Enhanced film cooling effectiveness by wall-roughness in cooling hole of turbine blade

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL

Journal of Enhanced Heat Transfer Pub Date : 2023-12-01 DOI:10.1615/jenhheattransf.2023049163

E. Martínez-Sandoval, Dulce Graciano, Fernando Zenaido SIERRA Espinosa, J García Castrejón

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引用次数: 0

Abstract

The film cooling is investigated numerically for gas turbine blade cooling. Film cooling performance is vital for blade safe operation. By calculating the film cooling effectiveness, the wall roughness inside the cooling hole effect is evaluated. Wall roughness by a turbulence promoter of aspect ratio K = L/h from 6 to 14, varying the pitch L and keeping constant the height h. Blowing ratio range from M = 0.5 to 2 and fixed mainstream Reynolds number, Re = 2.0 x 105 are tested. The cooling hole and flat plate surface with angle of 35o is used to compare the results and validate the CFD approach assessing the turbulence models k-ε RNG and RSM. A swirl flow develops inside the cooling hole due to installing the turbulence promoter. The coolant discharge turbulence parameters modify the normal case. The momentum and heat transfer rates have an impact on the film cooling performance. The results indicate film cooling effectiveness and surface protection enhancement of 9.84%, and 19.4%, respectively, for the best aspect ratio and blowing ratio. The coolant roughness may be used to improve the design of coolant hole and to reduce the number of orifices needed for safe gas turbine blades.

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利用涡轮叶片冷却孔的壁厚提高薄膜冷却效果

对用于燃气轮机叶片冷却的薄膜冷却进行了数值研究。薄膜冷却性能对叶片的安全运行至关重要。通过计算薄膜冷却效果，评估了冷却孔内壁粗糙度的影响。测试了长宽比 K = L/h 从 6 到 14 的湍流促进器的壁面粗糙度，改变了间距 L 并保持高度 h 不变。使用冷却孔和夹角为 35o 的平板表面对结果进行比较，并对评估湍流模型 k-ε RNG 和 RSM 的 CFD 方法进行验证。由于安装了湍流促进器，冷却孔内出现了漩涡流。冷却剂排放湍流参数改变了正常情况。动量和传热速率对薄膜冷却性能有影响。结果表明，在最佳长径比和吹气比下，薄膜冷却效果和表面保护效果分别提高了 9.84% 和 19.4%。冷却液粗糙度可用于改进冷却液孔的设计，减少安全燃气轮机叶片所需的孔口数量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Enhanced Heat Transfer 工程技术-工程：机械

CiteScore

3.60

自引率

8.70%

发文量

审稿时长

12 months

期刊介绍： The Journal of Enhanced Heat Transfer will consider a wide range of scholarly papers related to the subject of "enhanced heat and mass transfer" in natural and forced convection of liquids and gases, boiling, condensation, radiative heat transfer. Areas of interest include: ■Specially configured surface geometries, electric or magnetic fields, and fluid additives - all aimed at enhancing heat transfer rates. Papers may include theoretical modeling, experimental techniques, experimental data, and/or application of enhanced heat transfer technology. ■The general topic of "high performance" heat transfer concepts or systems is also encouraged.