Total emission of soot and thermal radiation by free turbulent diffusion flames

摘要: Abstract The emission of soot and thermal radiation by free turbulent diffusion flames CO, H2, CH4, C2H6, C3H8, C2H4, C2H2 was studied over a range spanning the transition from forced convection to natural (burner diameters 0.7–10.9 mm, buoyancy Richardson ratios Ri L ≡ π g ϱ ∞ 3 4 G 0 2–10,000, where is flame length, source momentum flux, ϱ∞ ambient air density, acceleration due gravity. Both emission, expressed as ratio χS between output carbon input, radiant cooling, χR heat loss chemical energy input (heat combustion), rise with RiL tend plateaus becomes dominant > 2000). However, it also appears that they fundamentally depend on parameters other than RiL, being strongly correlated second Damkohler or loading factor analogous factors. behavior observed in reasonable accord theoretical expectations. plateau values at high are 0.18–0.4 for hydrocarbon fuels, 0.0015–0.0045 hydrocarbons acetylene. Acetylene emit up 100 times much others. Buoyancy unimportant below = 200 since then independent burner orientation (vertical horizontal). Also, fuels acetylene seems stablize, indicating χ S ⋍ 0.0003