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首页> 外文期刊>Aerospace science and technology >Experimental study of the Critical Incidence Phenomena in low speed compressor stators with both conventional and 3D blading designs
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Experimental study of the Critical Incidence Phenomena in low speed compressor stators with both conventional and 3D blading designs

机译：常规和3D叶片设计的低速压缩机定子的临界入射现象的实验研究

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Three-dimensional (3D) corner separation, which can arise significant flow blockage and loss production, is an inherent and detrimental flow feature inside the stator of axial compressors, hence, numerous active and passive methods have been investigated to prevent the corner separation turning into corner stall in recent years. This paper investigates experimentally the 3D separating flows and the Critical Incidence Phenomenon inside the stator passage of a series of low-speed large-scale axial compressors with or without 3D blading designs, and it is expected that some rules for design of highly loaded stator could be found. Firstly, the experimentally observed Critical Incidence Phenomenon in the previous study was reviewed, and this phenomenon was validated in the other compressors with different design parameters. Then, the effects of blade loading, blade airfoils, and 3D blading designs on the critical incidence were discussed. And the results revealed that blade loading and 3D blading designs seem to have no impact on the critical incidence, while blade airfoils should be considered as an impact factor on it. Besides, though 3D blading designs could not increase the critical incidence, it can reduce the actual inlet incidence instead, hence, after the stator is redesigned using the 3D stacking, the corner stall is delayed. Finally, based on the above-mentioned analysis, a critical-incidence-based metric named Incidence Reserve was proposed to guide the design of the highly loaded stator. It is expected that at the initial stage of a stator the distribution of the Incidence Reserve along the span is as consistent as possible, so that the detrimental hub corner stall will be eliminated or deferred. (C) 2020 Elsevier Masson SAS. All rights reserved.
机译：三维（3D）角分离可能会造成严重的流量阻塞和损失，它是轴向压缩机定子内部固有的有害流特征，因此，人们研究了许多主动和被动方法来防止角分离变成近年来转角失速。本文通过实验研究了一系列带有或不带有3D叶片设计的低速大型轴流式压缩机的定子通道内的3D分离流和临界入射现象，并有望为高负荷定子设计提供一些规则被发现。首先，回顾了先前研究中实验观察到的临界入射现象，并在具有不同设计参数的其他压缩机中验证了该现象。然后，讨论了叶片载荷，叶片翼型和3D叶片设计对临界入射角的影响。结果表明，叶片载荷和3D叶片设计似乎对临界入射角没有影响，而应将叶片翼型视为对其影响的因素。此外，尽管3D叶片设计不能增加临界入射角，但它可以减少实际的入口入射角，因此，在使用3D堆叠重新设计定子后，转角失速被延迟了。最后，在上述分析的基础上，提出了基于临界事故的指标“事故储备”，以指导高负荷定子的设计。可以预期，在定子的初始阶段，入射储备沿跨度的分布应尽可能一致，以便消除或推迟有害的轮毂转角失速。 （C）2020 Elsevier Masson SAS。版权所有。

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