A simple plume model induced by stack effect in a vertical shaft

中国工程科学 ›› 2009, Vol. 11 ›› Issue (3) : 35 -41.

Zhang Jingyan1, Lu Weizhen2 , Huo Ran3

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A simple plume model induced by stack effect in a vertical shaft

Zhang Jingyan1, Lu Weizhen2 , Huo Ran3

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摘要

通过比较烟囱效应诱导羽流与阳台溢流的形成机理，利用理论分析和一系列全尺寸实验，得到了烟囱效应诱导倾斜羽流轮廓的简化模型。结果显示：羽流轮廓两侧呈现轴对称分布，并且羽流半径与羽流高度近似成线性关系。烟囱效应诱导羽流轮廓和风洞中的倾斜羽流轮廓相似，火焰倾斜角度介于50～60度之间。

Abstract

After comparing the mechanism of tilted plume under stack effect with that of spill plume, the tilted plume model induced by stack effect in a vertical shaft is developed simply based on the theoretical results and a series of fullscale tests. It is shown that the two sides of plume are symmetrical and have an accordant regulation that the plume radius has a linear relation to the height z. The profile of fire plume under stack effect is similar to the windblown flame in wind tunnel, and the range of flame deflection angle is about from 50 to 60 degree.