کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6639103 | 461164 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Flame radiation fraction behaviors of sooty buoyant turbulent jet diffusion flames in reduced- and normal atmospheric pressures and a global correlation with Reynolds number
ترجمه فارسی عنوان
فراوانی نسبی تابش شعله ای از شعله های نفوذ جت پرانرژی جوی در فشارهای کاهش یافته و طبیعی جو زمین و همبستگی جهانی با تعداد رینولدز
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کلمات کلیدی
شعله نفوذ جت شناور آشفته، کاهش فشار اتمسفر، کسری تابشی شعله، تعداد رینولدز،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
This paper reports new experimental observations on flame radiation fraction of sooty turbulent buoyant jet diffusion flames in a reduced atmospheric pressure (at high altitude in Tibet) and corresponding scaling theoretical interpretations. A global correlation of the flame radiation fraction with Reynolds number is proposed for both the reduced- and normal pressures. Experiments are carried out in both Hefei (altitude: 50 m) with atmospheric pressure of 100 kPa and Lhasa (altitude: 3650 m) with atmospheric pressure of 64 kPa. The turbulent buoyant jet diffusion flames are produced by nozzles with diameters of 4, 5, 6, 8 and 10 mm using propane as fuel at different flow rates. The emitted thermal radiation fluxes by the flames, for both attached condition and lifted off condition, are measured by a water-cooled radiometer. The flame radiation fraction change due to pressure reduction is clarified. Results show that the flame radiation fraction changes little with atmospheric pressure. A dimensional scaling theory is proposed to interpret this pressure dependency behavior. The flame radiation fraction for attached flame is found to be higher than that for lifted-off flame, decreasing in both cases with increasing nozzle fuel velocity or turbulent mixing at the flame base. Such decreasing behavior is found to be well fitted globally by a negative power law function on source Reynolds number (ÏR â¼Â Reâ0.32) of the discharged fuel flow at the nozzle.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel - Volume 116, 15 January 2014, Pages 781-786
Journal: Fuel - Volume 116, 15 January 2014, Pages 781-786
نویسندگان
Longhua Hu, Qiang Wang, Michael Delichatsios, Shouxiang Lu, Fei Tang,