高层建筑火灾烟气控制模式的数值分析

根据我国现有高层建筑所采用的主要防排烟方式,采用CFD的方法完成了火灾时烟气的不同控制模式的模拟,并对不同的防排烟模式的模拟结果进行比较.结果表明当采用走道排烟加前室门设置空气幕或前室和楼梯间的加压防烟时,其烟气空气效果基本一致,均不能满足整个建筑的安全疏散时间的要求,但空气幕防烟较加压防烟所需新鲜空气量更少,能有效防止火灾的进一步扩大和控制烟气扩散.当采用空气幕加前室或楼梯间加压的组合防烟时,能较好的控制烟气的扩散,满足安全疏散时间的要求,即可以用空气幕和加压的组合来代替传统的前室和楼梯间加压的防烟方式.本文的研究成果可以为合理的设计高层建筑火灾时烟气的控制方式提供了一定的理论依据.

Numerical Simulation of Fire Smoke Control Models in High-Rise Buildings

According to the main methods used for smoke controlling in our country now,the CFD was used to simulate the different smoke control models when firing.It can be concluded that the smoke control effect is similar but both can't meet the safety evacuation time when using the air curtain or atria and stair well adding pressure besides aisle smoke exhausting.Nevertheless,the fresh air needed by air curtain is less than adding pressure in the atria,this can prevent the fire from expanding and control smoke diff...