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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

DNS AND LES OF SOOT FORMATION IN OXY-FUEL SPRAY FLAME: APPLICATION OF A NON-ADIABATIC FLAMELET/PROGRESS-VARIABLE APPROACH

Get access (open in a dialog) DOI: 10.1615/IHTC16.cat.022496
pages 1531-1537

Resumo

Soot formation in oxy-fuel spray flames is investigated for oxygen combustion by performing two-dimensional direct numerical simulations (DNS) and three-dimensional large-eddy simulations (LES) of oxy-fuel spray flames. As the combustion model, a non-adiabatic procedure of flamelet/progress-variable approach (NA-FPV) considering 113 chemical species and 891 reactions is employed. The DNS results show that compared to the conventional flamelet/progress-variable approach (FPV), the NA-FPV successfully predicts the soot formation characteristics of the oxy-fuel spray flame. This is because the changes in the composition of chemical species such as OH and CO, which are caused by the heat loss in the gas phase due to latent heat of evaporation of fuel droplet and radiative heat transfer, are accurately reproduced by the NA-FPV. The LES results also show that the NA-FPV can adequately capture the characteristics of the oxy-fuel spray flame and the effect of ambient gas pressure on the soot formation.