Experimental and numerical study on configuration, shape, distance and angle of attack in film cooling implementing vortex generator

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-04-22 DOI:10.1177/09576509241248678

Nirmal Halder

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Abstract

The impact of vortex generator configuration, shape, angle of attack and distance between vortex generator and film cooling hole has been studied using both experimental and numerical methods for enhancing the gas turbine blade’s film cooling efficiency. Infrared (IR) thermography technique has been used for investigating the temperature field. In order to obtain the velocity field ANSYS FLUENT has been implemented. The diameter of the film cooling hole and the cross-flow velocity are used to calculate the Reynolds number, which is set at 2369. The blowing ratio of the jet to the cross-flow has been changed to 0.5, 1.0, and 1.5. Effect of CFU and common flow down configuration has been investigated. The angle of attack has been varied as 35° and 45°. It is observed that common flow down configuration of vortex generator performs better than Common Flow Up configuration. Common flow down configuration as well as lower distance between vortex generator and film cooling hole enhance the film cooling effectiveness due to generation of secondary longitudinal vortices which decrease the strength of the counter rotating vortex structures. Among all the shape (triangular, rectangular and trapezoidal) rectangular vortex generator performs better. Growths of shear layer vortices are modified due to the inclusion of vortex generator. Overall, Vortex Generator with common flow down configuration and 35° angle of attack performs better than Common Flow Up configuration due to generation of secondary longitudinal vortices which annihilates the counter rotating vortex structures due to having rotational tendency opposite to Counter rotating vortex pair.

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关于涡流发生器在薄膜冷却中的配置、形状、距离和攻击角的实验和数值研究

采用实验和数值方法研究了涡流发生器的配置、形状、攻角以及涡流发生器与薄膜冷却孔之间的距离对提高燃气轮机叶片薄膜冷却效率的影响。红外热成像技术用于研究温度场。为了获得速度场，使用了 ANSYS FLUENT。薄膜冷却孔的直径和横流速度用于计算雷诺数，雷诺数设定为 2369。射流与横流的吹气比分别变为 0.5、1.0 和 1.5。研究了 CFU 和共同流下配置的影响。攻角变化为 35° 和 45°。据观察，涡流发生器的共流向下配置比共流向上配置性能更好。共同向下流动结构以及漩涡发生器与薄膜冷却孔之间的较小距离都能提高薄膜冷却效果，这是因为次级纵向漩涡的产生降低了反向旋转漩涡结构的强度。在所有形状（三角形、矩形和梯形）的涡流发生器中，矩形涡流发生器的性能更好。由于加入了涡流发生器，剪切层涡流的增长发生了变化。总体而言，采用普通流下结构和 35° 攻角的涡流发生器比普通流上结构的涡流发生器性能更好，这是因为产生了次级纵向涡流，而次级纵向涡流由于具有与反向旋转涡流对相反的旋转趋势，因此会湮灭反向旋转涡流结构。

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

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.