Film Cooling With a Thermal Barrier Coating: Round Holes, Craters and Trenches
Film Cooling With a Thermal Barrier Coating: Round Holes, Craters and Trenches
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DOI：
10.1115/gt2012-70029
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发表时间：
2012-06
期刊：
影响因子：
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通讯作者：
F. T. Davidson;David A. Kistenmacher;D. Bogard
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文献类型：
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作者：
F. T. Davidson;David A. Kistenmacher;D. Bogard
在了解薄膜冷却和热障涂层（TBC）在保护高温涡轮机部件方面的相互关联性质方面，几乎没有做过什么工作。随着对提高发动机性能的需求不断增加，更好地了解涡轮机部件的热行为至关重要。本研究的目的是调查如何不同的薄膜冷却几何形状的影响的热传导涡轮机叶片与TBC的冷却性能。在这项研究中使用的叶片模型的设计，以匹配真实的发动机部件的热行为，通过适当缩放的对流传热系数以及叶片壁的导热系数。这允许测量TBC和叶片壁的界面处的温度，当无量纲化时，其代表实际发动机叶片的温度。这项研究发现，在内部冷却叶片的表面上添加TBC产生了几乎恒定的冷却性能，尽管吹风比发生了显着变化。发现本研究中的弹坑、沟槽和改进的沟槽提供比圆孔好得多的薄膜冷却覆盖率;然而，改进的薄膜冷却覆盖率仅导致TBC和叶片壁的界面处的温度略有改善。这些结果表明，使用更复杂的冷却配置的优势很小，特别是因为它们可能更容易受到TBC的影响。然而，沟槽和火山口设计改善的薄膜覆盖率可能会增加TBC的寿命，这将大大有利于叶片的长期热保护。
Little work has been done to understand the interconnected nature of film cooling and thermal barrier coatings (TBC’s) on protecting high temperature turbine components. With increasing demands for improved engine performance it is vital that a greater understanding of the thermal behavior of turbine components is achieved. The purpose of this study was to investigate how various film cooling geometries affect the cooling performance of a thermally conducting turbine vane with a TBC. The vane model used in this study was designed to match the thermal behavior of real engine components by properly scaling the convective heat transfer coefficients as well as the thermal conductivity of the vane wall. This allowed for the measurement of temperatures at the interface of the TBC and vane wall which, when non-dimensionalized, are representative of the temperatures present for actual engine vanes. This study found that the addition of TBC on the surface of an internally cooled vane produced a near constant cooling performance despite significant changes in the blowing ratio. The craters, trench and modified trench of this study were found to provide much better film cooling coverage than round holes; however, the improved film cooling coverage led to only slight improvements in temperature at the interface of the TBC and vane wall. These results suggest that there is minimal advantage in using more complicated cooling configurations, particularly since they may be more susceptible to TBC spallation. However, the improved film coverage from the trench and crater designs may increase the life of the TBC which would be greatly beneficial to the long-term thermal protection of the vane.Copyright © 2012 by ASME