Experimental investigations on central vortex core in swirl spray flames using high-speed laser diagnostics

Centrally staged swirl combustion can effectively reduce NO x emission. However, the complex field is susceptible to producing large-scale coherent structures, such as precessing vortex core and central (CVC). This study mainly investigates effect of CVC on flow flame in a centrally spray combustor at elevated temperature pressure using 10 kHz high-speed CH * chemiluminescence (CL), 20 particle image velocimetry, 2 O planar laser-induced fluorescence (PLIF). For pilot flame, both CL PLIF are fork-shaped with three long parts, middle parts dynamics indicate structure. stratified structure exists an extended strip area strong vorticity near centerline combustor. The analysis proper orthogonal decomposition modes shows that motion swing, followed by precessing. Simultaneous diagnostics indicates entrainment leads transport from shear layer region In general, signal distributed two positive velocity regions, pilot/main jet around CVC. Taking advantage radical transportation potential method improve mixing combustor, distribution.