The high-pressure turbine blades are the components of the aero-engines which are the most exposed to extreme thermal conditions. To alleviate this issue, the blades are equipped with cooling systems to ensure long-term operation. However, the accurate prediction of the blade temperature and the design of the cooling system in an industrial context still remains a major challenge. Potential improvement is foreseen with Large-Eddy Simulation (LES) which is well suited to predict turbulent flows in such complex systems. Nonetheless, performing LES of a real cooled high-pressure turbine still remains expensive. To alleviate the issues of CPU cost, a cooling model recently developed in the context of combustion chamber liners is assessed in the context of blade cooling. This model was initially designed to mimic coolant jets injected at the wall surface and does not require to mesh the cooling pipes leading to a significant reduction in the CPU cost. The applicability of the model is here evaluated on the cooled Nozzle Guide Vanes (NGV) of the Full Aerothermal Combustor Turbine interactiOns Research (FACTOR) test rig. To do so, a hole modeled LES using the cooling model is compared to a hole meshed LES. Results show that both simulations yield very similar results confirming the capability of the approach to predict the adiabatic film effectiveness. Advanced post-processing and analyses of the coolant mass fraction profiles show that the turbulent mixing between the coolant and hot flows is however reduced with the model. This finding is confirmed by the turbulent map levels which are lower in the modeled approach. Potential improvements are hence proposed to increase the accuracy of such methods.

中文翻译：

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用大涡模拟对冷却高压叶片的冷却剂喷射模型进行评估

高压涡轮叶片是航空发动机中最容易暴露在极端热条件下的部件。为了缓解这个问题，叶片配备了冷却系统，以确保长期运行。然而，在工业环境中准确预测叶片温度和冷却系统的设计仍然是一个重大挑战。大涡模拟 (LES) 可以预见潜在的改进，它非常适合预测此类复杂系统中的湍流。尽管如此，执行真正的冷却高压涡轮机的 LES 仍然很昂贵。为了缓解 CPU 成本问题，最近在燃烧室衬里环境中开发的冷却模型在叶片冷却环境中进行了评估。该模型最初旨在模拟在壁表面注入的冷却剂射流，并且不需要对冷却管进行网格划分，从而显着降低 CPU 成本。该模型的适用性是在全气热燃烧器涡轮相互作用研究 (FACTOR) 试验台的冷却喷嘴导向叶片 (NGV) 上进行评估的。为此，将使用冷却模型的孔建模 LES 与孔网格 LES 进行比较。结果表明，两种模拟产生非常相似的结果，证实了该方法预测绝热膜有效性的能力。然而，冷却剂质量分数分布的高级后处理和分析表明，冷却剂和热流之间的湍流混合在模型中减少了。这一发现得到了模拟方法中较低的湍流图水平的证实。因此，建议进行潜在的改进以提高此类方法的准确性。