【摘要】 在火灾烟气迁移和机械加压补风的理论研究基础上,基于FDS火灾模拟软件的大涡模拟(LES)及Smagorinsky亚格子尺度模型对某大学宿舍楼进行实体建模。危害性气体CO在水平方向上的体积分数演变非常相近,火源处产生的危害性气体成分能够沿着水平方向传播到远距离处而自身体积分数的变化很小,CO的体积分数峰值随高度呈现明显的阶梯变化。数值模拟结果证明,火灾中大量的人员都死于远距离处的主要原因可能是吸入了大量迎面而来的(而不是身后面赶上的)烟气中危害性气体CO,由此对建筑防火结构设计中针对高层建筑火灾烟气迁移问题提出了改进意见。更多还原

【Abstract】 On the foundation of theoretical research of fire smoke transfer and mechanical wind-supply,modeling the dormitory building based on FDS large eddy simulation(LES) and Smagorinsky Sub-grid scale model.The harmful gas CO concentration changed similar in the horizontal direction,the products of harmful gas composition can spread to the long-distance along the horizontal direction and own concentration little changed,CO concentration peak changed ladder-like with the height significantly.From the numerical simulation results,it had been proved that why a large number of staff have died in the long-distance.The main reason may be that people inhaled a lot of the on-coming(not coming back) harmful gas CO and proposed improvements of the structural design of building fire against high-rise building fire smoke migration issues.更多还原