کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7049591 | 1457162 | 2013 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of blockage-fire distance on buoyancy driven back-layering length and critical velocity in a tunnel: An experimental investigation and global correlations
ترجمه فارسی عنوان
اثر فاصله انفجار-آتش در طول پشت لایه برداری و سرعت بحرانی شناور در یک تونل: یک مطالعه تجربی و همبستگی جهانی
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کلمات کلیدی
آتش تونل، طول پشت لایه ای، سرعت بحرانی، فاصله انسداد وسیله نقلیه، تهویه طولی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Experiments are conducted in a model tunnel to study the effect of a vehicular blockage at the upstream of the fire source on the buoyancy driven back-layering length and critical velocity in a longitudinal ventilated tunnel. The relative distance between the vehicular blockage and fire source are ranged in 1 m â¼Â 6 m. It is found that with no blockage, experimental data on back-layering length and critical velocity can be well collapsed by Wu model and Li model, respectively. However, with the increase in blockage-fire distance, both the back-layering length and critical velocity first decrease then approach to constants similar to those with no blockage. The modified Wu model and Li model amended by cross-sectional blockage ratio proposed by Lee, which does not include the factor of blockage-fire distance, still fail to predict experimental results for different blockage-fire distances. Thus a dimensionless modification coefficient η is proposed and correlated non-dimensionally with the normalized blockage-fire distance to account for this effect. Finally, global models are proposed to predict back-layering length and critical velocity including factors of both cross-sectional blockage ratio and blockage-fire distance, which are shown to well collapse the experimental measurements in good agreement.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 60, Issues 1â2, 2 October 2013, Pages 7-14
Journal: Applied Thermal Engineering - Volume 60, Issues 1â2, 2 October 2013, Pages 7-14
نویسندگان
W. Tang, L.H. Hu, L.F. Chen,