کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
249771 | 502630 | 2008 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: An experimental study on the effect of ventilation velocity on burning rate in tunnel fires—heptane pool fire case An experimental study on the effect of ventilation velocity on burning rate in tunnel fires—heptane pool fire case](/preview/png/249771.png)
The 1/20 reduced-scale experiments using Froude scaling are conducted to investigate the effect of longitudinal ventilation velocity on the burning rate in tunnel fires. The n-heptane pool fires with heat release rate ranging from 3.71 to 15.6 kW are used in this study. A load cell is used to measure the mass loss rate of burning fuel and the temperature distributions are measured by K-type thermocouples in order to investigate smoke movement. The ventilation velocity in the reduced-scale tunnel is controlled by the wind tunnel through an inverter. The increases in ventilation velocity lead to enhance burning rate of n-heptane fuel. The reason is that the oxygen supply effect prevails rather than the cooling effect as the ventilation velocity increases. As a result, the heat release rates in experiment are larger than constant heat release rates by 4.45–11.3 times in the n-heptane pool fires. Also, it is found that non-dimensional critical ventilation velocity is proportional to one-third power of non-dimensional heat release rate.
Journal: Building and Environment - Volume 43, Issue 7, July 2008, Pages 1225–1231