加压送风口设置对前室烟气控制效果的影响研究

Study on the effect of setting of pressurized air supply outlet on the smoke control effect in vestibule

GB 51251-2017《建筑防烟排烟系统技术标准》第3.1.3条第2款对前室机械加压送风口设置作了严格要求,为了研究加压送风口不同设置方式对前室防烟效果的影响,以采用机械加压送风防烟形式的单入口独立前室为研究对象,借助PyroSim分别对前室加压送风口的位置、送风角度和送风口布置方式对前室门洞断面风速和前室烟气流动的影响进行了模拟研究。结果表明:送风口设置在前室门正上方时防烟效果最好,其次是在正对前室门的位置;合适的送风角度能够将送风气流引向前室门以改善防烟效果;正对前室门设置送风口时横向布置比竖向布置防烟效果更好。

Article 3.1.1(2)of Technical standard for smoke management systems in buildings stipulates strict requirements for the mechanical pressurized air supply outlet settings in the vestibule.In order to study the effect of different setting methods of pressurized air supply outlet on the wind speed of the vestibule doorway section and the smoke prevention,this paper took a single entrance independent vestibule which adopts pressurization air supply to prevent smoke as research project,PyroSim was used to simulate the wind speed of the vestibule doorway section and the smoke flow in the vestibule under different settings of pressurized air outlets locations,air supply angles and arrangements of outlets.The results show that the effect of smoke prevent in the vestibule is the best when the air supply outlet is set above the door of vestibule,followed by the location opposite the vestibule door.Setting the air supply angle to lead the air to the vestibule door will improve the smoke prevention effect.When the outlet is set opposite the vestibule door,the horizontal arrangement is better than the vertical arrangement.