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Modelling and simulation of the near-wall velocity of a turbulent ceiling attached plane jet after its impingement with the corner

机译：湍流天花板附着的平面射流冲击角后的近壁速度建模与仿真

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摘要

At present, ceiling-mounted diffusers are very popular for indoor air distribution, particularly in offices, owing to greater efficiency in the distribution of the air supply and a more comfortable indoor environment. The objective of this study is to construct an effective model to design the indoor airflow of an attached plane jet after its impingement with the corner in a room. In this study, a full-scale test facility was set up to obtain detailed experimental data. One commercial CFD tool, CFX 11.0, was used to simulate the air velocity distribution of an attached plane air jet bounded by the ceiling and an insulated wall. One semi-empirical model was also constructed to predict the impingement jet velocity. The results show that bout the semi-empirical model and CFX 11.0 were able to predict the maximum velocity of an impinging jet at low Reynolds numbers, 1000 and 2000, with an inaccuracy of ±11%. However, the semi-empirical model could be more conveniently used to predict the maximum jet velocity decay after its impingement the corner in a room than CFD simulation in terms of accuracy and the time required to design the indoor airflow pattern.
机译：目前，由于空气供应的分配效率更高并且室内环境更加舒适，因此天花板上安装的扩散器非常适合室内空气分配，尤其是在办公室中。这项研究的目的是构建一个有效的模型，以设计附着的平面射流撞击房间角落后的室内气流。在这项研究中，建立了一个全面的测试设施以获得详细的实验数据。使用一种商用CFD工具CFX 11.0来模拟以天花板和隔热墙为边界的附加平面空气射流的空气速度分布。还构建了一个半经验模型来预测冲击射流速度。结果表明，关于半经验模型和CFX 11.0能够在低雷诺数（1000和2000）下预测撞击射流的最大速度，其误差为±11％。但是，就设计室内气流模式所需的准确性和时间而言，半经验模型可以比CFD模拟更方便地用于预测最大射流速度撞击房间角落后的最大射流速度衰减。

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