کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6593500 1423543 2018 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The impact of thermal diffusion on the structure of non-premixed flames
ترجمه فارسی عنوان
تأثیر انتشار حرارتی بر ساختار شعله های غیر مخلوط
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی
It is well understood how the flame structure of laminar non-premixed counterflow flames is influenced by differential diffusion, which is driven by species gradients, and corresponding models are available for physical and flamelet space. Thermal diffusion, driven by temperature gradients, is another process that leads to changes in the flame structure and can cause species separation due to differences in the thermal diffusion coefficients. In the present work, a systematic study quantifying the impact of thermal diffusion on the flame structure of non-premixed flames is carried out for five fuel-diluent-oxidizer systems. We also investigate the influence of curvature and strain and present a method for easily incorporating differential diffusion and cross-diffusional effects in flamelet modeling. The study is carried out for one-dimensional counterflow flames, tubular flames and a laminar two-dimensional coflow flame. Examples of flame structures are examined and compared to results obtained with an extended flamelet model, accounting for thermal diffusion and non-unity Lewis number diffusion.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Combustion and Flame - Volume 194, August 2018, Pages 352-362
نویسندگان
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