纵向通风下隧道内重石脑油燃烧温度分布与火焰倾角研究

搭建了1:10的缩尺寸隧道模型，考虑不同火源功率和纵向风速开展了纵向通风下隧道内重石脑油燃烧的试验研究，测量了隧道内顶棚下方纵向温度分布，并量化了火焰的倾斜角度。结果表明：随着纵向通风风速的增加，隧道内温度整体呈降低趋势，顶棚下方最高温度逐渐减小，进而提出了纵向通风下隧道内重石脑油燃烧时顶棚下方最高温度的估算模型。火焰倾斜角度随纵向风速的增加而呈增加趋势。当纵向风速较低（小于1 m/s）时，随着纵向风速的增加火焰倾斜角度明显增大；当纵向风速较大（大于1 m/s）时，纵向风速对火焰倾斜角度的影响不明显。

Study on temperature distribution and flame angle of heavy naphtha combustion in tunnel under longitudinal ventilation

Experimental study of heavy naphtha combustion in tunnel under longitudinal ventilation was carried out in 1:10 reduced size tunnel model considering different fire heat release rates and longitudinal ventilation velocities. The longitudinal temperature distribution under the tunnel ceiling was measured, and the inclination angle of the flame was quantified. The results show that with the increase of longitudinal ventilation velocity, the temperature in the tunnel decreases as a whole, and the maximum temperature under the ceiling decreases gradually. Then an estimation model of the maximum temperature under the ceiling during heavy naphtha combustion in the tunnel under longitudinal ventilation is proposed. The inclination angle of flame increases with the increase of longitudinal ventilation velocity. When the longitudinal wind velocity is low (less than 1 m/s), the flame inclination angle increases obviously with the increase of longitudinal ventilation velocity. When the longitudinal wind velocity is faster (more than 1 m/s), the influence of the longitudinal ventilation velocity on the flame inclination angle is not obvious.