Conjugate heat transfer and flow analysis on double-wall cooling structures with a sinusoidal corrugated target surface

IF 6.1 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2025-05-05 DOI:10.1016/j.applthermaleng.2025.126640

Yu Li , Songtao Wang , Fengbo Wen , Le Cai , Zhiyuan Zhao , Yuxi Luo

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Abstract

A double-wall cooling structure with a sinusoidal corrugated target surface is put forward to optimize the cooling performance and improve the temperature uniformity of gas turbine blades. The improvement is achieved by altering the length-to-diameter ratio of effusion holes and thermal resistance around the stagnation point by adjusting the corrugation amplitude and the positioning of film holes. Conjugate heat transfer (CHT) analysis is conducted to study the flow characteristics, cooling performance, and temperature uniformity. The results depict that the structure with effusion holes located at the valley exhibits the best comprehensive cooling performance under all operating conditions. In comparison to the double-wall structure with a flat target surface, when the impingement distance is set to 1 and the blowing ratio is 1, the overall cooling effectiveness increased by 2.59%, and the temperature uniformity within the solid domain and on the mainstream side of the effusion cooling plate increased by 5.6% and 5.8%, respectively. Furthermore, the Nusselt number on the target surface shows a bimodal peak annular distribution when the blowing ratio is 2. The largest second peak of the Nusselt number occurs for the structure with film holes at the valley, which is closest to the stagnation point at approximately 1.5D radially. Conversely, the structure with film holes at the peak shows the smallest second peak, which occurs furthest away at around 1.9D. Finally, increasing the impingement distance reduces temperature uniformity within the solid domain but affects overall cooling effectiveness less.

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带正弦波纹靶面的双壁冷却结构的共轭传热与流动分析

为了优化燃气轮机叶片的冷却性能，提高叶片温度均匀性，提出了一种目标面为正弦波纹的双壁冷却结构。通过调整波纹幅度和膜孔的位置，改变积液孔的长径比和滞止点周围的热阻，达到改善积液孔的目的。采用共轭传热（CHT）分析方法对其流动特性、冷却性能和温度均匀性进行了研究。结果表明，在所有工况下，位于山谷处的射流孔结构的综合冷却性能最好。与平坦靶面双壁结构相比，当撞击距离为1、吹气比为1时，整体冷却效率提高了2.59%，射流冷却板固体区域内和主流侧温度均匀性分别提高了5.6%和5.8%。当吹气比为2时，靶表面的努塞尔数呈双峰环形分布。Nusselt数最大的第二峰出现在山谷处有膜孔的结构，在径向约1.5D处最接近驻点。相反，在峰处有膜孔的结构，其第二峰最小，出现在距离最远的1.9D左右。最后，增加碰撞距离会降低固体区域内的温度均匀性，但对整体冷却效果的影响较小。

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来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.