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首页> 外文期刊>International Journal of Heat and Mass Transfer >Application of algebraic anisotropic turbulence models to film cooling flows
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Application of algebraic anisotropic turbulence models to film cooling flows

机译：代数各向异性湍流模型在薄膜冷却流中的应用

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摘要

The complex structures in the flow field of gas turbine film cooling increase the anisotropy of turbulence making it difficult to accurately compute turbulent eddy viscosity and scalar diffusivity. An algebraic anisotropic turbulence model is developed while aiming at a more accurate modeling of the Reynolds stress and turbulent scalar flux. The developed algebraic anisotropic turbulence model is validated by a classic film cooling experiment and further verified by a series of in-house experiments with different hole geometries, density ratios and blowing ratios. On one hand, the anisotropic eddy viscosity method improves the modeling of Reynolds stress and the predictive flow field. On the other hand, the anisotropic turbulent scalar-flux model includes the role of anisotropic eddy viscosity in modeling of scalar flux and improves the turbulent scalar flux prediction. Compared with the experimental results, the algebraic anisotropic turbulence model is available and accurate quantitatively. The algebraic anisotropic turbulence model is prospective to improve the RANS predictive capability of film cooling.
机译：燃气轮机薄膜冷却流场中的复杂结构增加了湍流的各向异性，使得难以准确计算湍流涡流粘度和标量扩散率。建立了代数各向异性湍流模型，同时旨在更精确地建模雷诺应力和湍流标量通量。已开发的代数各向异性湍流模型已通过经典的薄膜冷却实验验证，并通过一系列具有不同孔几何形状，密度比和吹塑比的内部实验进一步验证。一方面，各向异性涡粘度法改善了雷诺应力的建模和预测流场。另一方面，各向异性湍流标量通量模型包括各向异性涡流粘度在标量通量建模中的作用，并改善了湍流标量通量的预测。与实验结果相比，代数各向异性湍流模型是可用的并且定量准确。代数各向异性湍流模型有望提高薄膜冷却的RANS预测能力。

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