Improved Film Cooling Effectiveness by Placing a Vortex Generator Downstream of Each Hole
Improved Film Cooling Effectiveness by Placing a Vortex Generator Downstream of Each Hole
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DOI：
10.1115/gt2008-51361
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
D. Rigby;J. Heidmann
中科院分区：
文献类型：
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作者：
D. Rigby;J. Heidmann
计算表明，将三角形涡流发生器的下游的薄膜冷却孔的效果。研究中包括吹风比、密度比和展向节距的影响。研究了具有30 °气膜孔的平板绕流。基于自由速度和孔径的雷诺数为11，300。使用Glenn-HT代码进行模拟，Glenn-HT代码是一种使用Wilcox k-ω湍流模型的全三维Navier-Stokes求解器。使用结构化多块网格，其具有大约一百万个单元，并且平均y+值为1的量级。局部和跨度平均有效性。分析和可视化的流动，以及讨论的机制，有助于显着提高效率。结果表明，三角形涡发生器能够消除由膜孔产生的上洗涡对，并在下游产生下洗涡对。
Calculations are presented demonstrating the effect of placing a delta vortex generator downstream of a film cooling hole. The effects of blowing ratio, density ratio, and spanwise pitch are included in the study. Flow over a flat plate with film cooling holes oriented at a 30 degree angle was investigated. The Reynolds numbers based on the freestream velocity and the hole diameter was 11,300. The simulation was performed using the Glenn-HT code, a full three-dimensional Navier-Stokes solver using the Wilcox k-ω turbulence model. A structured multi-block grid was used with approximately one million cells, and average y+ values on the order of unity. Local and span averaged effectiveness are presented. Analysis and visualization of the flow are presented as well as a discussion on the mechanisms which contribute to the dramatic improvement in effectiveness. The results demonstrate that the delta vortex generator was able to annihilate the up-wash vortex pair produced by the film hole and produce a down-wash pair downstream.