Experimental study on thermal stratification characteristics in tunnel fires under the effect of canyon cross wind
发布时间：2022-02-25
点击次数：
影响因子：4.082
DOI码：10.1016/j.jweia.2021.104756
发表刊物：JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
关键字：Tunnel fireCanyon cross windReduced-scale experimentThermal stratificationSmoke layer thickness
摘要：In order to investigate the thermal stratification characteristics induced by pool fire and canyon cross wind, a set of tests were carried out in a 1:20 model tunnel. Experimental parameters were the canyon wind speed, longitudinal fire location and fire size. Results show that the dimensionless smoke layer thickness h* (the ratio of smoke layer thickness to hydraulic diameter) downstream the fire generally increases with increasing canyon wind speed until reaching the maximum value, and h* of a smaller-scale fire is slightly greater than that of a larger-scale fire at most canyon wind speeds. However, h* value upstream the fire is almost between 0.2 and 0.3 (h* = 0 is not considered). The smoke stratification downstream the fire gradually worsens with increasing canyon wind speed and decreasing distance between the fire source and the upstream portal D-f in the cases of 0.194 <= D-f* < 1 (D-f* represents the ratio of D-f to the tunnel length), while the smoke stratification upstream the fire is always obvious unless there is no smoke. As D-f increases, the critical Froude number for judging the smoke stratification status decreases first for 0 <= D-f* < 0.028 and then increases for 0.028 <= D-f* < 0.306, and tends to be a constant value for 0.306 <= D-f* < 1.
论文类型：期刊论文
通讯作者：Yang, LL; Fan, CAG*; Luan, DA; Ouyang, RC; Tao, HW; Xu, ZS; Wang, FY*
学科门类：工学
一级学科：动力工程及工程热物理
文献类型：J
卷号：218
页面范围：104756
ISSN号：0167-6105
是否译文：否
发表时间：2021-10-08
收录刊物：SCI