摘要
为研究火灾对地铁站台顶棚烟气特性和热辐射的影响,建立了小尺寸实验模型、全尺寸FDS数值模型及类似指数函数的经验模型,模拟了不同火源位置、火源功率下站台纵向距离对地铁顶棚下烟气温度的影响。结果表明:站台顶棚下的烟温与距火源纵向距离密切相关,纵向温度分布均符合指数衰减规律;类似指数函数的经验模型中顶棚下无量纲峰值温度与无量纲距离成反比,拟合得到参数k为-4.791的顶棚纵向烟温预测公式,预测值与模拟值最大误差在±16.1%的范围内。该研究有助于控制站台火灾时烟气带来的高温,减少人员伤亡。
This paper seeks to investigate the influence of fire on the smoke characteristics and heat radiation of subway platform roof.The study is focused on simulating the influence of platform longitudinal distance on smoke temperature under subway roof under different fire source position and power by developing a small-size experimental model,a full-size FDS numerical model and an empirical model similar to exponential function.The results show that the smoke temperature under platform roof is closely related to the longitudinal distance from fire source and the uniform longitudinal temperature distribution conforms to exponential attenuation law;in the empirical model similar to exponential function,the dimensionless peak temperature is inversely proportional to the dimensionless distance;the prediction formula of ceiling longitudinal smoke temperature with parameter k of-4.791 is obtained by fitting;and the maximum error between the predicted value and the simulated value is within the range of±16.1%.The research could help control the high temperatures caused by smoke during platform fires and reduce casualties.
作者
张迎新
武璇
李日军
Zhang Yingxin;Wu Xuan;Li Rijun(School of Safety Engineering, Heilongjiang University of Science & Technology, Harbin 150022, China)
出处
《黑龙江科技大学学报》
2021年第5期605-612,共8页
Journal of Heilongjiang University of Science And Technology
基金
黑龙江省自然科学基金资助项目(LH2020E122)。
关键词
顶棚烟温
预测公式
FDS数值模拟
ceiling smoke temperature
forecast formula
FDS numerical simulation
