کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6468517 1423561 2017 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Comparison of multiple diagnostic techniques to study soot formation and morphology in a diffusion flame
ترجمه فارسی عنوان
مقایسه روش های مختلف تشخیصی برای مطالعه جابجایی و مورفولوژی در شعله پراکنده
کلمات کلیدی
لیزر ناشی از تابش نور، انقراض لیزری، طیف سنجی انتشار طیف طیفی، درج سریع ترموکوپل، تنفس سنجی ذرات نمونه برداری تاروفوریتی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی

Different non-intrusive optical and intrusive non optical diagnostic methods are used to measure flame and soot properties in a laminar coflow diffusion flame in order to compare and analyze the sensitivity of each technique to soot particles with different age and morphology. Flame temperature is measured using rapid thermocouple insertion (RTI) method and also by measuring soot spectral emissions (SSE). Soot volume fraction (fv) is measured quantitatively with laser extinction (LE), time resolved laser induced incandescent (TiRe-LII) and SSE methods and qualitatively from the transmission electron microscope (TEM) images of the thermophoretically sampled soot particles. Particle internal/aggregate nanostructure, and primary particle diameter are also analyzed based on TEM images from the sampled particles and TiRe-LII. It is shown that the optical methods are only sensitive to mature soot particles with solid appearance and cannot detect either temperature or fv in regions where liquid like nascent soot particles are dominant. fv measured by LE and TiRe-LII agree well while the values measured by SSE are lower. This discrepancy is attributed to the high sensitivity of fv measured by SSE to the measured temperature values. Temperature profiles measured by SSE are considerably higher than the values measured by RTI. It is shown that not considering the change of the surface emissivity of the thermocouple junction due to particle deposition for estimating radiation loss in regions where nascent or mature soot particles are dominant contributes to this discrepancy. Primary particle sizes measured based on TEM images and TiRe-LII agree reasonably well. Soot aggregate fractal dimension is shown to decrease as the soot particles age and become more mature.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Combustion and Flame - Volume 176, February 2017, Pages 567-583
نویسندگان
, , , , , , , , , ,