Flame Structure of Turbulent Premixed Flames in Opposed Jet Burner

Abstract

Effects of turbulent intensity on the flame structure in an opposed jet burner have been investigated for a methane/air mixture by conducting time-series temperature fluctuation, OH-LIPF, and double-probe ion current measurements. Combustion regime of the flames also has been discussed. With an increase of turbulent intensity under the condition of Karlovitz number larger than unity, the results show that the preheat zone thickness of local turbulent flamelet increases, while the reaction zone thickness keeps almost constant or gets thinner compared to that of laminar premixed flames. Flames of Karlovitz number larger than unity are more reasonable to be classified to the thin reaction zones regime rather than the distributed reaction zone regime.