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首页> 外文期刊>International Journal of Aerodynamics >Flow and performance characteristics of a Y-shaped diffusing duct using CFD
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Flow and performance characteristics of a Y-shaped diffusing duct using CFD

机译：使用CFD的Y形扩散管的流动和性能特征

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A computational investigation is carried out to study the flow and performance characteristics of a Y-shaped diffusing duct having two inlets and one outlet with an overall area ratio of 2 using a commercial CFD code, FLUENT. The CFD code is validated with the experimental results and it was found that the code applying the RNG k-e turbulence model has the capability of predicting the flow and performance characteristics for the similar geometry. The Y-shaped diffusing duct is formed by merging two symmetrical S-shaped diffusing ducts (area ratio = 4, curvilinear length = 600 mm, angle of turn = 22.5722.5°) at the centreline of outlet. The flow and performance characteristics of the duct are analysed for a uniform flow profile at the inlet that is observed in the experiments. The results are presented in the form of contour plots for the axial velocity distribution and the cross-flow velocity distribution in terms of vector plots. The analysis reveals the fact that however the flow at the diffuser inlet is uniform, secondary flows are induced as an effect of curvature and change in the cross-sectional area.
机译：使用商业CFD代码FLUENT进行了计算研究，以研究Y形扩散管的流动和性能特征，该扩散管具有两个入口和一个出口，总面积比为2。实验结果验证了CFD代码的有效性，发现使用RNG k-e湍流模型的代码具有预测相似几何形状的流量和性能特征的能力。 Y形扩散管是通过在出口中心线处合并两个对称的S形扩散管（面积比= 4，曲线长度= 600 mm，转角= 22.5722.5°）形成的。分析管道的流量和性能特征，以在实验中观察到入口处的流量均匀分布。结果以等高线图的形式表示，用于矢量速度的轴向速度分布和错流速度分布。该分析揭示了以下事实：尽管扩散器入口处的流量是均匀的，但是由于曲率和横截面积的变化而引起二次流量。

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