An Experimental Investigation of the Characteristic of Radical ($OH^{\ast}$, $CH^{\ast}$, and $C_2^{\ast}$) and Pollutant Emission in Partially Premixed Swirling Methane-air Flames.

스월을 강화한 메탄/공기 부분 예혼합화염에서 자발광($OH^{\ast}$, $CH^{\ast}$, 그리고 $C_2^{\ast}$) 배출특성과 배기배출물에 관한 실험적 연구

An experimental study was performed to investigate the effects of partially premixing, varying the equivalence ratios from $1.36{\sim}{\infty}$, and swirlers with swirl numbers of 0, 0.28, 0.64, and 1.32, on the characteristic of radical ($OH^{\ast}$, $CH^{\ast}$, and $C_2^{\ast}$) and pollutant emission in partially premixed swirling flames. The signal from the electronically excited state of $OH^{\ast}$, $CH^{\ast}$, and $C_2^{\ast}$ was detected through a band pass filter with a photo multiplier tube, and flow fields images were detected through a schlieren system. The results demonstrated that the flame height decreases and jet spreading angle increase with increasing a swirl number. The more momentum ratio and swirl number increase, the more decrease flame height, and the generation of sooting flame is promoted.