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RANS EVALUATIONS OF INTERNAL COOLING PASSAGE GEOMETRIES: RIBBED PASSAGES AND A 180 DEGREE BEND

机译：Rans内部冷却通道几何形状评估：罗纹通道和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：基于RAN的湍流模型的综合研究和评估是对涡轮叶片的内部冷却管道通道进行的。执行90和45度湍流管道的共轭计算传热研究，并与来自Von Karmon Institute的实验数据进行比较。使用CFX与基于几次RANS的湍流模型一起计算空间分辨的营养数分布。此外，与亚利桑那州立大学的实验数据进行了类似的对180度周转弯曲的类似计算研究。在该实验中，在整个180度转动弯曲的不同位置处提供区域平均篮板。对于这两种分析，实验数据集被仔细选择，因为原始作者/实验主义者清楚地识别了几何和边界条件，使得CFD分析没有模糊性。对于90度湍流件取向，发现大多数两个方程模型在很大程度上在预测的传热水平下。对于45度湍流器配置，发现由CFX提供的新的SST基湍流配方，充分匹配实验数据。对于180度的周转弯曲，通过这种新的配方预测了纽带。对于分析的所有几何形状，借助CFX内部的特定较高时刻的封闭模型不提供准确性的额外效益。

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