Low Strain Rate Flame Extinction Characteristic of Oxygen Enhanced Opposed Flow Partially Premixed Flame in a Mesoscale Channel

채널 내부 대항류 산소부화 부분예혼합 화염의 저신장율 소화특성

The opposed flow flame in a mesoscale channel was constructed to observe the flame stabilization behaviors at low strain rate conditions (<$10s^{-1}$). The purpose of this study is to get the overall flame behaviors of partially premixed flames with oxygen enhanced conditions at low strain rates. The oxygen ratio in oxidizer was changed from 18 to 30 %. Conclusively, the flame extinction limit approached to about $1s^{-1}$, and divided into three representative regimes corresponding to self propagating flame, transitional flame, quenching flame regimes.