On the relative contributions of soot to radiative heat transfer at different oxygen indices in ethylene – O2/CO2 laminar diffusion flames
نویسندگان
چکیده
Soot concentration measurements in ethylene-O2/CO2 diffusion flames (fuel Re 120) encompassing oxidizer oxygen mole fractions (oxygen index, OI) of 35% to 90% were employed validate a methodology for modeling soot production. A skeletal 10-step reaction mechanism and the nucleation parameter (Cα) Moss-Brookes model as function OI provided adequate agreement with measurements. Cross-validation based Cα was ascertained through flame simulations different experimental configuration 43, 35%-50% O2) by ensuring that peak concentrations good previously published results. mesh resolution 0.0625 mm within deemed necessary obtain grid independent Despite increases volume temperatures OI, radiant fraction (χR) (in-flame) decreases due decreasing lengths. Although in-flame radiation is dominated gases, spectrally-continuous plays an important role on χR (when it assessed across entire domain) attenuation cold, radiatively-participating, co-flow. Consequently, show strong sensitivity gas-radiative property models whereas when domain impacted choice radiative model.
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ژورنال
عنوان ژورنال: Fuel
سال: 2021
ISSN: ['0016-2361', '1873-7153']
DOI: https://doi.org/10.1016/j.fuel.2020.119269