Numerical Simulations of Strong-Plume Driven Ceiling Flows

P. Chatterjee, K. Meredith, B. Ditch, H. Z. Yu, Yi Wang, F. Tamanini
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引用次数: 10

Abstract

Large eddy simulations (LES) of ceiling flow driven by strong-plumes of rack-storage fires have been simulated for a range of convective heat release rates (HRR) and ceiling heights. An actual delivered density (ADD) apparatus plume generator burner setup has been modeled using buoyant diffusion flames and with the inclusion of an upstream airflow vent producing the higher plume velocities observed in rack-storage fires. Computed results for plume centerline excess temperature and velocity have been compared against experimental data. In addition to the modeled burner setup, an alternate volumetric HRR source has also been applied in the simulations. Flows under ceilings located at different heights above the ADD apparatus have been simulated. Various convective HRR plumes have been used and the resulting ceiling flow radial distributions of computed excess temperature and velocity have been compared against experimental measurements. Predicted temperature and radial velocity profiles have also been shown to agree favorably with experimental data at two depths below the ceiling heights. Comparison of ceiling layer depths have also shown good comparison with an empirical correlation.
强羽流驱动天花板流动的数值模拟
在一定的对流放热率(HRR)和顶棚高度范围内,对强羽流驱动的顶棚流动进行了大涡模拟。一种实际传递密度(ADD)装置羽流发生器燃烧器装置使用浮力扩散火焰进行建模,并包含一个上游气流通风口,产生在架子储存火灾中观察到的更高的羽流速度。计算结果与实验数据进行了比较。除了模拟燃烧器设置外,还在模拟中应用了备用容积HRR源。在ADD设备上方不同高度的天花板下进行了流动模拟。使用了不同的对流HRR羽流,并将计算得到的过量温度和速度的上限流径向分布与实验测量结果进行了比较。预测的温度和径向速度分布也显示与天花板高度以下两个深度的实验数据吻合良好。顶棚层深度的比较也显示出与经验相关性的良好对比。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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