کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4920861 1429213 2017 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Comprehensive wind tunnel experiments of lofting and downwind transport of non-combusting rod-like model firebrands during firebrand shower scenarios
ترجمه فارسی عنوان
آزمایشات جامع تونل باد از حمل و نقل هوادهی و خنک کاری از مدل های شبیه به مدل های شبیه ساز غیر قابل احتراق در سناریوهای دوشش
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
To date, due to difficulties in making measurements during wildfires, much of what is known about firebrand showers and the subsequent fire spotting comes from mathematical modeling of the lofting and downwind transport of firebrands. However, these models lack experimental validation. Hence, the coupled lofting and downwind transport of non-combusting rod-like firebrands is experimentally modeled by releasing them through the velocity field of a large scale boundary layer wind tunnel. Complete trajectories of model firebrands are resolved using image processing algorithms. The results show a strong positive correlation between the maximum rise height (zmax) and the landing location (xl) of model firebrands. In addition, it is shown that, given the velocity field, the empirical probability density functions (PDF) of xl/zmax are similar regardless of the firebrands' aspect ratio. This implies that the lofting and downwind transport processes cannot be decoupled in transport models. Analysis of the data reveals that, the larger the aspect ratio of firebrands, the more sensitive their landing locations are to the variability in the velocity field through which they are released. The data set presented herein serves as the most comprehensive experimental evidence for not only firebrand transport studies but also for validating mathematical models for the flight of rod-like debris/brands within the velocity field of other extreme events such as hurricanes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fire Safety Journal - Volume 90, June 2017, Pages 95-111
نویسندگان
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