Experimental study on thermal smoke backlayering length with an impinging flame under the tunnel ceiling

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• 作者：Chuan Gang Fan^a ; ^c ; ^{fangang@hfut.edu.cn} ; Jian Yang^b
• 关键词：Heat release rate ; Tunnel cross section ; Mechanical ventilation ; Critical velocity ; Backlayering length
• 刊名：Experimental Thermal and Fluid Science
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：82
• 期：Complete
• 页码：262-268
• 全文大小：485 K
• 卷排序：82

文摘

Backlayering length increases with the increasing tunnel cross-sectional area. As tunnel height or width increases, blockage effect of flame inside tunnel is reduced. A smaller local ventilation velocity occurs with increasing tunnel cross-sectional area. New dimensionless forms of backlayering length and ventilation velocity are introduced. The new model can correlate well with data from both full and model scale tests.