大断面隧道水雾抑制熄灭柴油池火的试验研究

发布时间：2018-11-27 14:46

【摘要】：文章依据Froude相似准则开展1:10缩小尺寸模型试验,研究了不同喷嘴压力下水雾抑制熄灭柴油池火过程中的物理参数变化规律,重点分析了有,无水雾作用下火源上方顶棚处温度、火羽流竖向温度、火区辐射强度以及纵向烟气温度变化规律。结果表明:弱羽流火灾竖向最高温度出现在燃料表面上方20 cm高度附近的连续火焰区,而且火灾全面发展阶段中期至后期隧道火灾危险性最大;依据试验现象及温度数据,将水雾喷嘴工作压力分为非控火水雾压力(0.2 MPa)、控火水雾压力(0.4 MPa)以及灭火水雾压力(0.6 MPa、0.8 MPa),水雾与火羽流持续作用时隧道顶部流动的水汽烟气混合物及隧道整体烟气浓度降低;隧道顶部烟气温度纵向变化可分为大幅度衰减区以及平稳衰减区;水雾控火作用下火羽流降温明显且冷却后火焰温度低于燃点温度。
[Abstract]:In this paper, the 1:10 reduction model test is carried out according to the Froude similarity criterion, and the variation of physical parameters in the process of water mist suppression and extinguishing diesel pool fire under different nozzle pressures is studied, with emphasis on the analysis of the following. Under the action of no water mist, the temperature of the roof above the fire source, the vertical temperature of the fire plume, the radiation intensity of the fire area and the variation of the longitudinal flue gas temperature were studied. The results show that the vertical maximum temperature of the weak plume fire occurs in the continuous flame zone near the height of 20 cm above the fuel surface, and the tunnel fire risk is the greatest in the middle to late stages of the fire development stage. According to the experimental phenomena and temperature data, the working pressure of the water mist nozzle is divided into two categories: the uncontrollable water mist pressure (0. 2 MPa),) and the fire control water mist pressure (0. 4 MPa) and the fire extinguishing water mist pressure (0. 6 MPa,0.8 MPa),). When the water mist and fire plume continue to interact, the mixture of water vapor and flue gas at the top of the tunnel and the whole smoke concentration of the tunnel are decreased. The longitudinal variation of flue gas temperature at the top of the tunnel can be divided into large attenuation region and steady attenuation zone, and the flame temperature is lower than the ignition point temperature after cooling under the action of water mist fire control.
【作者单位】：西南交通大学交通运输与物流学院;西南交通大学地球科学与环境工程学院;
【基金】：国家自然科学基金资助项目(51008251) 中央高校基本科研业务费专项资金资助项目(SWJTU12BR013)
【分类号】：U458

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