Evolutions of gas temperature inside fire compartment and external facade flame height with a casement window

被引:21
作者
Sun, Xiepeng [1 ]
Hu, Longhua [1 ]
Yang, Yong [1 ]
Ren, Fei [1 ]
Fang, Xiang [1 ]
机构
[1] Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230026, Anhui, Peoples R China
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
Urban fire hazard and safety; Compartment fire; Casement window; Gas temperature inside compartment; Facade flame; HEAT FLUXES; BEHAVIOR; COMBUSTION; SPREAD; PROBE; WALL;
D O I
10.1016/j.jhazmat.2019.120913
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Gas temperature of a fire compartment and external facade flame height pose serious hazard upon urban environment and safety, where the window (ventilation) condition has an essential impact. This paper investigates their evolutions with a casement window of various opening angles, which has not been quantified previously although is commonly used practically. Experiments are conducted employing a model-scale fire compartment under different heat release rates with a casement window of various dimensions and opening angles. It is found that the upper-part gas temperature inside the compartment increases, while the critical heat release rate for flame ejection as well as the external facade flame height decreases, with increasing of the window opening angle as it is less than 60 degrees (theta < 60 degrees). Then, all these quantities change little as the window opening angle is further increased (theta >= 60 degrees). New non-dimensional models are proposed to describe the evolutions of these quantities based on the derived new length scale according to window dimensions and opening angle. This paper provides for the first time both essential data and new correlations for the gas temperature inside fire compartment and external facade flame height with a casement window.
引用
收藏
页数:12
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