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A study on buoyancy-driven maximum ceiling gas temperature of T-shaped bifurcated channel-like structure in fire environment
International Journal of Thermal Sciences ( IF 4.5 ) Pub Date : 2021-08-14 , DOI: 10.1016/j.ijthermalsci.2021.107213
Yulun Zhang 1 , Changkun Chen 1 , Peng Lei 1 , Weibing Jiao 1 , Tong Xu 1 , Yanling Nie 1
Affiliation  

A study mainly concerning the fire-induced maximum ceiling smoke temperature in T-shaped bifurcated channel-like structure was conducted. A series of model-scale fire tests and full-scale numerical simulations were performed to obtain the maximum ceiling smoke temperature with various heat release rates and branch widths. Results shown that the branch could affect plume entrainment flow in vicinity of fire source. Flame plume would tilt to the proximal sidewall to some extent. With the increase of branch opening, flame plume tilt seems to be greater. The growth trend of central ceiling smoke temperature directly above fire source with burning time can be effectively characterized by power function (Tsn1tn2). In current research range of model structure scale and heat release rate, maximum ceiling smoke temperature of T-shaped bifurcated channel slightly decreases with the increase of dimensionless branch width. A corresponding empirical correlation for maximum ceiling smoke temperature in such fire scenario is proposed by associating dimensionless branch width and dimensionless heat release rate. The prediction of empirical correlation could be supported by current measured results in model-scale fire tests and full-scale numerical simulations, as well as the previous scholars' model-scale and full-scale data.



中文翻译:

火灾环境中T形分叉通道状结构浮力驱动的最高顶棚气体温度研究

主要研究了T形分叉通道状结构中火灾引起的最高顶棚烟温。进行了一系列模型规模的火灾测试和全尺​​寸数值模拟,以获得具有各种热释放速率和分支宽度的最大天花板烟雾温度。结果表明,分支会影响火源附近的羽流夹带流。火焰羽流会在一定程度上向近端侧壁倾斜。随着分支开口的增加,火焰羽流倾斜似乎更大。火源正上方中央顶棚烟温随燃烧时间的增长趋势可以用幂函数有效表征(n1n2)。在目前的模型结构规模和放热率研究范围内,T形分叉通道的最高顶棚烟温随着无量纲分支宽度的增加而略有降低。通过将无量纲分支宽度和无量纲放热率相关联,提出了这种火灾情况下最大天花板烟温的相应经验相关性。目前模型尺度火灾试验和全尺度数值模拟的实测结果,以及以往学者的模型尺度和全尺度数据可以支持经验相关性的预测。

更新日期:2021-08-15
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