Burner Wake Stabilized Gas Jet Flames in Cross-Flow

An experimental study of the stability and structure of a propane gas jet flame in cross-flow at jet to cross-flow momentum flux ratio less than unity is presented. When this ratio is 0.17 the flame structure is characterized by three distinct zones (Type II flame). A planar recirculation vortex attached to the burner tube in its wake forms the first zone. A second axisymmetric flame follows the first zone downstream. The junction of the two zones is characterized by a third zone with an intense mixing of jet and cross-flow streams. When the jet to cross-flow momentum flux ratio is 0.02 the axisymmetric part of the flame is extinguished (Type I flame). Temperature and composition profiles at different regions of these flames indicate that much of the Type II flame is akin to a premixed flame and the Type I flame is diffusion controlled.