Structure of partially premixed n-heptane/air counterflow flames

An experimental-computational investigation of prevaporized n-heptane non-premixed and partially premixed flames established in a counterflow burner is presented. There is general agreement between various facets of the non-premixed flame measurements and the literature data. The partially premixed flames are characterized by a double flame structure. The peak partially premixed flame temperature increases with increasing premixing of the fuel stream. The peak CO2 and H2O concentrations are relatively insensitive to partial premixing. The CO and H2 peak concentrations on the premixed side increase as the fuel side equivalence ratio decreases. These species are transported to the non-premixed reaction zone where they oxidize. The C2 species have peaks in the premixed reaction zone.