کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
269802 504702 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Self induced buoyant blow off in upward flame spread on thin solid fuels
ترجمه فارسی عنوان
شعله ور شدن خود را ناشی از شعله ور شدن بالا در سوخت های جامد نازک
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی


• Upward flame spread experiments were conducted on thin fabric of various widths.
• One sided flame extinction was observed for sample widths less than 5 cm.
• Extinguishing flames were from large seemingly robust fires.
• Extinction mechanism is proposed based on blow off from buoyancy driven entrainment.
• Simulation flow field graphs are discussed to support proposed mechanism.

Upward flame spread experiments were conducted on long thin composite fabric fuels made of 75% cotton and 25% fiberglass of various widths between 2 and 8.8 cm and lengths greater than 1.5 m. Symmetric ignition at the bottom edge of the fuel resulted in two sided upward flame growth initially. As flame grew to a critical length (15–30 cm depending on sample width) fluctuation or instability of the flame base was observed. For samples 5 cm or less in width, this instability lead to flame blow off on one side of the sample (can be either side in repeated tests). The remaining flame on the other side would quickly shrink in length and spread all the way to the end of the sample with a constant limiting length and steady spread rate. Flame blow off from the increased buoyancy induced air velocity (at the flame base) with increasing flame length is proposed as the mechanism for this interesting phenomenon. Experimental details and the proposed explanation, including sample width effect, are offered in the paper.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fire Safety Journal - Volume 71, January 2015, Pages 279–286
نویسندگان
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