Hydrocarbon species concentrations in nitrogen diluted ethylene-air laminar jet diffusion flames at elevated pressures

Ranjith Kumar Abhinavam Kailasanathan*, Emily K. Book, Tiegang Fang, William Roberts

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

19 Scopus citations

Abstract

Hydrocarbon species concentrations are measured in a laminar jet diffusion flame at elevated pressures with the objective of better understanding soot production and oxidation mechanisms, which will ultimately lead to a reduction in soot emissions from practical combustion hardware. Samples were extracted from the centerline of an ethylene flame diluted with nitrogen. The diluted fuel and co-axial air top-hat exit velocities were matched and the mass fluxes were held constant at all pressures. This paper reports centerline concentration profiles of major non-fuel hydrocarbons and 5 different PAH species measured via extractive sampling with a quartz microprobe and quantification using GC/MS + FID. The peak concentration of acetylene decreased with increase in pressure, suggesting rapid conversion to heavier compounds, whereas the concentrations of the other major heavier non-fuel hydrocarbons increase with an increase in pressure. The measured peak species concentration as a function of pressure is seen to closely follow a power law function, Pn, where n varies from less than zero for acetylene, propane and diacetylene to greater than unity for the larger PAH species.

Original languageEnglish (US)
Pages (from-to)1035-1043
Number of pages9
JournalProceedings of the Combustion Institute
Volume34
Issue number1
DOIs
StatePublished - Jan 1 2013

Keywords

  • Extractive sampling
  • High pressure
  • Laminar flames
  • Non-fuel hydrocarbons
  • Soot formation

ASJC Scopus subject areas

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

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