The Effect of Mixing Intensity and Degree of Premix on Soot Formation in a Backmixed Combustor

To date there is no universal agreement as to the interaction between fuel type, fuel-air mixture preparation combustion chamber flow characteristics and their effect on soot formation. A propane fueled modified conical backmixed steady flow reactor was built in which the fuel and air could be mixed...

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Bibliographic Details
Published in:SAE transactions 1983-01, Vol.92, p.858-871
Main Authors: Hoag, Kevin L., Foster, David E.
Format: Article
Language:English
Subjects:
Combustion
Combustion chambers
Diffusion flames
Flames
Inlets
Luminosity
Mass flow rate
Nuclear fuels
Reactants
Soot
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Summary:To date there is no universal agreement as to the interaction between fuel type, fuel-air mixture preparation combustion chamber flow characteristics and their effect on soot formation. A propane fueled modified conical backmixed steady flow reactor was built in which the fuel and air could be mixed together in varying degrees and reacted in at different mixing intensities. The onset of soot and soot loading were determined qualitatively by a photomultiplier focused on the volume inside the reactor. Increasing the degree of premix from a diffusion flame to a distribution of Φmax/Φavg = 5.0 resulted in increases of 3 to 17 percent of the soot-onset equivalence ratio and decreases in soot loading down to zero. Changes in the mixing intensity from 32.5 sec⁻¹ to 75.7 sec⁻¹ resulted in a change in the soot-onset equivalence ratio from 1.26 to 1.52. Soot loading was found to depend on both the mixing intensity, β, and the average number of mixes per mean residence time, β/α.
ISSN:0096-736X
2577-1531