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Effects of trench configuration on the film cooling effectiveness of a fan-shaped hole

机译：沟槽配置对扇形孔膜冷却效果的影响

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摘要

In this study, the effects of three trench configurations - the height, the distance from the hole exit to the downstream sidewall, and the radius of the curvature of the downstream sidewall - on the film cooling effectiveness of fan-shaped holes were experimentally investigated. The film cooling effectiveness was measured using pressure sensitive paint (PSP), and the experiment was conducted with blowing ratios of 1.0, 1.5, 2.0, and 2.5, and density ratios of 1.0 and 2.0. The results demonstrated that the film cooling effectiveness inside the trench was generally higher for cases with larger trench heights, smaller distances between the hole exit and downstream sidewall, and smaller radii of curvature. The smaller distances between the hole exit and downstream sidewall showed higher film cooling effectiveness outside the trench. The higher density ratio cases resulted in higher overall film cooling effectiveness. In general, the film cooling effectiveness for fan-shaped holes with a trench was higher than that without a trench. However, a lower trench resulted in lower film cooling effectiveness.
机译：在该研究中，三个沟槽配置的效果 - 高度，从空洞出口到下游侧壁的距离以及下游侧壁的曲率半径 - 在实验上研究了扇形孔的薄膜冷却效果。使用压敏涂料（PSP）测量膜冷却效果，并通过1.0,1.5,2.0和2.5的吹气比进行实验，密度比为1.0和2.0。结果表明，对于具有较大沟槽高度的情况，沟槽内的薄膜冷却效果通常更高，孔出口和下游侧壁之间的距离较小，以及较小的曲率半径。孔出口和下游侧壁之间的较小距离显示在沟槽外的更高的膜冷却效果。较高的密度比例造成较高的总膜冷却效果。通常，具有沟槽的扇形孔的薄膜冷却效果高于没有沟槽的孔。然而，较低的沟槽导致较低的薄膜冷却效果。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第10期|121655.1-121655.14|共14页
  • 作者

    Yu Jin Song; Sang Hyeon Park; Young Jun Kang; Jae Su Kwak;

  • 作者单位

    School of Aerospace and Mechanical Engineering Korea Aerospace University 76 Hanggongdaehak-ro Deogyang-gu Goyang-si Gyeonggi-do 10540 Republic of Korea;

    School of Aerospace and Mechanical Engineering Korea Aerospace University 76 Hanggongdaehak-ro Deogyang-gu Goyang-si Gyeonggi-do 10540 Republic of Korea;

    School of Aerospace and Mechanical Engineering Korea Aerospace University 76 Hanggongdaehak-ro Deogyang-gu Goyang-si Gyeonggi-do 10540 Republic of Korea;

    School of Aerospace and Mechanical Engineering Korea Aerospace University 76 Hanggongdaehak-ro Deogyang-gu Goyang-si Gyeonggi-do 10540 Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Gas turbine; Film cooling effectiveness; Trench; Pressure sensitive paint;

    机译：燃气轮机;薄膜冷却效果;沟;压力敏感油漆;

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