プロパン予混合伝播火炎の層流および乱流燃焼速度に及ぼす圧力の影響(熱工学,内燃機関,動力など)

概要

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The effects of pressure on outwardly propagating laminar and turbulent flames were studied for propane-air mixtures at the equivalence ratios from 0.8 to 1.3 and the initial pressures from 0.10 to 0.50MPa. Turbulence intensity, u' was set to 0.80 and 1.59m/s. The Markstein number was employed to quanify the effects of the equivalence ratio and the pressure of the mixture on laminar and turbulent burning velocities. Turbulent burning velocities, u_<tn> did not become small with the increase in the mixture pressure although the unstertched laminar burning velocities, u_l decreased with the mixture pressure. The ratios of turbulent burning velocities to unstretched laminar ones, u_<tn>/u_l increased as the mixture pressure increased. They also increased with the increase in the equivalence ratio. We found that u_<tn>/u_l increased with the decrease in the Markstein number irrespective of the equivalence ratio, the initial mixture pressure and the turbulence intensity if u'/u_l did not vary so much. Turbulent burning velocities were affected not only by turbulence but also by the thermo-diffusive effects and flame instabilities both related to the Markstein number.
社団法人日本機械学会の論文
2005-08-25