Control of Separations in a Highly-Loaded Axial Compressor Cascade by Tailored Boundary Layer Suction-猫眼课题宝

DOI：

10.1115/gt2015-42015

发表时间：

2015-06

期刊：

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中科院分区：

其他

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作者：

X. Mao;Bo Liu;Guochen Zhang

为了研究边界层吸力(BLS)对整个吸力面(SS)的边界层分离和转角的三维分离的控制效果及其机理，采用定制的边界层吸力(BLS)对一个三维线性压气机叶栅进行了研究。首先，在高亚声速叶栅风洞中，对原始叶栅和吸气叶栅进行了−10°~10°攻角范围内的实验研究。结果表明，在−角为5°~8°的情况下，吸气叶栅的叶型损失系数随吸力比的增大而显著减小。在实验研究的基础上，采用数值模拟的方法对原始叶栅和吸气叶栅的流场进行了详细的研究。结果表明，在吸气叶栅上采用部分叶距吸力可以有效地消除吸力槽所在吸力跨度处的分离，从而导致其他跨度的流场恶化；由于SS和端壁分离的相互作用，角部的三维分离更加复杂，因此为了完全消除SS上的边界层分离和三维分离，设计了另外三种定制的BLS方案。结果表明，吸气后静压在跨中方向的分布发生了变化，影响了低能流体在端壁和跨中之间的输运。联合吸引法(CS)完全消除了SS的全程分离和角部3D分离。最后，数值研究了CS格式控制下的三维线性叶栅的入射特性，以及不同吸力缝隙的吸力流量匹配问题

In order to study the effectiveness and mechanisms of boundary layer suction (BLS) in controlling both the boundary layer separation on the whole span of suction surface (SS) and the three-dimensional (3D) separation in the corner, a 3D linear compressor cascade was investigated by tailored BLS. First, experimental investigations at a range of incidences from −10° to 10° were undertaken on both the original cascade and the aspirated cascade (SS1) in a high-subsonic cascade wind tunnel. The results show that the profile loss coefficient of the aspirated cascade is reduced remarkably as the suction flow ratio increases at the incidences from −5° to 8°. Based on the experimental investigations, numerical simulations were employed to study the flow fields of the original and aspirated cascade in detail. It was found that part blade span suction on the aspirated cascade can effectively remove the separation at the suction span where suction slot exists, resulting that the flow fields of other spans deteriorated.Due to the interaction of separations both on the SS and the end-wall, the 3D separation in the corner are more complicated, so another three tailored BLS schemes were designed totally in order to fully remove both the boundary-layer separation on SS and the 3D separation. It was found that the span-wise distribution of static pressure was changed after suction and it could influence the transport of the low-energy fluid between the end-wall and the mid-span. The separation over the whole span of SS and the 3D separation in the corner were fully eliminated by combined suction scheme (CS). Finally, the incidence characteristics of the 3D linear cascade under the control of CS scheme were investigated numerically together with the suction flow rate matching problem of the different suction slots.Copyright © 2015 by ASME

Control of Separations in a Highly-Loaded Axial Compressor Cascade by Tailored Boundary Layer Suction

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