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为探明胶带巷火灾蔓延及烟气的流动规律,以美国职业安全与卫生研究所进行的一组全尺寸巷道火灾试验为背景,应用数值模拟技术,结合输送带燃烧特性,建立火焰在输送带上传播的数值模型并验证模型的有效性,重点研究火源功率在2和4 MW条件下,风速在0.5~4 m/s范围内,输送带平均延燃速率和近火源区巷道内部温度分布。结果表明:风速对输送带的初始延燃速率有较大影响,火源功率对火焰在输送带上蔓延距离影响显著,火灾平均蔓延速率与风速呈正相关关系,巷道纵向方向温度分布规律受风速影响表现不同,顶棚附近温度随风速增加而降低,距底板1.5 m高度处温度随风速增加而升高。
In order to detect the spread of fire and the flue gas flow in the adhesive tape lane, taking a series of full-scale tunnel fire tests conducted by the Institute of Occupational Safety and Health of the United States as the background, numerical simulation technology and combustion characteristics of the conveyor belt were used to establish the flame- On the numerical model of the propagation and verify the validity of the model, focusing on the study of the power of the fire source in 2 and 4 MW conditions, the wind speed in the range of 0.5 ~ 4 m / s, the average delay rate of the conveyor belt and the near-source zone roadway interior temperature distributed. The results show that the wind speed has a significant influence on the initial ignition delay rate of the conveyor belt. The power of the ignition source has a significant effect on the spread of the flame on the conveyor belt. The average fire spread rate has a positive correlation with the wind speed. The longitudinal temperature distribution in the roadway is affected by the wind speed The performance is different, the temperature near the ceiling decreases with the increase of wind speed, and the temperature increases with the increase of wind speed at the height of 1.5 m from the floor.