Soot formation in ducted turbulent diffusion flames

T. Neill, I. M. Kennedy

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A vertical combustion wind tunnel has been built in which confined turbulent diffusion flames were studied. Measurements were made of the mean soot volume fraction in turbulent ethylene flames using laser extinction. Velocities were measured with LDV and radiation was detected with a wide view angle radiometer. The flames were burned under three conditions of axial pressure gradient, 0 Pa/m, -32 Pa/m and -92 Pa/m. The accelerating flow was produced by a converging wind tunnel working section. It was found that this modest favorable pressure gradient caused the soot loading to fall by one-half with a commensurate fall in the radiation emitted by the flame. The flame was shorter when it was accelerated. Turbulence intensities were also greater in the convergent duct. The results indicate the potential impact of pressure gradients on the relatively slow chemistry of soot formation.

Original languageEnglish (US)
Title of host publication28th Aerospace Sciences Meeting, 1990
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
StatePublished - 1990
Event28th Aerospace Sciences Meeting, 1990 - Reno, United States
Duration: Jan 8 1990Jan 11 1990


Other28th Aerospace Sciences Meeting, 1990
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Aerospace Engineering


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