Impact of soot on flame flicker

Viswanath R. Katta, William M. Roquemore, Arvind Menon, Seong Young Lee, Robert J. Santoro, Thomas Litzinger

Research output: Contribution to journalConference article

30 Citations (Scopus)

Abstract

The impetus for the present study is a perceived anomaly in which a vertically mounted ethylene jet diffusion flame used to study soot is observed to be steady; whereas similar flames used in other studies have been observed to flicker or oscillate at a frequency of about 12 Hz. This difference raises a question as to why the sooting flame is steady. A well-validated, Navier-Stokes-based, time-dependent numerical code is used to provide an answer to this question. A prediction is made, and later confirmed by experiments, of a phenomenon that is new to the authors and perhaps to the combustion community. That is, soot radiation can influence flame flicker resulting from a buoyancy-induced instability to such a point that the oscillation is completely suppressed. Experiments are used to validate the prediction and the result of numerical studies of the impact of soot on flame flicker. It is found that in a jet diffusion flame, the magnitude of flame oscillations (flicker) decreases with the amount of soot generated in the flame; however, the frequency of the oscillations does not change. Good agreement is obtained between measurements and computations for the dynamic behavior of flames with different soot levels. Both experiments and calculations yield a steady flame when the generated soot is sufficiently high and then produce the initial dynamic flame when the soot formation is restricted. The impact of soot on flame flicker is further studied by performing a simulation for the sooty flame after neglecting radiation from soot.

Original languageEnglish (US)
Pages (from-to)1343-1350
Number of pages8
JournalProceedings of the Combustion Institute
Volume32 I
DOIs
StatePublished - Jan 1 2009
Event32nd International Symposium on Combustion - Montreal, QC, Canada
Duration: Aug 3 2008Aug 8 2008

Fingerprint

Soot
flicker
soot
flames
diffusion flames
oscillations
Radiation
Experiments
Buoyancy
radiation
predictions
Ethylene
buoyancy
ethylene

All Science Journal Classification (ASJC) codes

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

Cite this

Katta, V. R., Roquemore, W. M., Menon, A., Lee, S. Y., Santoro, R. J., & Litzinger, T. (2009). Impact of soot on flame flicker. Proceedings of the Combustion Institute, 32 I, 1343-1350. https://doi.org/10.1016/j.proci.2008.06.152
Katta, Viswanath R. ; Roquemore, William M. ; Menon, Arvind ; Lee, Seong Young ; Santoro, Robert J. ; Litzinger, Thomas. / Impact of soot on flame flicker. In: Proceedings of the Combustion Institute. 2009 ; Vol. 32 I. pp. 1343-1350.
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Katta, VR, Roquemore, WM, Menon, A, Lee, SY, Santoro, RJ & Litzinger, T 2009, 'Impact of soot on flame flicker', Proceedings of the Combustion Institute, vol. 32 I, pp. 1343-1350. https://doi.org/10.1016/j.proci.2008.06.152

Impact of soot on flame flicker. / Katta, Viswanath R.; Roquemore, William M.; Menon, Arvind; Lee, Seong Young; Santoro, Robert J.; Litzinger, Thomas.

In: Proceedings of the Combustion Institute, Vol. 32 I, 01.01.2009, p. 1343-1350.

Research output: Contribution to journalConference article

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Katta VR, Roquemore WM, Menon A, Lee SY, Santoro RJ, Litzinger T. Impact of soot on flame flicker. Proceedings of the Combustion Institute. 2009 Jan 1;32 I:1343-1350. https://doi.org/10.1016/j.proci.2008.06.152