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On the effect of geometry of w-wave trenches on film cooling performance of gas turbine blades
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy ( IF 1.7 ) Pub Date : 2021-04-07 , DOI: 10.1177/09576509211008277
Alireza Bakhshinejad Bahambari 1 , Mohammad Hassan Kayhani 1 , Mahmood Norouzi 1
Affiliation  

In the present study, three types of w-wave trenches with different amplitude configurations are compared with transverse trench (TT), and the use of variable radius fillet (VRF) on downstream lips at different blowing ratio is numerically investigated to measure heat transfer coefficient, and cooling effectiveness. The numerical results are obtained by three-dimensional Reynolds average Navier–Stokes equations (RANS) while employing shear stress transport turbulence models, which are validated by comparing with experimental data. The trench width is kept constant in all cases, yet the three different amplitudes and variable fillet radiuses offered a variety of designs in trench film cooling. The results showed that w-wave trenches impressively improved film cooling effectiveness over the transverse trench, and utilizing fillets at downstream lips of the trench caused significant enhancement on both lateral averaged and centerline cooling performance. Due to the w-wave trench configuration, anti-counter-rotating vortices responsible for pushing coolant film toward the near-wall were formed throughout of downstream wall of the trench, and the cooling flow thus had a more uniform structure. The heat transfer coefficient distributions of filleted w-wave trenches are observed to be more uniform than simple w-wave and transverse trench under all blowing ratio conditions. Moreover, enlargement of the fillet radius in Cases 2 and 3 yielded to the growth of centerline coolant flow, which in turn resulted in the improvement of film cooling effectiveness at all blowing ratios.



中文翻译:

W波沟槽的几何形状对燃气轮机叶片薄膜冷却性能的影响

在本研究中,将三种具有不同振幅配置的w波沟槽与横向沟槽(TT)进行了比较,并数值研究了在不同吹炼比的下游唇缘上使用可变半径圆角(VRF)来测量传热系数,散热效果好。数值结果是通过三维雷诺平均Navier–Stokes方程(RANS)并采用剪切应力传输湍流模型获得的,并与实验数据进行了比较。在所有情况下,沟槽宽度都保持恒定,但是三种不同的振幅和可变的圆角半径在沟槽膜冷却中提供了多种设计。结果表明,W形沟槽在横向沟槽上显着提高了薄膜的冷却效率,在沟槽的下游边缘使用圆角会显着提高横向平均和中心线的冷却性能。由于w波沟槽的构造,在沟槽的整个下游壁上形成了负责将冷却剂膜推向近壁的反反向旋涡,因此冷却流具有更均匀的结构。在所有吹风比条件下,圆角w形沟槽的传热系数分布都比简单的w形和横向沟槽更均匀。此外,在情况2和3中,圆角半径的增大导致中心线冷却剂流量的增加,进而导致在所有吹塑比下膜冷却效率的提高。

更新日期:2021-04-08
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