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首页> 外文期刊>International Journal of Heat and Mass Transfer >Large eddy simulation of an inclined jet in crossflow with vortex generators
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Large eddy simulation of an inclined jet in crossflow with vortex generators

机译：涡流发电机横流倾斜喷射的大型涡流模拟

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摘要

Film cooling is one of the essential approaches to cool high-performance turbine blades. Film cooling with delta winglet vortex generator pair (DWVGP) placed upstream of the cooling hole is investigated by large eddy simulation (LES) at the blowing ratio of M=1.0. Film cooling effectiveness and vortical structures are evaluated in the flow field of a jet in crossflow (JICF). Results indicate that film cooling effectiveness increases significantly for the DWVGP case. As a dominant vortex structure, the ubiquitous counter-rotating vortex pair (CRVP) is recognized in the flow field. It has a detrimental effect that lifts the coolant off the cooling surface. The DWVGP evolved anticounter-rotating vortex pair (anti-CRVP) has the opposite sense of rotation to the jet introduced CRVP, which undertakes vorticity decay when developing downstream of the cooling hole. With the downwash effect of anti-CRVP, the reattachment of coolant is earlier, and a wide region of enhanced film cooling effectiveness in the spanwise direction is achieved. The coherent vortex structures including the classical vortices in the flow field and the vortex generator pair introduced vortices are analyzed. The genesis and evolution mechanism of CRVP with and without the vortex generators are discussed. It indicates that three branches of upstream spiral structures from the nozzle tube contribute to the CRVP. The merging of CRVP upstream branches is delayed by the vortex generators evolved anti-CRVP, which postpones the formation of downstream CRVP.
机译：薄膜冷却是冷却高性能涡轮叶片的必要方法之一。通过大的涡流模拟（LES）在M = 1.0的吹气比下，通过大的涡流仿真（LES）来研究薄膜冷却玻璃翼涡流发生器对（DWVGP）。在交叉流（JICF）的喷射流场中评估薄膜冷却效果和涡流结构。结果表明，DWVGP情况下，薄膜冷却效果显着增加。作为主导涡旋结构，在流场中识别出无处不在的反向旋转涡旋对（CRVP）。它具有有害效果，使冷却剂从冷却表面上抬起。 DWVGP进化的逆转涡旋对（防CRVP）具有与喷射引入CRVP的相反的旋转感，这在冷却孔的下游进行涡流衰减。随着抗CRVP的挖掘效果，冷却剂的重新附着更早，实现了跨度方向上的增强膜冷却效果的宽区域。分析了包括流场和涡流发生器对引入涡流的经典涡流的相干涡流结构。讨论了CRVP与涡流发生器的成因和进化机制。它表明来自喷嘴管的上游螺旋结构的三个分支有助于CRVP。 CRVP上游分支的合并被涡旋发电机推迟了抗CRVP，推迟了下游CRVP的形成。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第5期|121032.1-121032.13|共13页
  • 作者

    Zhiyuan Zhao; Fengbo Wen; Xiaolei Tang; Yuxi Luo; Rui Hou; Zhongqi Wang;

  • 作者单位

    School of Energy Science and Engineering. Harbin Institute of Technology. Harbin. 150001. China;

    School of Energy Science and Engineering. Harbin Institute of Technology. Harbin. 150001. China;

    School of Energy Science and Engineering. Harbin Institute of Technology. Harbin. 150001. China;

    School of Energy Science and Engineering. Harbin Institute of Technology. Harbin. 150001. China;

    School of Energy Science and Engineering. Harbin Institute of Technology. Harbin. 150001. China;

    School of Energy Science and Engineering. Harbin Institute of Technology. Harbin. 150001. China;

  • 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

    film cooling; large eddy simulation; delta winglet vortex generator pair; vortical structures;

    机译：薄膜冷却;大涡模拟;Delta Winglet Vortex发生器对;志性结构;

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