Effects of pressure on soot production in piloted turbulent non-premixed jet flames

Laser-induced incandescence (LII) was used to quantify the soot volume fraction in five piloted turbulent non-premixed C2H4-N2 jet flames at elevated pressures. In one series of flames, bulk velocity held constant as pressure increased from 1 bar (Re = 10,000) 3 30,000), and then 5 50,000). other series, a Reynolds number 10,000 bar, bar. LII measurements were calibrated with laminar diffusion each using 2D diffuse line-of-sight attenuation. Mean RMS fractions along flame centerline exhibit Gaussian profiles for all flames. The magnitude spatial distribution are enhanced by increases pressure. both peak mean scales p2.2. scaling drops p1.5 if volume-integrated on per fuel mass basis is considered instead. At threefold increase Re leads decrease despite intermittency. fivefold results intermittency near zero flame’s center slight fraction.