Hydrodynamic and chemical effects of hydrogen addition on soot evolution in turbulent nonpremixed bluff body ethylene flames

Sili Deng, Michael E. Mueller, Qing N. Chan, Nader H. Qamar, Bassam B. Dally, Zeyad T. Alwahabi, Graham J. Nathan

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The evolution of soot in a turbulent nonpremixed bluff body ethylene/H2 (2:1 by volume) flame was examined using combined experiments and Large Eddy Simulations subsequently compared with a neat ethylene counterpart (Muelleret al. 2013). The maximum soot volume fraction in the recirculation zone and jet-like region of the ethylene/H2 case were remarkably lower than that of the ethylene case. Flamelet calculations showed that H2 addition suppressed soot formation due to C/H ratio reduction leading to an estimated fourfold reduction in soot volume fraction due to chemical effects. Soot reduction in the downstream jet-like region of the flame was quantitatively consistent with this chemical effect. Meanwhile soot reduction in the recirculation zone was significantly larger than this analysis implying an additional hydrodynamic effect.

Original languageEnglish (US)
Pages (from-to)807-814
Number of pages8
JournalProceedings of the Combustion Institute
Volume36
Issue number1
DOIs
StatePublished - Jan 1 2017

All Science Journal Classification (ASJC) codes

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

Keywords

  • Bluff body flame
  • Large Eddy Simulation (LES)
  • Laser-induced incandescence
  • Soot
  • Turbulent nonpremixed flame

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