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Transient natural ventilation of a space with localised heating

机译：局部加热的空间的瞬时自然通风

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The natural ventilation of a well mixed, pre-heated room with a point source of heating, and openings at the base and roof is investigated. The transient draining associated with the room being warmer than the exterior combined with the convective flow produced by the point source of heat leads to a fascinating series of transient flow regimes as the system evolves to the two-layer steady-state regime described by Linden, Lane-Serff and Smeed [1]. As the room begins to ventilate, a turbulent plume rises from the point source of heat to the ceiling, and typically forms a deepening layer of hot air. However, with a weak heat source, then at some point the ascending plume will intrude beneath the layer of original fluid. Otherwise, the ascending plume always reaches the top of the room as the system evolves to a steady state. We develop a simplified model of the transient evolution and test this with some new laboratory experiments. We conclude with a discussion of the implications of our results for real buildings.
机译：研究了混合好的，预热的房间的自然通风情况，该房间带有点加热源，底部和屋顶都有开口。随着系统发展到由Linden所描述的两层稳态状态，与房间温度比外部温度高的房间相关的瞬态排水以及点热源产生的对流会导致一系列令人着迷的瞬态流态。 Lane-Serff和Smeed [1]。当房间开始通风时，湍急的烟羽从点热源升至天花板，并通常形成加深的热空气层。但是，在热源较弱的情况下，上升的羽流将在某些时候侵入原始流体层的下方。否则，随着系统发展到稳定状态，上升的羽流始终会到达房间的顶部。我们开发了瞬态演化的简化模型，并通过一些新的实验室实验对此进行了测试。最后，我们讨论了结果对实际建筑物的影响。

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