Abstract
An observation method for the reaction in turbulent premixed flames was proposed. A mixing layer between a combustible mixture and a hot burned gas, which existed in a uniform shear layer, was studied to observe the interaction between the turbulence and reaction. A typical wrinkled laminar flame appeared when the equivalence ratio of the mixture was 0.65, and for an equivalence ratio much lower than the flammability limit, a structure which looked like a distributed reaction zone was observed. In the latter, and intermediate reactedness and a thick reaction were observed by the detection of fluctuating temperature, ion current and chemiluminescent emission of the zone.
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