Study on salt water modeling of gravity currents prior to backdrafts using flow visualization and digital particle image velocimetry
Study on salt water modeling of gravity currents prior to backdrafts using flow visualization and digital particle image velocimetry
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利用流动可视化和数字粒子图像测速技术研究逆流前重力流的盐水模型
DOI：
10.1007/s00348-002-0448-1
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发表时间：
2002
影响因子：
2.4
通讯作者：
L. Yang
中科院分区：
文献类型：
--
作者：
W. Weng;W. Fan;J. Qin;L. Yang
为了研究建筑物火灾中回流前重力流混合区的速度和清晰度，采用流动可视化和数字粒子图像测速技术进行了一系列缩比盐水实验。按比例的隔间（0.4 m×0.1 m×0.1 m）分别配有各种端部和天花板开口几何形状：全槽、中槽、上槽、下槽、门和窗。实验结果表明，盐水实验中的重力流与其他自然发生的重力流相似。该实验可以模拟建筑火灾中回燃前的重力流，并预测具有相同开口几何形状的隔间中回燃的着火时间。
In order to investigate the speed and clarity of the extent of the mixed region of gravity currents prior to backdrafts in building fires, a series of scaled salt water experiments using flow visualization and digital particle image velocimetry were conducted. The scaled compartment (0.4 m×0.1 m×0.1 m) was fitted with a variety of end and ceiling opening geometries, respectively: full, middle-slot, upside-slot, downside-slot, door and window. The experimental results show that the gravity currents in salt water experiments are similar to other naturally occurring gravity currents. And the experiments can model the gravity currents prior to backdrafts in building fires and predict the time of ignition for backdrafts in compartments with the same opening geometries.