<論文>噴流拡散火災の安定限界と挙動に関する研究

概要

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The flame stability limits essentially define the fundamental operation of the combustion system. The critical conditions at the stability limits are highly dependent on flow configurations and some species of fuels. For various species of fuels (methane and propane), the flame-base stability mechanism for flame holding has been studied. In this study, the transition behavior from the stable flame attached to nozzle rim to lifting and blow off is observed experimentally in unconfined, quiescent atmosphere and with co-flowing annular air. The lifting and blow-off criteria are proposed for the diffusion flame. Experiments were conducted to investigate the flame structure for various nozzle diameters from O.1 4 to 8.1mm. The results obtained are as follows. (1)The behaviors of the flames are classified into three regions for the methane and four regions for the propane. (2)The stability limits of the flames are influenced by the fuel jet and air velocities. (3)There exists a narrow region of the unburned premixed gas between the nozzle rim and the upstream end of the diffusion flame. (4)The upstream end of the diffusion flame is located at the airside near the nozzle rim.
神戸市立工業高等専門学校の論文
2002-03-01