Flow Behavior of Ejected Fire Flame and Plume from an Opening effect by External Side Wind

为了解外部侧风对火焰/羽流流动行为的影响，进行了一项缩小规模的实验研究，该火焰/羽流是从防火室内开口喷出的。以0.06米/秒到1.88米/秒的不同速度向火焰/羽流施加外侧风。在垂直和水平方向上，系统地测量了火焰/羽流和热流中火焰/羽流的向上速度和温度。等速和温度等值线给出了轨迹的位置(主流轴的轨迹)，最有可能出现的最高上升速度和最高温度沿轨迹观察到的温度和垂直方向上的上升速度的下降模式与直线火源在流动中的行为相似。根据实验数据估算了侧风作用下弹道的倾斜度和倾斜度。基于侧向风的浮力和惯性力的平衡以及开口的长宽比和放热率的平衡，无因次放热率、弗劳德数和开口的展宽比的耦合函数可以描述轨迹斜率(或火焰倾斜率)的简化模型。

A reduced-scale experimental study was carried out to collect a knowledge of the effect of external side wind on the flow behavior of a flame/plume which is ejected from an opening of a fire compartment. The external side wind was given to the flame/plume at the various speeds of 0.06m/sec to 1.88m/sec. Upward velocities and temperatures of the flame/plume and in the hot current were measured systematically along the wall for vertical and horizontal directions. The equivelocity and temperature contours gave the location of the trajectory (trace of main flow axis) as the highest possibility of the appearance where highest upward velocity and temperature observed Decreasing modes of the temperature and upward velocity for vertical direction along the trajectory showed similar behaviors of those obtained in the flow from a line fire source. The slope of the trajectory inclined by side wind and of which slope was estimated based on the experimental data. A simplified model on the trajectory slope (or flame inclination slope) can be described by the coupled function of dimensionless heat release rate, Froude number and the aspect ratio of the opening base on the balance of buoyancy and inertia force of side wind as well as the aspect ratio of the opening and heat release rate.