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首页> 外文会议>ASME(American Society of Mechanical Engineers) Turbo Expo vol.4 pt.A; 20070514-17; Montreal(CA) >RANS EVALUATIONS OF INTERNAL COOLING PASSAGE GEOMETRIES: RIBBED PASSAGES AND A 180 DEGREE BEND
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RANS EVALUATIONS OF INTERNAL COOLING PASSAGE GEOMETRIES: RIBBED PASSAGES AND A 180 DEGREE BEND

机译：内部冷却通道几何图形的RANS评价：带肋通道和180度弯曲

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摘要

A comprehensive study and assessment of RANS based turbulence models is performed on internal cooling duct passages of turbine blades. Conjugate computational heat transfer studies of 90 and 45 degree turbulated ducts are performed and compared to experimental data from the Von Karmon Institute. Spatially resolved Nusselt number distributions are computed using CFX in conjunction with several RANS based turbulence models. In addition, similar computational studies of a 180 degree turnaround bend are performed and compared to experimental data from Arizona State University. In that experiment, area averaged Nusselt numbers are provided at different locations throughout a 180 degree turn around bend. For both analyses, the experimental data sets are carefully chosen as the original authors/experimentalists clearly identified the geometry and boundary conditions such that there was no ambiguity for CFD analysis. For the 90 degree turbulator orientation, it was found that most two equation models largely under predicted heat transfer levels. For the 45 degree turbulator configuration, it was found that a new SST based turbulence formulation, provided by CFX, adequately matched the experimental data. For the 180 degree turnaround bend, Nusselt numbers were well predicted by this new formulation. For all geometries analyzed, resorting to a particular higher moment closure model inside of CFX provided no extra benefit in terms of accuracy.
机译：对基于RANS的湍流模型进行了全面的研究和评估，并对涡轮机叶片的内部冷却通道进行了评估。进行了90度和45度湍流管的共轭计算传热研究，并将其与冯·卡蒙研究所的实验数据进行了比较。使用CFX结合几个基于RANS的湍流模型来计算空间分辨的Nusselt数分布。此外，进行了类似的180度转弯弯曲计算研究，并将其与亚利桑那州立大学的实验数据进行了比较。在该实验中，在整个180度转弯弯曲过程中，在不同位置提供了面积平均Nusselt数。对于这两种分析，都仔细选择了实验数据集，因为原始作者/实验学家清楚地确定了几何形状和边界条件，因此对于CFD分析没有歧义。对于90度湍流器方向，发现大多数两个方程模型在很大程度上取决于预测的传热水平。对于45度湍流器配置，发现由CFX提供的基于SST的新湍流公式与实验数据充分匹配。对于180度的转弯弯，通过这种新公式可以很好地预测Nusselt数。对于所有分析的几何形状，在CFX内采用特定的较高力矩闭合模型不会在准确性方面带来额外的好处。

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