圧力によるプロパン予混合伝播火炎の乱流燃焼速度の変化についての乱流Reynolds数およびMarkstein数による検討(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 of laminar flame was employed to quantify the effects of the equivalence ratio and the pressure of the mixture on turbulent burning velocities. The ratios of the turbulent burning velocities to unstretched laminar ones, u_<tn>/u_l increased as the mixture pressure increased. Because the unstertched laminar burning velocities, u_l decreased with the mixture pressure, the relative turbulence intensities to the laminar burning velocities, u'/u_l increased with the increase in the mixture pressure. The turbulence Reynolds number also affected u_<tn>/u_l. u_<tn>/u_l increased with the increase in the turbulence Reynolds number due to the decrease in the kinematic viscosity with the pressure. And u_<tn>/u_l increased with the decrease in the Markstein number if u'/u_l or the turbulence Reynolds number was constant. Turbulent burning velocities were affected by the turbulence Reynolds number, the relative turbulence intensity and the Markstein number relating to the thermo-diffusive effects and flame instabilities.
社団法人日本機械学会の論文
2006-03-25