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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers >Effect of turbulence models' choice on the aero-thermal flow numerical validations within a ribbed trailing edge geometry
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Effect of turbulence models' choice on the aero-thermal flow numerical validations within a ribbed trailing edge geometry

机译：湍流模型选择对肋状后缘几何形状内的热流数值验证的影响

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摘要

In this paper, the commercial ANSYS Fluent software was used to achieve a numerical survey of the effect of five (05) turbulence models' formulation on the aero-thermal computational fluid dynamics validation of two 30:1 scaled models reproducing an original internal ribbed trailing edge prototype. Tests were conducted for stationary and rotation conditions, for Re = 10,000-40,000 and Ro = 0-0.23. Particle image velocimetry and thermochromic liquid crystal experimental data were employed to check the consistence computational fluid dynamics results qualitatively and quantitatively, aerodynamically and thermally, for various working conditions. Numerical predictions revealed that the choice of the turbulence model affects the accuracy of results. Concerning the shear stress transport k-w model, limiters defined in the eddy viscosity formulation induce a surplus estimation of the turbulence kinetic energy (k) which leads to noticeable discrepancies in terms of velocity profiles and recirculation zones. Also, numerical calculations confirmed former experimental assumptions concerning origins of the aerodynamic structures and heat transfer's features, especially, those related to the increase of the cooling temperature balance efficiency, the appearance/disappearance of the horseshoe structures within the trailing edge region and velocities/boundary layers' profile variations. The obtained results assist the understanding and the forecast of the flow field behavior, throughout the design process, by the assessment of the aerodynamic and thermal performances within the considered blade's cooling system.
机译：在本文中，使用商用ANSYS Fluent软件对五（05）个湍流模型的公式化对两个30：1比例模型的气热计算流体动力学验证的影响进行了数值调查，该模型再现了原始的内部带肋尾迹边缘原型。针对固定和旋转条件进行了测试，其中Re = 10,000-40,000，Ro = 0-0.23。利用颗粒图像测速和热致变色液晶实验数据，在各种工况下，定性，定量，空气动力学和热学地检查了流体动力学计算结果的一致性。数值预测表明，湍流模型的选择会影响结果的准确性。关于剪切应力传递k-w模型，在涡流粘度公式中定义的限制器引起了湍流动能（k）的过量估计，这导致了速度分布和再循环区域方面的明显差异。此外，数值计算证实了有关空气动力学结构起源和传热特性的先前实验假设，尤其是那些与冷却温度平衡效率的提高，后缘区域内的马蹄形结构的出现/消失以及速度/边界有关的假设。层的轮廓变化。通过评估所考虑叶片的冷却系统内的空气动力和热性能，获得的结果有助于在整个设计过程中理解和预测流场行为。

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