Soot Formation in a Shock Tube under Elevated Pressure Conditions

High pressure soot formation from methane, ethylene, acetylene, propane and n-heptane was studied at rich burning conditions applying the shock tube technique. Pressure behind reflected shock was varied between 15 and 100 bar. Time resolved measurements of soot particle diameter and number density w...

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Bibliographic Details
Published in:Combustion science and technology 1996-03, Vol.113 (1), p.67-80
Main Authors: KELLERER, H., MÜLLER, A., BAUER, H.-J., WITTIG, S.
Format: Article
Language:English
Subjects:
environmental studies
pressure
shock tube
Soot
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Summary:High pressure soot formation from methane, ethylene, acetylene, propane and n-heptane was studied at rich burning conditions applying the shock tube technique. Pressure behind reflected shock was varied between 15 and 100 bar. Time resolved measurements of soot particle diameter and number density were carried out using an extinction-scattering technique at 488 nm. It could be shown that soot formation at high pressures is characterized by particle diameters below 30 nm that decrease with pressure. The corresponding high particle number densities in the range of N≈10 12 - 10 13 1/cm 3 turned out to be considerably higher than at atmospheric conditions. This behavior has to be attributed to reduced coagulation coefficients in the transition regime between free molecular and continuum flow. It was found that an increase in carbon concentration has a strong promoting influence on soot volume fraction. Total pressure, however, does significantly enhance soot yield at pressures up to 30 bar and loses its dominance at higher pressures.
ISSN:0010-2202
1563-521X
DOI:10.1080/00102209608935488