Effects of fuel structure on soot precursors in a laminar co-flow flame

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Abstract

The goal of this work is to aid in understanding the effects of fuel molecular structure on the spatial development of polycyclic aromatic hydrocarbons (PAH), or soot precursors, in an axisymmetric, co-flow, laminar flame configuration at atmospheric pressure. Two fuels with varying molecular structure are investigated: iso-octane/n-dodecane mixture and m-xylene/n-dodecane mixture. The flames investigated are non-premixed and rich premixed (jet equivalence ratio of 6) flames, and the total carbon flow rate is kept constant to facilitate comparison between fuels. A laser-induced fluorescence technique is used to obtain spatially-resolved PAH in the jet flames. The PAH are identified into two classes: single/two ring aromatics (small) and molecules having three/four rings (large). The experimental results indicate that the level of aromatics for m-xylene/n-dodecane fuel is higher compared to isooctane/n-dodecane fuel. The comparison of PAH in non-premixed and premixed flames show significant differences in the spatial development of PAH along the downstream direction. These results are compared to initial simulation results and a methodology for using the PAH-LIF technique for validating soot models in laminar jet flames is proposed.

Original languageEnglish (US)
StatePublished - Jan 1 2016
Event2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016 - Princeton, United States
Duration: Mar 13 2016Mar 16 2016

Other

Other2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016
CountryUnited States
CityPrinceton
Period3/13/163/16/16

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All Science Journal Classification (ASJC) codes

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

Cite this

Makwana, A., Jain, A., Linevsky, M., Iyer, S. S., Santoro, R., Litzinger, T., Xuan, Y., & O'Connor, J. A. (2016). Effects of fuel structure on soot precursors in a laminar co-flow flame. Paper presented at 2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016, Princeton, United States.