摘要
采用Pyro Sim建立模型进行FDS数值模拟,得到隧道不同坡度段在不同通风速度下发生火灾后的纵向断面温度分布和烟气流动情况,分析得出:在相同的通风速度下,上坡坡度越大或下坡坡度越小,烟气越易向火源下游排出,越利于减小烟气回流距离;若通风速度增加所引起火源处单位时间内随烟气往下游排出热量的增加量为?Q1,而通风速度增加引起火源处单位时间内烟气向上游的回流程度减小所致单位时间随烟气向上游扩散热量的减少量为?Q2,则当?Q1<?Q2时,火源附近平均温度上升,当?Q1>?Q2时,火源附近平均温度下降;拟合得出5%下坡段隧道的烟气回流长度与通风速度的关系式。
Temperature distribution of vertical section and smoke flow when ventilation is at critical velocity and different ventilation velocity in different slope fire tunnel were obtained by building model and making numerical simulation with PyroSim software. Conclusions are summarized as follows： at the same ventilation speed, the bigger the slope of ascent is or the smaller the slope of downgrade is, the easier smoke exhaust downstream and the shorter smoke reflux distance is. The unit time increased heat exhausted to outside with smoke downstream near the fire source caused by increased ventilation speed is denoted as △Q1 and the unit time decreased heat spread upstream with smoke near the fire source caused by increased ventilation speed is denoted as △Q2. If △Q1 〈△Q2, the average temperature near the fire source will rise. And if△Q1 〉△Q2, the average temperature near the fire source will drop; Obtained the relationship between reflux distance and ventilation speed of downgrade tunnel with a slope of 5% by fitting to simulated data.
出处
《制冷与空调（四川）》
2015年第5期601-605,共5页
Refrigeration and Air Conditioning
关键词
隧道火灾
数值模拟
坡度
烟气回流
临界风速
温度
Tunnel fire
Numerical simulation
Slope
Smoke reflux
Critical wind velocity
Temperature
作者简介
王松（1988．09-），男，在读硕士研究生，E-mail：forgetpanda@qq．com
通讯作者：王子云（1972．11-），男，博士，副教授，E-mail：wzyfirst@163．com
