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首页> 外文期刊>Aerospace science and technology >Tip leakage vortex and its breakdown mechanism in aspirated compressor cascades designed with conventional method and curvature induced pressure recovery concept
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Tip leakage vortex and its breakdown mechanism in aspirated compressor cascades designed with conventional method and curvature induced pressure recovery concept

机译：尖端泄漏涡流及其采用常规方法和曲率诱导压力恢复概念设计的吸气压缩机级联中的击穿机制

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摘要

Boundary layer suction (BLS), or aspiration, is an effective methodology to eliminate flow separation and improve blade loading in axial compressors. The objective of this study is to reveal the flow physics and loss mechanism of tip leakage vortex in aspirated compressor cascades with multiple loading levels under diffusion factor ranging from 0.42 to 0.71. The effect of blade pressure distribution on tip leakage flows was investigated numerically based on three aspirated blades, including the one designed with conventional method and the other two designed with curvature induced pressure recovery. The influences of tip clearance dimension and BLS schemes (BLS location, BLS height and BLS mass flow rate) on tip leakage vortex as well as its breakdown mechanism were investigated. Results show that a pseudo-shock was found in aspirated compressor cascades designed with conventional method and curvature induce pressure recovery concept. Compared with conventional compressor blades, the main flow phenomenon of tip leakage flow of aspirated compressor blades is the tip leakage vortex breakdown (TLVB) caused by strong adverse pressure gradient introduced by BLS. The TLVB phenomenon occurred both in conventionally loaded compressor cascade and highly loaded compressor cascade. For conventionally loaded blade, TLVB phenomenon occurred under low tip clearance condition but disappeared under high tip clearance condition due to increased strength of tip leakage vortex. Lower BLS mass flow resulted in weaker pseudo-shock, which reduced the swirl number of tip leakage vortex and improved the vortex breakdown phenomenon as a consequence. The vortex breakdown of highly loaded cascades was resulted from the joint action of high blade loading and pseudo-shock. Pseudo-shock designed near blade trailing edge resulted in higher leakage mass flow but promised superior tip leakage flow field. For all the aspirated cascades studied, the tip leakage loss decreased as tip clearance dimension increased, which was opposite to the results of conventional compressor cascade. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：边界层抽吸（BLS）或抽吸，是消除流动分离的有效方法，并改善轴向压缩机中的刀片装载。本研究的目的是揭示吸入压缩机级联尖端泄漏涡流的流量物理和损失机制，其在扩散因子下的多重加载水平范围为0.42至0.71。基于三个吸气刀片，在数值上进行了数量地研究了尖端泄漏流对尖端泄漏流的影响，包括用常规方法设计的叶片，以及用曲率诱导的压力回收设计的另一个。研究了尖端间隙尺寸和BLS方案（BLS位置，BLS高度和BLS质量流量）对尖端泄漏涡流以及其击穿机构的影响。结果表明，在具有常规方法和曲率诱导压力恢复概念设计的吸气压缩机级联中发现了伪冲击。与传统的压缩机刀片相比，吸气压缩机叶片的尖端泄漏流动的主流现象是由BLS引入的强不利的压力梯度引起的尖端泄漏涡流击穿（TLVB）。在常规装载的压缩机级联和高负载压缩机级联中，TLVB现象均发生在内。对于常规装载的刀片，由于尖端泄漏涡流的强度增加，TLVB现象发生在低尖端间隙条件下，但在高尖端间隙条件下消失。降低BLS质量流量导致较弱的伪冲击，这减少了尖端泄漏涡流的旋流数，并改善了涡流分解现象。高负荷级联的涡流破坏是由高叶片装载和伪休克的关节作用产生的。伪震靠近刀片后缘靠近刀片后缘，导致漏气质量较高，但承诺优越的尖端泄漏流场。对于所研究的所有吸气式级联，随着尖端间隙尺寸的增加，尖端泄漏损失减小，这与传统压缩机级联的结果相反。 （c）2021 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2021年第6期|106692.1-106692.16|共16页
  • 作者

    Cao Zhiyuan; Zhang Xiang; Zhang Fei; Song Cheng; Gao Xi; Liu Bo;

  • 作者单位

    Northwestern Polytech Univ Sch Power & Energy Xian Shaanxi Peoples R China;

    Northwestern Polytech Univ Sch Power & Energy Xian Shaanxi Peoples R China;

    Northwestern Polytech Univ Sch Power & Energy Xian Shaanxi Peoples R China;

    Northwestern Polytech Univ Sch Power & Energy Xian Shaanxi Peoples R China;

    Northwestern Polytech Univ Sch Power & Energy Xian Shaanxi Peoples R China;

    Northwestern Polytech Univ Sch Power & Energy Xian Shaanxi Peoples R 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

    Aspirated compressor; Tip leakage vortex; Tip leakage vortex breakdown; Boundary layer suction;

    机译：吸气式压缩机;尖端泄漏涡旋;尖端泄漏涡流击穿;边界层抽吸;

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