正压送风-气幕联合防烟系统数值模拟

Numerical study on united smoke-prevention system of pressurization air supply and air curtain

提出了正压送风-气幕联合防烟系统,以提高防烟楼梯间的防烟效果,减少系统总送风量。利用FDS模拟研究了气幕送风速率、送风角度对联合防烟系统总送风量的影响规律。结果表明,气幕的最佳设置参数为送风速率7m/s,气幕送风口向烟气区偏转25°;在最佳气幕设置参数下,当开启门数量为两扇时,联合防烟系统的总送风量为独立正压送风防烟系统送风量的50%～60%;在相同的有效送风量下,应用联合防烟系统进行楼梯间防烟时,可开启疏散门数量为应用正压送风防烟系统时的3～4倍。

A united smoke prevention system of pressurization air supply and air curtain was put forward,to improve the smoke prevention effectiveness and reduce the total air supply volume.By FDS,the effect of air curtain outlet rate and jet angle on the total air supply volume were studied.The results show that the optimal air curtain outlet rate is 7m/s,and the optimal jet angle is 25° leaning to the smoke area.With the optimal outlet rate and angle of air curtain,the total air supply volume rate of united system will reduce to 50%～60% compare with single positive pressure mechanical air supply system when 2 doors are opened.With the same total air supply,the opened door number using united system could be 3～4 times to using single positive pressure mechanical air supply system.