial pressure.
2009-06-28