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实验研究结果表明:当模型的形状系数小于2时,烟气形成自上而下的填充方式,烟气界面和水平面平行;当形状系数大于等于2时,烟气形成狭长空间的填充方式,而且形状系数越大,该填充方式越明显。在两种烟气填充方式下,烟气浓度分布特点不同:形状系数小于2时,烟气浓度在同一个水平面内分布相对均匀;形状系数大于等于2时,烟气浓度在同一水平面内分布很不均匀,远离火源处的烟气浓度远高于火源附近区域的烟气浓度。地下狭长、封闭空间的烟气填充方式对人员逃生不利,在制定地下建筑防火排烟逃生预案时应予以充分考虑。
Experimental results show that flue gas forms a top-down filling mode when the shape coefficient of the model is less than 2, and the flue gas interface is parallel to the horizontal plane. When the shape coefficient is greater than or equal to 2, the flue gas forms a filling space in a narrow space, The larger the shape factor is, the more obvious the filling method is. In the two kinds of flue gas filling mode, the flue gas concentration distribution characteristics are different: the shape factor is less than 2, the flue gas concentration in the same horizontal plane distribution is relatively uniform; shape factor greater than or equal to 2, the flue gas concentration in the same horizontal distribution Inhomogeneous, the flue gas concentration far away from the fire source is much higher than the flue gas concentration in the area near the fire source. Underground narrow, open space flue gas filling unfavorable to personnel escape, in the development of underground building fire escape plan should be fully taken into account.