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Effect of external turbulence on the efficiency of film cooling with coolant injection into a transverse trench

机译：外部湍流对冷却剂注入横向沟槽的薄膜冷却效率的影响

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Film cooling is among the basic methods used for thermal protection of blades in modern high-temperature gas turbines. Results of computer simulation of film cooling with coolant injection via a row of conventional inclined holes or a row of holes in a trench are presented in this paper. The ANSYS CFX 14 commercial software package was used for CFD-modeling. The effect is studied of the mainstream turbulence on the film cooling efficiency for the blowing ratio range between 0.6 and 2.3 and three different turbulence intensities of 1, 5, and 10%. The mainstream velocity was 150 and 400 m/s, while the temperatures of the mainstream and the injected coolant were 1100 and 500°C, respectively. It is demonstrated that, for the coolant injection via one row of trenched holes, an increase in the mainstream turbulence intensity reduces the film cooling efficiency in the entire investigated range of blowing ratios. It was revealed that freestream turbulence had varied effects on the film cooling efficiency depending on the blowing ratio and mainstream velocity in a blade channel. Thus, an increase in the mainstream turbulence intensity from 1 to 10% decreases the surface-averaged film cooling efficiency by 3-10% at a high mainstream velocity (400 m/s) in the blade channel and by 12-23% at a moderate velocity (of 150 m/s). Here, lower film cooling efficiencies correspond to higher blowing ratios. The effect of mainstream turbulence intensity on the film cooling efficiency decreases with increasing the mainstream velocity in the modeled channel for both investigated configurations.
机译：薄膜冷却是用于现代高温燃气轮机叶片热保护的基本方法之一。本文介绍了通过冷却液通过一排传统的倾斜孔或沟槽中的一排孔注入冷却薄膜的计算机模拟结果。 ANSYS CFX 14商业软件包用于CFD建模。研究了主流湍流对吹塑比在0.6和2.3之间以及三种不同的湍流强度分别为1、5和10％的薄膜冷却效率的影响。主流速度为150和400 m / s，而主流和注入的冷却剂的温度分别为1100和500°C。结果表明，对于通过一排沟槽喷射冷却剂，主流湍流强度的增加会在整个研究的吹塑比范围内降低薄膜冷却效率。揭示了自由流湍流对薄膜冷却效率的影响各不相同，这取决于吹气比和叶片通道中的主流速度。因此，主流湍流强度从1％增加到10％，在叶片通道中以高主流速度（400 m / s）时，表面平均薄膜冷却效率降低了3-10％，而在叶片通道中则降低了12-23％。中等速度（150 m / s）。在此，较低的薄膜冷却效率对应较高的吹塑比。对于两种研究的构型，主流湍流强度对薄膜冷却效率的影响都随着模拟通道中主流速度的增加而降低。

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