Study of an Optimized Trench Film Cooling Configuration Using Scale Adaptive Simulation and Infrared Thermography
Study of an Optimized Trench Film Cooling Configuration Using Scale Adaptive Simulation and Infrared Thermography
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DOI：
10.1115/gt2014-25144
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发表时间：
2014-06
影响因子：
13.1
通讯作者：
P. Schreivogel;Bernhard Kröss;M. Pfitzner
中科院分区：
文献类型：
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作者：
P. Schreivogel;Bernhard Kröss;M. Pfitzner
在本文中，一个狭窄的，有角度的沟槽布局提出和数值优化。在优化过程中，沟槽的宽度和深度以及边缘轮廓是变化的。对于每个设计，优化器自动创建几何体和结构化六面体网格。然后，根据RANS计算，从M = 1到6的六个吹风比进行了评估。气膜冷却效率的空间平均值和标准差作为优化器的目标变量。对一种新的结构进行了更详细的研究，并与深度为0.75孔直径D和冷却孔角度α = 30度的沟槽进行了比较。对于这两种配置的非定常模拟使用的混合SAS湍流模型进行了验证，对红外热成像测量的绝热薄膜冷却效率。SAS和实验之间的匹配相比，RANS计算与可实现的k-e-模型得到改善。优化后的结构使气膜冷却性能有了显著的提高。沟槽的后掠形状促进了冷却剂的横向扩散，而减小的沟槽宽度减少了冷却孔之间区域中冷却空气和热自由流气体的混合。© 2014 ASME
In the present paper, a narrow, angled trench layout is proposed and numerically optimized. In the optimization process the trench width and depth as well as the edge contour were varied. For each design, the optimizer automatically created the geometry and a structured hexahedral mesh. Then, six blowing ratios from M = 1 to 6 were evaluated based on RANS computations. The spatial average and the standard deviation of the film cooling effectiveness served as objective variables for the optimizer. One novel configuration was studied in more detail and compared to a trench with a depth of 0.75 hole diameters D and a cooling hole angle of α = 30 deg. For both configurations unsteady simulations using the hybrid SAS turbulence model were carried out and validated against infrared thermography measurements of the adiabatic film cooling effectiveness. The match between SAS and experiment is improved compared to RANS computations with the realizable k-e-model. The optimized configuration yields a significant improvement of the film cooling performance. The swept shape of the trench promotes the lateral spreading of the coolant, while the decreased trench width reduces the mixing of cooling air and hot free-stream gas in the region between the cooling holes.© 2014 ASME