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首页> 外文期刊>International Journal of Heat and Mass Transfer >Simulation of airflow in one- and two-room enclosures containing a fire source
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Simulation of airflow in one- and two-room enclosures containing a fire source

机译：模拟包含火源的一室和两室机柜中的气流

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In this study, the airflow in a room that contains a heat source is simulated numerically. The flow is considered turbulent and buoyant. The results of the mathematical model are validated with available experimental data at specific locations in the domain. A simple geometry is adopted, consisting of a room with a door that plays the role of both inlet-outlet for the fluid (air). At the centre of the room a methane burner is placed to serve as a heat source. The problem is simulated using two turbulence models, the well-known standard k-ε model and the RNG k-ε. model, both modified to account for buoyancy effects on turbulence. The burner is considered as a volumetric heat source. It is concluded that the fire plume development as well as the distributions of velocity and temperature are reasonably well predicted. Following this conclusion, both models are also applied to a different, more complex geometry that consisted of two rooms communicating via a door, while the heat source was placed in the first room. Unfortunately, there are no experimental data to compare with for this case, but the results appear plausible. Finally, important design factors, such as mass flow rates and neutral-plane heights, are calculated utilizing the CFD results, and are compared with those obtained by well-known empirical correlations. It is concluded that the bi-directional flow existing through the burning-room vent is similarly predicted by both turbulence models; the RNG k-ε model leading to higher, and more accurate predictions of temperature variations within the hot upper layer, at least for the single-room case.
机译：在这项研究中，对包含热源的房间中的气流进行了数值模拟。流动被认为是湍流和浮力的。数学模型的结果通过域中特定位置的可用实验数据进行验证。采用简单的几何形状，包括一个带有门的房间，该门同时充当流体（空气）的入口和出口。在房间的中央放置了一个甲烷燃烧器作为热源。使用两个湍流模型（众所周知的标准k-ε模型和RNGk-ε）对问题进行了仿真。模型，都进行了修改以考虑湍流的浮力效应。燃烧器被视为体积热源。结论是，火羽的形成以及速度和温度的分布可以合理地预测。根据这一结论，两种模型也适用于不同的，更复杂的几何形状，该几何形状由两个通过门连通的房间组成，而热源放置在第一个房间中。不幸的是，没有实验数据可与这种情况进行比较，但结果似乎是合理的。最后，利用CFD结果计算出重要的设计因素，例如质量流量和中性面高度，并将其与通过众所周知的经验相关性获得的结果进行比较。结论是，两个湍流模型都相似地预测了通过燃烧室通风口的双向流动。 RNGk-ε模型至少在单人房的情况下，可以对较高的上层温度进行更高，更准确的预测。

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