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Large-eddy simulation of an inclined round jet issuing into a crossflow

机译：斜流射流产生横流的大涡模拟

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摘要

For understanding of film cooling flow fields on gas turbine blades, this paper reports on a series of large-eddy simulations of an inclined round jet issuing into a crossflow. Simulations were performed at four blowing ratios, BR - 0.1, 0.5, 0.7 and 1.0, and the Reynolds number, Re = 15,300, based on the crossflow velocity and film cooling hole diameter. Results showed that the cooling jet flow structure drastically changed with the blowing ratio. A pair of rear vortices and hairpin vortices were observed for BR = 0.1. A horseshoe vortex periodically ejected, a pair of hanging vortices, a pair of rear vortices and hairpin vortices were observed for BR = 0.5. Similar vortical structures to BR - 0.5 were observed for BR = 0.7 although horseshoe vortex was not ejected periodically and stayed at a leading edge of the hole exit. For BR = 1.0, in addition to the former mentioned vortices, shear layer vortices and vertical streaks were observed on an upstream edge of the jet. It was consequently understood that the ubiquitous counter-rotating vortex pair which can be observed in the time-averaged flow field was actually originated in the different vortical structures with varying BR conditions. Temperature fields were also investigated to clarify how these different vortical structures affect the film cooling effectiveness.
机译：为了了解燃气轮机叶片上的薄膜冷却流场，本文报告了一系列大涡流模拟，这些模拟是将圆形的圆形射流喷入横流中。基于横流速度和薄膜冷却孔直径，在四个吹塑比BR-0.1、0.5、0.7和1.0以及雷诺数Re = 15,300下进行了模拟。结果表明，冷却射流的结构随鼓风比而急剧变化。观察到一对后部涡流和发夹涡流，BR = 0.1。周期性喷出马蹄涡，观察到一对悬挂涡，一对后涡和发夹涡，BR = 0.5。对于BR = 0.7，观察到与BR-0.5相似的涡旋结构，尽管马蹄涡流没有周期性地喷射并停留在孔出口的前缘。对于BR = 1.0，除了前面提到的涡旋，在射流的上游边缘还观察到了剪切层涡旋和垂直条纹。因此可以理解，在时间平均流场中可以观察到的普遍存在的反向旋转涡流实际上起源于具有不同BR条件的不同涡旋结构。还研究了温度场以阐明这些不同的涡旋结构如何影响薄膜的冷却效率。

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  • 作者

    E. Sakai; T. Takahashi; H. Watanabe;

  • 作者单位

    Central Research Institute of Electric Power Industry, Energy Research Laboratory, 2-6-1, Nagasaka, Yokosuka-shi, Kanagawa-ken 240-0196, Japan;

    Central Research Institute of Electric Power Industry, Energy Research Laboratory, 2-6-1, Nagasaka, Yokosuka-shi, Kanagawa-ken 240-0196, Japan;

    Central Research Institute of Electric Power Industry, Energy Research Laboratory, 2-6-1, Nagasaka, Yokosuka-shi, Kanagawa-ken 240-0196, Japan;

  • 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

    Crossflow jet; Vortex; Large-eddy simulation; Film cooling;

    机译：错流射流;涡流;大涡模拟;薄膜冷却;

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