환형 화염이 있는 다중 에틸렌 확산화염의 PAH 및 매연분포

The distributions of PAH and soot particles were measured for multi-concentric ethylene diffusion flames with an annular flame inside and with an inverse diffusion flame attached at the center nozzle in addition to an annular flame. Temperatures of soot particles in flames were also measured by a modulated LⅡ technique. The presence of an annular flame inside increased the flame temperature at the soot formation region and resulted in the increase of PAH and soot concentrations. The maximum soot volume fraction, however, was decreased mostly due to the rapid oxidation of soot particles at the soot oxidation region. The addition of an inverse diffusion flame inside of an annular flame significantly decreased PAH and soot concentrations all over the flame. The oxidation of soot precursors including PAH as well as significantly increased flame temperature due to the flame-flame interaction could be the primary reason for the decreased soot volume fraction with annular and inverse diffusion flames inside.