Single-shot, Time-Resolved planar Laser-Induced Incandescence (TiRe-LII) for soot primary particle sizing in flames

Z. W. Sun, D. H. Gu, G. J. Nathan, Z. T. Alwahabi, B. B. Dally

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Two dimensional measurements of the size of soot primary particles, in both laminar and unsteady sooty C2H4/air flames, have been demonstrated in the present work. This is achieved using single-shot, time-resolved laser-induced incandescent (TiRe-LII) technique. The soot primary size is determined from the ratio of different signals obtained from four sequential images together with a theoretical relationship of the LII temporal decays. A laser fluence of 0.30 J/cm2 was chosen for its relevance to application in turbulent sooty flames where both laser fluence attenuation and beam steering are significant. Planar measurements are firstly demonstrated in a flat laminar flame and the results are found to be in good agreement with time-resolved single-point-measurements using a photomultiplier tube. A typical uncertainty of ±9 nm is estimated for the single-shot, planar measurements. Finally, planar measurements in an unsteady sooty flame reveal that the size of soot primary particles is very sensitive to local flame conditions.
Original languageEnglish (US)
Pages (from-to)3673-3680
Number of pages8
JournalProceedings of the Combustion Institute
Volume35
Issue number3
DOIs
StatePublished - Jan 1 2015
Externally publishedYes

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

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