Displacement speed statistics in an open turbulent jet spray flame
نویسندگان
چکیده
In this study, a three-dimensional Direct Numerical Simulation of an open turbulent jet spray flame has been used to investigate the statistical behaviour displacement speed Sd and its components provide physical explanations for observed behaviours at different axial locations downstream exit. The exhibits fuel-lean conditions close exit but fuel-rich have further due evaporation fuel droplets. For considered, combustion takes place under low Damköhler number conditions. reaction progress variable isosurfaces shows qualitatively similar all considered – predominantly positive across major part with small, potentially negative, values towards burned-gas-side. arising from chemical rate normal molecular diffusion remain leading order contributors competition between these determines mean speed. These observations are consistent studies flames in canonical configurations premixed stratified flames. This suggests that flow geometry absence curvature might not be important determining components. Therefore, modelling methodologies employed can extended However, methodologies, which implicitly assume equality surface-weighted density-weighted local laminar burning velocity, rendered invalid
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ژورنال
عنوان ژورنال: Fuel
سال: 2021
ISSN: ['0016-2361', '1873-7153']
DOI: https://doi.org/10.1016/j.fuel.2020.119242