Abstract The present study aims at understanding the influence of differential diffusion on the evolution of flow field and soot volume fraction. For this purpose, two different turbulent diffusion flames (Delft flame III, pilot stabilized natural gas flame and an unconfined turbulent lifted ethylene/air jet flame) are investigated for flow field and soot predictions. The presumed shape multi-environment Eulerian PDF (EPDF) is used as turbulence-chemistry interaction model, while the radiative heat-transfer equation is modeled based on the truncated series expansion in spherical harmonics (P1 approximation). Two approaches are used to model diffusivity, a unity Lewis Number, and multi-component diffusion approach. For predicting soot evolution, an acetylene-based semi-empirical model (Moss-Brookes model and Method of Moments (MOM) model is used. Both the models consider the inception, surface growth and oxidation processes of soot. The influence of temperature is included in terms of the effective absorption coefficient and turbulence-chemistry interaction effects are included in terms of a single variable PDF in terms of temperature. The predictions elucidate the influence of temperature on soot volume fraction. Differential diffusion results in an increase in the soot volume fraction.
Soot Formation in Turbulent Diffusion Flames: Effect of Differential Diffusion
Locomotives and Rail Road Transportation ; 193-216
2017-01-01
24 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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