单洞对向公路隧道火灾烟气模糊控制

为解决公路隧道火灾烟气对人员的影响, 以单洞对向交通隧道火灾为基础, 建立火灾数值计算模型。在火灾烟气控制中引入模糊控制理论, 模拟烟雾在隧道内两组射流风机之间200 m的区间内往复运动, 通过改变射流风机的风速和方向, 分析在时间为180、360 s内, 风速为1.0、1.5 m.s-1的火灾烟雾扩散情况, 研究了控制区域内烟气的分布和影响规律。计算结果表明: 在火灾点两侧分别开启射流风机, 间歇为30 s、风速为1.0 m.s-1的运行烟气属于小振幅运动, 烟雾基本控制在火源点左右两侧50~80 m的位置; 间歇为60 s、风速为1.5 m.s-1的运行烟气属于大振幅运动, 烟雾基本控制在火源点左右两侧80~100 m的位置; 烟气小振幅运动要优于大振幅运动。

Fuzzy control of fire smoke in single highway tunnel with subtended traffic

In order to eliminate the influence of fire smoke on people in single highway tunnel with subtended traffic, a fire numerical calculation model was established.The theory of fuzzy control was introduced into the control of fire smoke, and the reciprocating motion of smoke in the area of 200 m between two groups of jet fans in the tunnel was simulated.By changing the wind velocities and directions of jet fans in tunnel, the distribution and influence law of smoke within the control area were studied when smoke diffusion times were 180 and 360 s, and wind velocities were 1.0 and 1.5 m·s-1.Calculation result shows that after jet fans on both sides of fire source are started respectively, the smoke is basically controlled at the positions of 50-80 m on both sides of fire source, and its motion belongs to small amplitude motion when the start interval of jet fans is 30 s and wind velocity is 1.0 m·s-1.When the interval is 60 s and the speed is 1.5 m·s-1, the smoke is basically controlled at the positions of 80-100 m, and its motion is large amplitude motion.The small amplitude motion is superior to large amplitude motion.