Abstract
Simultaneous two-dimensional CH 4 and CH imaging data are obtained and analyzed in the near field of nonpremixed jet and bluff-body stabilized flames. CH is used as an indicator of the reaction zone. Both flames are found to have similar CH/CH 4 structures located in the vicinity of the 0.1 CH 4 concentration contour. In both cases, the flame zone consists of a narrow envelope that follows the fuel structure movements. Large-scale fuel structure protrusions are shown to produce gaps in the reaction zone. The data, combined with mixing time estimates for eddies smaller than the experimental resolution, support the concept that the fuel and air are premixed at the flame initiation point. Fuel concentrations in the reaction zone are substantial and range approximately within the flammability limits of the fuel at ambient temperature. The data are consistent with a dissipative eddy model, where reaction is limited to small isolated premixed structures within the flow, reaction occurs over a region several times thicker than the laminar flame thickness and the reaction is bounded by a fuel concentration range similar to the flammability range of the fuel.
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