Impact of acoustic forcing on soot evolution and temperature in ethylene-air flames

Agnes Jocher, Kae Ken Foo, Zhiwei Sun, Bassam Dally, Heinz Pitsch, Zeyad Alwahabi, Graham Nathan

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

The transient coupling of soot formation flame chemistry and fluid transport in ethylene-air coflow flames at 20 and 40 Hz acoustic forcing frequencies were studied. Forcing at different frequencies and amplitudes resulted to very distinct transient soot temperature and flow conditions. The steady ethylene-air flame was excited with 20 and 40 Hz corresponding to 0.23 and 0.46 Strouhal numbers. For both frequencies forcing amplitudes of 20% 50% and 60% were numerically considered and validated against measurements at 50%. A reduction in maximum soot volume fraction for the increased forcing frequency was experimentally and numerically observed. The decrease in maximum soot volume fraction is attributed by a residence time analysis presenting shorter maximum fluid parcel residence times for the 40 Hz than for the 20 Hz case. At 40 Hz the transient evolution of maximum soot production and forced fuel velocity was almost synchronized while at 20 Hz a time lag of 32.5 ms was noted corresponding to 65% of a full period.
Original languageEnglish (US)
Pages (from-to)781-788
Number of pages8
JournalProceedings of the Combustion Institute
Volume36
Issue number1
DOIs
StatePublished - Jan 1 2017
Externally publishedYes

Bibliographical note

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

ASJC Scopus subject areas

  • General Chemical Engineering
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

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