变膜孔直径及布置对非定常冷却性能影响的实验研究

IF 2.8 2区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Thermal and Fluid Science Pub Date : 2025-01-21 DOI:10.1016/j.expthermflusci.2025.111415

Liwei Ma, Xinyu Liu, Wenhao Guo, Jianhua Wang, Jian Pu, Ran Yao

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引用次数: 0

摘要

为了减少不稳定性和提高膜的时间平均覆盖性能，提出了变孔径和变孔排列的新概念。在平板上嵌入五排直径为0.0020 m ~ 0.0038 m的膜孔，包括五种排列方式。采用时间分辨定量光片技术，实验研究了布置方式、吹风比和板厚对非定常和时间平均行为的影响。采用适当的正交分解分析方法分析了大尺度结构的空间模态，并利用动量厚度和速度分布来表征流场。本研究揭示了两个重要而有价值的现象：1)对于薄板（长径比较小，L/D），“孔径由大到小”排列比其他排列可获得最高的时间平均膜覆盖性能和最低的不稳定性。2)与孔径不变的厚板（大L/D）相比，“孔径由大到小”和“孔径小在中间”排列的薄板具有更高的时均性能和更小的非稳定性。这一探索为气膜冷却的研究者和设计者提供了一条新的思路。

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An experimental study on the influence of variable film-hole diameter and arrangement on unsteady cooling performance

To reduce the unsteadiness and enhance the time-averaged film coverage performance, a novel conception of variable hole-diameter and arrangement is suggested. Five rows of film-holes with diameters ranging from 0.0020 m to 0.0038 m are embedded on a flat plate, including five kinds of arrangements. The effects of arrangement scheme, blowing ratio and plate thickness on the unsteadiness and time-averaged behaviors are experimentally investigated by time-resolved quantitative light sheet technique. The spatial modes of large-scale structures are analyzed by proper orthogonal decomposition analysis, and the flow field are characterized by momentum thickness and velocity distribution. The present work reveals two important and valuable phenomena: 1) For the thin plate (small length-to-diameter ratio, L/D), the arrangement of “hole-diameter from large to small” can achieve the highest time-averaged film coverage performance and the lowest unsteadiness than the other arrangements. 2) Compared with the thick plate (large L/D) with unchanged hole-diameter, the thin plates with the arrangements of “hole-diameter from large to small” and “small hole-diameter in the middle” can provide higher time-averaged performance and lower unsteadiness. This exploration may provide the investigators and designers of film cooling with a new thread.

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来源期刊

Experimental Thermal and Fluid Science 工程技术-工程：机械

CiteScore

6.70

自引率

3.10%

发文量

159

审稿时长

34 days

期刊介绍： Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.