不同坡度下地下环形受限空间烟气羽流扩散规律
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摘要
以某典型地下环形隧道为例,结合数值模拟、理论分析研究不同坡度、不同火源位置等共同作用下地下环形隧道烟气羽流扩散规律。定量分析3个火灾场景下(火源位于隧道主干隧道、出入口支路隧道、交叉路口隧道),不同坡度(0隧道坡度、3%隧道坡度、5%隧道坡度)隧道内温度、烟气高度、能见度分布情况。研究表明:隧道坡度越大冷空气卷吸越强烈,烟气降温越快,烟气沉降速度越快;隧道坡度导致隧道内温度场出现明显的单向发展规律。
Taken a typical underground tunnel in Chengdu as an example, the effects of different slopes and different fire source locations on the diffusion of smoke plumes in underground ring tunnels were investigated through numerical simulation and theoretical analysis. This paper analyzed the distribution of temperature,smoke height and visibility of underground circular tunnels quantitatively under three fire scenarios with different fire locations including main tunnel, exit branch tunnel and intersection tunnel and with different slopes including 0, 3% and 5%. The results showed that the greater the slope of the tunnel, the stronger the cold air entrainment and the faster the flue gas cooling and the faster the settling velocity of the flue gas. Tunnel slope leads to obvious oneway development of the temperature field inside the tunnel.
Taken a typical underground tunnel in Chengdu as an example, the effects of different slopes and different fire source locations on the diffusion of smoke plumes in underground ring tunnels were investigated through numerical simulation and theoretical analysis. This paper analyzed the distribution of temperature,smoke height and visibility of underground circular tunnels quantitatively under three fire scenarios with different fire locations including main tunnel, exit branch tunnel and intersection tunnel and with different slopes including 0, 3% and 5%. The results showed that the greater the slope of the tunnel, the stronger the cold air entrainment and the faster the flue gas cooling and the faster the settling velocity of the flue gas. Tunnel slope leads to obvious oneway development of the temperature field inside the tunnel.
引文
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[13]周庆,倪天晓,周湘川.纵向通风下坡度隧道火灾烟气特性数值模拟研究[J].中国安全科学学报,2011,21(3):42-47.
[2] CARVEL R. The history and future of fire tests[J]. Tunnels&Tunnelling International,2002,(11):34-35.
[3]赵望达,李洪.坡度对隧道火灾影响的数值模拟研究[J].消防科学与技术,2009,28(2):83-86.
[4] OKA Y, ATKINSON G T.Control of smoke flow in tunnel fires[J].Fire Safety Journal,1995,(25):305-322.
[5]冯凯,许秦坤.坡度对施工中隧道火灾烟气流动性影响分析[J].消防科学与技术,2015,34(1):41-45.
[6] GOX G, CHITTY R, KUMAR S. Fire model and the king’s cross fire investigation[J]. Fire Safty Journnal,1989,15(1):103-106.
[7]卢平,丛北华,廖光煊,等.纵向通风水平隧道火灾烟气流动特性研究[J].中国工程科学,2004,6(10):59-64.
[8]赵相相,周孝清,张燕,等.地铁隧道火灾烟气特性与临界风速的数值模拟分析[J].暖通空调,2005,35(12):68-72.
[9]张娜,戴国平,郭光玲,等.坡度隧道中烟气控制的CFD模拟研究[J].公路,2005,5(5):180-182.
[10]黄洋,张英,陈先锋,等.基于CFD坡度隧道火灾烟气蔓延特性模拟研究[J].工业安全与环保,2016,42(2):33-36.
[11]李炎锋,王红艺,赵明星,等.有坡度隧道火灾温度场分布规律研究[J].消防科学与技术,2016,35(12):1677-1679.
[12]黄鹏,韩新.大断面公路隧道火灾烟气分布与通风风速特性研究[J].武警学院学报,2007,23(10):8-10.
[13]周庆,倪天晓,周湘川.纵向通风下坡度隧道火灾烟气特性数值模拟研究[J].中国安全科学学报,2011,21(3):42-47.