Planar laser-induced incandescence of turbulent sooting flames: the influence of beam steering and signal trapping

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

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

The influence of beam steering and signal trapping on the accuracy of soot volume fractions measured using planar laser-induced incandescence (LII) has been investigated in turbulent non-premixed sooting flames at atmospheric pressure. In turbulent non-premixed C2H4/air flames, the influence of local de-focusing/focusing of the laser sheet from beam steering can result in the underestimate of the averaged LII signal by 30 %, even when operating within the so-called plateau regime of laser fluence. Beam steering was also found to be significant in both the upstream region of C2H4/air flames and non-reacting C2H4 flows, because the fuel has a relatively high refractive index compared with ambient air. The extent of beam steering at different heights of reacting and isothermal flows as well as its dependence on exit Reynolds number (Re) has been measured. The measurements reveal that even at low turbulence levels (2000 
Original languageEnglish (US)
Pages (from-to)731-743
Number of pages13
JournalApplied Physics B: Lasers and Optics
Volume119
Issue number4
DOIs
StatePublished - Jun 26 2015
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2022-09-12

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physics and Astronomy (miscellaneous)

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