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Numerical investigation of the flow behavior of an isothermal impinging jet in a room

机译：室内等温射流流动特性的数值研究

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摘要

The impinging jet concept has been proposed as a new ventilation strategy for use in office and industrial buildings. The present paper reports the mean flow field behavior of an isothermal turbulent impinging jet in a room. The detailed experimental study is carried out to validate the numerical simulations, and the predictions are performed by means of the RNG k-ε and SST k-ω model. The comparisons between the predictive results and the experimental data reveal that both of the tested turbulence models are capable of capturing the main qualitative flow features satisfactorily. However, it is worth to mention that the predictions from the RNG k-ε model predicts slightly better of the maximum velocity decay as jet approaching the floor, while the SST k-ω model accords slightly better in the region close to the impingement zone which is crucial for spreading of the jet inside the room. Another important perspective of this study is to investigate the influence of different flow and configuration parameters such as jet discharge height, diffuser geometry, supply airflow rate and confinement from the surrounding environment on the impinging jet flow field with the validated model. The obtained data are presented in terms of the jet dimensionless velocity distribution, maximum velocity decay and spreading rate along the centerline of the floor. The comparative results demonstrate that all the investigated parameters have certain effects on the studied flow features, and the diffuser geometry is found to have the most appreciable impact, while the supply airflow rate is found to have marginal influence within the moderate flow range.
机译：撞击射流的概念已被提议作为办公和工业建筑中使用的一种新的通风策略。本文报道了室内等温湍流冲击射流的平均流场特性。进行了详细的实验研究以验证数值模拟，并通过RNGk-ε和SSTk-ω模型进行了预测。预测结果与实验数据之间的比较表明，两个测试的湍流模型均能够令人满意地捕获主要的定性流动特征。但是，值得一提的是，RNGk-ε模型的预测结果表明，随着射流接近地面，最大速度衰减会稍好一些，而SSTk-ω模型在靠近撞击区域的区域则稍好一些。对于在室内传播喷气机至关重要。这项研究的另一个重要观点是，使用经过验证的模型来研究不同流量和配置参数（如射流排放高度，扩散器几何形状，送风量和周围环境的限制）对撞击射流场的影响。所获得的数据以射流的无量纲速度分布，最大速度衰减和沿地板中心线的扩散速率表示。比较结果表明，所有研究的参数对所研究的流量特性都有一定的影响，并且发现扩散器的几何形状具有最明显的影响，而发现送风量在中等流量范围内具有边际影响。

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  • 来源
    《Building and Environment》 |2012年第3期|p.154-166|共13页
  • 作者

    H.J. Chen; B. Moshfegh; M. Cehlin;

  • 作者单位

    Department of Building, Energy and Environmental Engineering, Faculty of Engineering and Sustainable Development, University of Gavle, 801 76 Gavle, Sweden,Division of Energy Systems, Department of Management and Engineering, Linkoeping University, Linkoeping, Sweden;

    Department of Building, Energy and Environmental Engineering, Faculty of Engineering and Sustainable Development, University of Gavle, 801 76 Gavle, Sweden,Division of Energy Systems, Department of Management and Engineering, Linkoeping University, Linkoeping, Sweden;

    Department of Building, Energy and Environmental Engineering, Faculty of Engineering and Sustainable Development, University of Gavle, 801 76 Gavle, Sweden;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    impinging jet ventilation; measurement; numerical simulation; parametric study;

    机译：阻碍射流通风;测量;数值模拟参数研究;

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