| 温度层化环境中线羽流的流动特性 |
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| 引用本文： | 李俊梅,张仁,李炎锋,赵宇航,田洋.温度层化环境中线羽流的流动特性[J].北京工业大学学报,2017,43(1). |
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| 作者姓名： | 李俊梅 张仁 李炎锋 赵宇航 田洋 |
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| 作者单位： | 北京工业大学北京城市交通协同创新中心，北京 100124;北京工业大学建筑工程学院，北京 100124;北京工业大学北京城市交通协同创新中心,北京,100124 |
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| 基金项目： | 北京市自然科学基金-北京市科学技术研究院联合资助项目，国家自然科学基金资助项目 |
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| 摘 要： | 为研究层化环境对内部火灾烟气扩散的影响,以线羽流为研究对象,在正常环境下线羽流流动特性研究的基础上,通过理论分析对恒温度梯度环境中线羽流的流动特性进行了分析研究,得到线羽流的扩散半径、轴心速度、轴心密度差随高度的变化规律,线羽流所能达到的最大高度,烟气浮力发生变化的临界高度等.
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| 关 键 词： | 温度层化环境 线羽流 热动力特性 |
Oretical Analysis on the Dynamics of Line Plume in Thermal-stratified Environment |
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| LI Junmei,ZHANG Ren,LI Yanfeng,ZHAO Yuhang,TIAN Yang.Oretical Analysis on the Dynamics of Line Plume in Thermal-stratified Environment[J].Journal of Beijing Polytechnic University,2017,43(1). |
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| Authors: | LI Junmei ZHANG Ren LI Yanfeng ZHAO Yuhang TIAN Yang |
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| Abstract: | Thermal-stratified environment is often seen in atria or other large space buildings with glass roofs due to the solar radiation. In order to study the effect of the thermal-stratified environment on the smoke spread in fire cases, theoretical analysis of the thermal dynamics of the line plume in the environment with constant vertical temperature gradient was carried out based on the former research in this paper. Variations of the radius, central velocity, density difference of the line plume with height were derived, and the maximum height of the plume was obtained. The upward buoyancy due to the line source changed its direction at the height of 76% of the maximum height which the plume could rise. |
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| Keywords: | thermal-stratified environment line plume thermal dynamics |
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