Large eddy simulation of a piloted turbulent jet flame

Y. Xuan, G. Blanquart

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, Large Eddy Simulations (LES) have been performed on an ethylene/air piloted turbulent sooting jet flame to examine the importance of chemistry-turbulence interaction. The current work focuses on the effects of turbulent transport on the formation of Polycyclic Aromatic Hydrocarbons (PAH). These species are of primary importance since their concentrations control directly the soot nucleation rates. The Flamelet/Progress Variable (FPV) approach is adopted to describe the combustion of all gas phase species except for PAH. Radiative heat transfer is considered by introducing enthalpy defect as an additional parameter in the FPV model. This parameter represents a measure of the departure from the non-radiating flamelet solutions. The FPV model accounting for radiative heat losses is closed in the current LES using a presumed subfilter Probability Density Function (PDF) approach. Given the large time scale related to PAH formation, PAH species exhibit large unsteady effects. To model these effects, transport equations are solved for these species. The chemical source terms are closed using a recently developed linear relaxation model. The importance of the interactions between turbulence and PAH chemistry is highlighted by comparing the PAH yield resulting from the LES to steady state flamelet predictions.

Original languageEnglish (US)
Title of host publicationFall Technical Meeting of the Western States Section of the Combustion Institute, WSS/CI 2013 Fall Meeting
PublisherWestern States Section/Combustion Institute
Pages241-251
Number of pages11
ISBN (Electronic)9781629935843
StatePublished - Jan 1 2013
EventFall Technical Meeting of the Western States Section of the Combustion Institute, WSS/CI 2013 - Fort Collins, United States
Duration: Oct 7 2013Oct 8 2013

Publication series

NameFall Technical Meeting of the Western States Section of the Combustion Institute, WSS/CI 2013 Fall Meeting

Other

OtherFall Technical Meeting of the Western States Section of the Combustion Institute, WSS/CI 2013
CountryUnited States
CityFort Collins
Period10/7/1310/8/13

All Science Journal Classification (ASJC) codes

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

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  • Cite this

    Xuan, Y., & Blanquart, G. (2013). Large eddy simulation of a piloted turbulent jet flame. In Fall Technical Meeting of the Western States Section of the Combustion Institute, WSS/CI 2013 Fall Meeting (pp. 241-251). (Fall Technical Meeting of the Western States Section of the Combustion Institute, WSS/CI 2013 Fall Meeting). Western States Section/Combustion Institute.