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首页> 外文期刊>Building and Environment >A comparison of three turbulence models for the prediction of parallel lobed jets in perforated panel optimization
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A comparison of three turbulence models for the prediction of parallel lobed jets in perforated panel optimization

机译：三种湍流模型在多孔板优化中预测平行叶片射流的比较

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摘要

The general context of the present study is the design of high induction HVAC air diffusers by means of passive jet control. When the diffuser is a perforated panel with lobed orifices (Meslem et al. 2010), the optimization of jet induction consists in improving the orifice's geometry, the spacing between orifices and their arrangement on the panel. In this study, the flow field of a turbulent twin cross-shaped jet is investigated numerically using the standard k-e model, the Shear Stress Transport (SST) k-ω model and the Reynolds Stress Model (RSM). The results are compared with PIV measurements. The objective is to assess their capability and limitations to predict the significant features of twin jet flow when the flow is numerically resolved through a lobed diffuser. It is shown that the k-e and RSM models are more appropriate for predicting potential jet core length, the change in jet centreline streamwise velocity, and flow expansion in the symmetry plane of the twin jet flow. However, these models overestimate the overall flow expansion and the jet volumetric flow rate. The SST k-ω model seems more appropriate for the prediction of such dynamic integral quantities. A high level of turbulent kinetic energy predicted by the k-ε and RSM models in the near field of jets is probably the reason for this overestimation of jet induction. The SST k-ω model would appear to be the most appropriate tool for optimizing orifice design, orifice to orifice spacing and relative orifice orientation on a perforated panel diffuser.
机译：本研究的总体背景是通过被动射流控制设计高感应HVAC空气扩散器。当扩压器是带有裂孔的多孔板时（Meslem等人，2010年），射流诱导的优化在于改善孔的几何形状，孔之间的间距及其在板上的布置。在这项研究中，使用标准k-e模型，剪切应力传递（SST）k-ω模型和雷诺应力模型（RSM）对湍流双十字形射流的流场进行了数值研究。将结果与PIV测量值进行比较。目的是评估当流量通过叶片扩散器数值分解时预测双股射流显着特征的能力和局限性。结果表明，k-e和RSM模型更适合于预测潜在的射流芯长度，射流中心线流向速度的变化以及双股射流对称面上的流动扩展。但是，这些模型高估了总体流量膨胀和射流体积流量。 SSTk-ω模型似乎更适合于预测此类动态积分量。 k-ε和RSM模型在射流近场中预测的高水平湍动能可能是这种高估射流感应的原因。 SSTk-ω模型似乎是最合适的工具，可用于优化孔板设计，孔到孔的间距以及穿孔板扩散器上的相对孔方向。

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  • 来源
    《Building and Environment》 |2011年第11期|p.2203-2219|共17页
  • 作者

    Amina Meslem; Aliou Dia; Claudine Beghein; Mouhammad El Hassan; Ilinca Nastase; Pierre-Jean Vialle;

  • 作者单位

    LEPTIAB, University of La Rochelle, Pole Sciences et Technologie, Avenue Michel Crepeau, 17042 La Rochelle, France;

    LEPTIAB, University of La Rochelle, Pole Sciences et Technologie, Avenue Michel Crepeau, 17042 La Rochelle, France;

    LEPTIAB, University of La Rochelle, Pole Sciences et Technologie, Avenue Michel Crepeau, 17042 La Rochelle, France;

    LEPTIAB, University of La Rochelle, Pole Sciences et Technologie, Avenue Michel Crepeau, 17042 La Rochelle, France;

    Technical University of Construction in Bucharest, Building Services Department, 66 Avenue Pache Protopopescu, 020396 Bucharest, Romania;

    CIAT Research and Development Center, Culoz, France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    hvac; parallel jets; lobed jet; piv measurements; numerical simulation;

    机译：暖通空调;平行射流;裂叶射流;视变测量;

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