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Experimental study on the effect of canyon cross wind on temperature distribution of buoyancy-induced smoke layer in tunnel fires

引用

Transportation Safety and Environment 2021年第4期3卷 74-90页

作者： Chuangang Fan Liliang Yang Dia Luan Tao Chen Ao Jiao Richeng Ouyang Juan Wang Changkun Chen School of Civil Engineering Central South UniversityChangsha 410075HunanChina Hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structures Central South UniversityChangsha 410075HunanChina

Experiments were conducted in a 1:20 arced tunnel model to investigate the effect of canyon cross wind on buoyancy induced smoke flow characteristics of pool fres,involving smoke movement behaviour and longitudinal temperature distribution of smoke *** canyon wind speed,longitudinal fre location and fre size were *** show that there are two special smoke behaviours with the fre source positioned at different flow feld *** the fire source is positioned at the negative pressure zone,with increasing canyon wind speed,the smoke always exists upstream mainly due to the vortex,and the smoke temperature near the fire source increases frst and then ***,when the fre source is located in the transition zone and the unidirectional flow zone,there is no smoke appearing upstream with a certain canyon wind ***,the smoke temperature near the fre sources are decreases with increasing canyon wind *** dimensionless temperature rise of the smoke layer OT:*along the longitudinal direction of the tunnel follows a good exponential *** the canyon wind speed increases,the longitudinal decay rate of△T.**** longitudinal decay rate of AT*downstream of the fire is related to the fre location and canyon wind speed,and independent of the fire *** empirical correlations for predicting the longitudinal decay of OT:*downstream of the fre are *** a relatively large-scale fre,the longitudinal decay rate of AT:*upstream of the fire increases as the distance between the fire source and the upstream portal increases,especially for larger canyon wind speeds.

关键词： tunnel fires canyon cross wind smoke movement behaviour smoke layer temperature temperature decay

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