| Title: |
Experimental studies on the influence of smoke acceleration effect feedback to the flame behavior in the U shaped shaft of a high-rise building. |
| Authors: |
Li, Man1 (AUTHOR) liman312@hqu.edu.cn, Shen, Yize1 (AUTHOR), Cai, Zhongkun1 (AUTHOR), Xiao, Qishen1 (AUTHOR), Hu, Haowei1,2 (AUTHOR) huhw@ustc.edu.cn |
| Source: |
International Journal of Thermal Sciences. Feb2025, Vol. 208, pN.PAG-N.PAG. 1p. |
| Subject Terms: |
*HEAT release rates, *EXPONENTIAL decay law, *ENTHALPY, *TEMPERATURE distribution, *HEAT transfer |
| Abstract: |
This paper presents an experimental investigation of the feedback effect with smoke acceleration on flame behaviors in the U shaped shaft of a high-rise building. Heat release rate of the fire, depths and widths of the U shaped shaft are changed. The flame height, vertical maximum temperature in the open shaft and the heat flux distribution on the façade are studied. Results show that the flame height is elongated by the smoke acceleration effect in the U shaped shaft and larger than that in the open space. Correlations for the flame height are established by taking into account the geometries of the U shaped shaft. The vertical maximum temperature in the U shaped shaft first decreases rapidly then keeps room temperature, which are compared with that under stack effect in the staircase. The exponential decay law between the vertical maximum temperature and height is modified. The total heat flux is mainly affected by the width and heat release rate. Radiation heat transfer fraction is larger than 80 % in the continuous and intermittent flame regions, of which the flame emissivity is about 0.53. [ABSTRACT FROM AUTHOR] |
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| Database: |
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