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首页> 外文会议>ASME turbo expo >EXTENDED MODELS FOR TRANSITIONAL ROUGH WALL BOUNDARY LAYERS WITH HEAT TRANSFER - PART II: MODEL VALIDATION AND BENCHMARKING
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EXTENDED MODELS FOR TRANSITIONAL ROUGH WALL BOUNDARY LAYERS WITH HEAT TRANSFER - PART II: MODEL VALIDATION AND BENCHMARKING

机译：具有传热的过渡粗糙墙边界层的扩展模型 - 第二部分：模型验证和基准测试

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Two extended models for the calculation of rough wall transitional boundary layers with heat transfer are presented. Both models comprise a new transition onset correlation, which accounts for the effects of roughness height and density, turbulence intensity and wall curvature. In the transition region, an intermittency equation suitable for rough wall boundary layers is used to blend between the laminar and fully turbulent state. Finally, two different submodels for the fully turbulent boundary layer complete the two models. In the first model, termed KS-TLK-T in this paper, a sand roughness approach from Durbin et al., which builds upon a two-layer k-ε-turbulence model, is used for this purpose. The second model, the so-called DEM-TLV-T model, makes use of the discrete-element roughness approach, which was recently combined with a two-layer k-ε-turbulence model by the present authors. The discrete element model will be formulated in a new way suitable for randomly rough topographies. Part Ⅰ of the paper will provide detailed model formulations as well as a description of the database used for developing the new transition onset correlation. Part Ⅱ contains a comprehensive validation of the two models, using a variety of test cases with transitional and fully turbulent boundary layers. The validation focuses on heat transfer calculations on both, the suction and the pressure side of modern turbine airfoils. Test cases include extensive experimental investigations on a high-pressure turbine vane with varying surface roughness and turbulence intensity, recently published by the current authors as well as new experimental data from a low-pressure turbine vane. In the majority of cases, the predictions from both models are in good agreement with the experimental data.
机译：提出了两个扩展模型，用于计算具有传热的粗壁过渡边界层。两种模型包括新的过渡开始相关性，其占粗糙度高度和密度，湍流强度和壁曲率的影响。在过渡区域中，适用于粗糙壁边界层的间歇式用于混合层状和完全湍流状态。最后，两个不同的子模型用于完全湍流边界层完成两种型号。在第一模型中，在本文中称为KS-TLK-T，来自Durbin等人的沙子粗糙度接近，其在两层K-ε-湍流模型上构建，用于此目的。第二模型，所谓的DEM-TLV-T模型，利用离散元粗糙度方法，该方法最近通过本作者与两层K-ε-湍流模型相结合。离散元件模型将以适合随机粗糙地形的新方式配制。本文的第Ⅰ部分将提供详细的模型配方以及用于开发新的过渡开始关联的数据库的描述。第Ⅱ部分包含两种型号的全面验证，使用各种具有过渡和完全湍流边界层的测试用例。验证侧重于现代涡轮机翼型的吸力和压力侧的传热计算。测试用例包括在高压涡轮叶片上具有不同表面粗糙度和湍流强度的广泛实验研究，最近由当前作者发布以及来自低压涡轮叶片的新实验数据。在大多数情况下，两种模型的预测与实验数据吻合良好。

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