Formaldehyde Fluorescence as a Marker for Scalar Dissipation Through Local Extinction

Kathryn R. Gosselin, William F. Carnell, Michael W. Renfro

Research output: Contribution to journalArticlepeer-review

Abstract

A co-annular, counterflow diffusion burner was used to stabilize a local extinction point off centerline. Planar laser-induced fluorescence (PLIF) measurements of hydroxyl (OH) and formaldehyde (CH2O) were performed. The PLIF measurements were compared to results from a two-dimensional numerical simulation with a comprehensive chemical kinetics model, and good qualitative agreement is shown. Previous work has suggested that the formaldehyde fluorescence may be a useful marker for local scalar dissipation rate, which is difficult to measure directly. This relationship is further examined in this work for conditions including local extinction. Formaldehyde width is still a useful marker for local scalar dissipation within a vigorously burning flame. However, the formaldehyde fluorescence signal increases significantly following local extinction, so it cannot be used as a direct marker. A combination of formaldehyde fluorescence width and intensity can still help identify local extinction points and scalar dissipation rates just prior to extinction.

Original languageEnglish
Pages (from-to)1742-1758
Number of pages17
JournalCombustion Science and Technology
Volume187
Issue number11
DOIs
StatePublished - Nov 2 2015

Bibliographical note

Publisher Copyright:
Copyright © 2015 Taylor & Francis Group, LLC.

Keywords

  • Diffusion flames
  • Formaldehyde fluorescence
  • Local extinction
  • Scalar dissipation

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology
  • General Physics and Astronomy

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