基于正交分析的防烟缓冲区参数设置研究

为了研究典型长廊型高层建筑中走廊-前室缓冲区不同参数设置对烟气控制的影响,利用FDS软件建立长廊型高建筑火灾烟气运动模型。利用空气幕配合正压送风在前室门前形成防烟缓冲区,运用正交设计的方法分析流量比、空气幕射流速度以及空气幕射流角度对缓冲区防烟能力的影响,得出防烟缓冲区最佳模式为空气幕送风量与前室加压送风量之比为2∶1,空气幕射流速度为8 m/s,空气幕射流角度为30°。与传统正压送风防烟模式相比,防烟缓冲区最佳模式下,前室的平均CO浓度降低了99.99%,平均温度降低了98.47%,防烟缓冲最佳模式使前室加压送风量减少了1/3,楼梯间加压风量减少22.56%,节约了送竖井的地面积,减少了进入走廊和火场区的送风量,使排烟效率提高了8.76%。

Parameter Setting of the Smoke Prevention Buffer Zone Based on Orthogonal Analysis

To study the influence of the different parameter settings of the corridor -atria buffer zone on the smoke control ability of the buffer zone in a typical straight corridor of high -rise building ,this paper uses FDS (Fire Dynamics Simulator ) software to build a fire -smoke movement model of a straight corridor type high -rise building .Taking advantage of the smoke prevention buffer zone ,which is the combination of air curtain and positive pressure air supply ,this paper analyzes the influence of flow ratio ,jet angle and jet velocity of air curtain on smoke prevention ability of the buffer by using the or-thogonal design ,and concludes that the smoke prevention ability of the buffer is best when ratio of air output of air curtain to air output of atria pressurize is 2∶1 ,jet velocity of the air curtain is 8 m/s and jet angle of air curtain is 30° .Compared with the traditional positive pressure ventilation model ,the average concentration of CO in the atria decreases by 99 .99% and the average temperature decreases by 98 .47% under best mode of smoke prevention buffer zone .What’s more ,under best model of smoke prevention buffer zone ,the air output of atria pressurize decreases by 1/3 ,the air output of staircase pressurize de-creases by 22 .56% and the floor area of the air shaft is saved .In addition ,the air output into the corridor and fire area is reduced and the smoke extraction efficiency increase by 8 .76% .