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INVESTIGATION OF BLADE TIP INTERACTION WITH CASING TREATMENT IN A TRANSONIC COMPRESSOR: PART 1 - PARTICLE IMAGE VELOCIMETRY

机译：跨音压缩机壳体处理的叶片尖端相互作用的研究：第1部分 - 粒子图像速度

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A single-stage transonic axial compressor was equipped with a casing treatment (CT), consisting of 3.5 axial slots per rotor pitch in order to investigate the predicted extension of the stall margin characteristics both numerically and experimentally. Contrary to most other studies the CT was designed especially accounting for an optimized optical access in the immediate vicinity of the CT, rather than giving maximum benefit in terms of stall margin extension. Part 1 of this two-part contribution describes the experimental investigation of the blade tip interaction with casing treatment using Particle image velocimetry (PIV). The nearly rectangular geometry of the CT cavities allowed a portion of it to be made of quartz glass with curvatures matching the casing. Thus the flow phenomena could be observed with essentially no disturbance caused by the optical access. Two periscope light sheet probes were specifically designed for this application to allow for precise alignment of the laser light sheet at three different radial positions in the rotor passage (87.5%, 95% and 99%). For the outermost radial position the light sheet probe was placed behind the rotor and aligned to pass the light sheet through the blade tip clearance. It was demonstrated that the PIV technique is capable of providing velocity information of high quality even in the tip clearance region of the rotor blades. The chosen type of smoke-based seeding with very small particles (about 0.5 μm in diameter) supported data evaluation with high spatial resolution, resulting in a final grid size of 0.5 × 0.5 mm. The PIV data base established in this project forms the basis for further detailed evaluations of the flow phenomena present in the transonic compressor stage with CT and allows validation of accompanying CFD calculations using the TRACE code. Based on the combined results of PIV measurements and CFD calculations of the same compressor and CT geometry a better understanding of the complex flow characteristics can be achieved, as detailed in Part 2 of this paper.
机译：单级延长型轴向压缩机配备有壳体处理（CT），由每个转子间距的3.5轴向槽组成，以便在数值和实验上研究失速幅度特性的预测延伸。与大多数其他研究相反，CT的设计特别占CT的直接附近的优化光学访问，而不是在失速的边距扩展方面提供最大益处。该两部分贡献的第1部分描述了使用粒子图像速度（PIV）与壳体处理的叶片尖端相互作用的实验研究。 CT腔的几乎矩形几何形状允许其中的一部分由曲率玻璃制成，其中曲率与壳体匹配。因此，可以观察到流动现象，基本上没有由光学访问引起的扰动。专为该应用设计了两种潜望镜光片探针，以允许激光片在转子通道（87.5％，95％和99％）中的三个不同的径向位置进行精确对准。对于最外侧的径向位置，将光片探针放置在转子后面并对对准以通过刀片尖端间隙通过光片。结果证明，PIV技术能够在转子叶片的尖端间隙区域中提供高质量的速度信息。所选择的基于烟碱的种子，具有非常小的颗粒（直径约0.5μm）支持的数据评估，具有高空间分辨率，导致最终网格尺寸为0.5×0.5mm。在该项目中建立的PIV数据库构成了具有CT的跨音速压缩机级中存在的流动现象的进一步详细评估的基础，并允许使用跟踪代码验证伴随的CFD计算。基于PIV测量的组合结果和相同压缩机的CFD计算和CT几何形状，可以更好地理解复杂的流动特性，如本文的第2部分所述。

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