Numerical Analysis of Film Cooling Flow Dynamics and Thermodynamics for Perfect and Imperfect Cooling Holes

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-06-01 DOI:10.47176/jafm.17.6.2251

S. Liang, †. R.L.Dong, W. W. Xu, Y. Q. Wei

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Abstract

Film cooling protects high-temperature components and generates complex vortex structures through the interaction between the mainstream flow and the injected coolant. Additionally, the process of applying thermal barrier coatings introduces imperfect cooling holes. A numerical simulation study is conducted on two geometric configurations: inclined perfect and imperfect holes arranged in a single row on a flat plate to investigate the effects of flow field vortex structures and hole imperfections. The k-epsilon turbulent model is employed to analyse the impact of varying blowing ratios and defect positions on flow field structure and cooling efficiency, with vortex dynamics providing explanatory insights. As the blowing ratio increases, the kidney vortex associated with the perfect holes progressively detaches from the wall, reducing film cooling efficiency. The kidney vortex originates from the shear interaction between the mainstream and the impinging jet, predominantly influenced by the vortex stretching component. Imperfect holes influence the distribution state of the kidney vortex, with weakened roll-up phenomena observed at the IT4 defect location. Consequently, a noticeable enhancement in film cooling effectiveness is achieved near the proximal end of the hole.

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完美和不完美冷却孔的薄膜冷却流动力学和热力学数值分析

薄膜冷却可保护高温部件，并通过主流流与注入的冷却剂之间的相互作用产生复杂的涡流结构。此外，涂覆隔热涂层的过程会产生不完美的冷却孔。为了研究流场涡流结构和孔缺陷的影响，我们对平板上单排排列的倾斜完美孔和不完美孔这两种几何配置进行了数值模拟研究。采用 k-epsilon 湍流模型分析了不同吹气比和缺陷位置对流场结构和冷却效率的影响，涡流动力学提供了解释性见解。随着吹气比的增大，与完美孔洞相关的肾涡逐渐脱离壁面，从而降低了薄膜冷却效率。肾型漩涡源于主流和撞击射流之间的剪切相互作用，主要受漩涡拉伸分量的影响。不完善的孔会影响肾涡的分布状态，在 IT4 缺陷位置观察到的卷曲现象会减弱。因此，在孔的近端附近，薄膜冷却效果明显增强。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.

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