中文摘要：

义章依据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20cm高度附近的连续火焰区，而且火灾全嘶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（0．2MPa）、控火水雾压力（0．4MPa）以及灭火水雾压力（0．6MPa、0．8MPa），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。

英文摘要：

A 1 ： 10 reduced-scale model test was conducted based on Froude similarity criterion to study the varia- tion of physical parameters under different operating pressures at the nozzle in the course of extinguishing a diesel oil pool fire with water mist, especially the variation law of temperature at the ceiling above the fire source, the verti- cal temperature of the fire plume, the radiation intensity of the fire zone and the longitudinal smoke temperature with or without the water mist. The results show that the maximum vertical temperature appears in the continuous flame zone at 20 cm above the fuel surface for a weak flume fire, and the fatalness of the fire is the most serious in the interim and later stages. The working pressure of the water mist at the nozzle is divided into water mist pressure without fire control （0.2 MPa）, water mist pressure with fire control （0.4 MPa） and fire-extinguishing water mist pres- sure （0.6 MPa, 0.8 MPa） based on testing and temperature data. The densities of the mixture of water vapor and smoke flowing at the tunnel crown as well as the smoke concentration are reduced under the continuous function of a water mist and fire plume. As for the longitudinal smoke temperature change at the tunnel crown, it is divided into large amplitude attenuation and steady attenuation areas. The fire plume temperature decreases obviously during fire control with the water mist, and the flame temperature is below ignition temperature after cooling.