TY - GEN
T1 - Large eddy simulation of a piloted turbulent jet flame
AU - Xuan, Y.
AU - Blanquart, G.
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:84943609131
T3 - Fall Technical Meeting of the Western States Section of the Combustion Institute, WSS/CI 2013 Fall Meeting
SP - 241
EP - 251
BT - Fall Technical Meeting of the Western States Section of the Combustion Institute, WSS/CI 2013 Fall Meeting
PB - Western States Section/Combustion Institute
T2 - Fall Technical Meeting of the Western States Section of the Combustion Institute, WSS/CI 2013
Y2 - 7 October 2013 through 8 October 2013
ER -