管廊中不同横向位置线性火源温度场分布研究

为研究不同横向位置线性火源在管廊内的温度分布,将线性火源分别设置在距管廊中心0、20、40、60 cm的横向位置,开展缩尺寸管廊模型试验。研究发现,各工况的纵向温度均随时间增加先增高后降低再升高;最高温度在线性火源距中心的横向距离增大过程中先下降后升高,达到最高温度的时间也先增加后缩短;弧形管壁对火源燃烧存在一定影响;在距管廊中心0 m横向截面处的各工况均在其垂直方向上的角度达到最高温度;在距管廊中心0.5 m横向截面中,各工况最高温度对应的角度均为15°;在火源距管廊中心的横向距离增大时,-45°?45°区间的温升差距增大。

Study on temperature field distribution of linear fire source in different lateral positions in pipe gallery

In order to study the temperature distribution of the linear fire source in the pipe gallery at different lateral positions, this paper sets the linear fire source at the lateral positions of 0, 20, 40 and 60 cm from the center of the pipe gallery. The study found that the longitudinal temperature of each working condition increased first, then decreased and then increased with time. The highest temperature rise first decreases and then rises during the increase in the lateral distance of the linear fire source from the center, and the time to reach the highest temperature also increases first and then decreases. The arc-shaped tube wall has an influence on the fire source combustion. The angle in the vertical direction of each working condition at the cross section of 0 m from the center of the pipe gallery reached the highest temperature rise. In the cross section of 0.5 m transverse section, the angle corresponding to the highest temperature rise of each working condition is 15°. When the lateral distance between the fire source and the center of the pipe gallery increases, the temperature rise gap between ?45° and 45° increases.