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Stall inception in a high-speed axial compressor.

机译：在高速轴向压缩机中失速开始。

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摘要

A research program designed to provide understanding of the fluid dynamic mechanisms that lead to rotating stall in the Notre Dame Stage 01 high-speed axial compressor is described. The stalling behavior of this compressor was studied with unsteady casing pressure measurements from a circumferentially spaced array of sensors. In addition, over rotor casing surface streak measurements were performed to investigate the time-averaged end-wall flow near the rotor at operating points near stall.;Several investigative tools were applied to the analysis and interpretation of the unsteady casing pressure data. Traditional methods such as visual inspection, spatial Fourier decomposition, traveling wave energy and wavelet analysis were shown to be insufficient to characterize the pre-stall and stall inception behavior of the compressor. A new technique based on a windowed two-point correlation between adjacent sensors was developed and demonstrated to provide spatial and temporal resolution of both pre-stall and stall inception behavior.;The spatial correlation technique was then applied to the analysis of stall inception data from experiments with asymmetric tip clearance. The non-uniform tip clearance was produced using the magnetic bearings which levitate the rotor shaft of the Notre Dame Transonic Axial Compressor facility. Both steady rotor centerline offset and rotor whirl were investigated. The results of these experiments, along with the surface streak measurements, provide evidence in support of recent computational observations (found in the literature) that predict that short length scale stall inception is related to specific features of the rotor tip clearance flow.
机译：描述了一个研究程序，旨在提供对导致Notre Dame Stage 01高速轴向压缩机旋转失速的流体动力学机制的理解。通过使用沿周向间隔排列的传感器的不稳定壳体压力测量值研究了该压缩机的失速行为。此外，还对转子壳体上的表面条纹进行了测量，以研究失速附近工作点转子附近端壁的时间平均数。运用了几种调查工具来分析和解释不稳定的壳体压力数据。传统方法，如目视检查，空间傅立叶分解，行波能量和小波分析显示不足以表征压缩机的失速和失速起始行为。开发了一种基于相邻传感器之间的窗口两点相关性的新技术，并证明了该技术可提供失速前和失速开始行为的时空分辨率;然后将空间相关技术用于分析来自失速的失速开始数据不对称尖端间隙的实验。磁悬浮轴承使Notre Dame Transonic轴向压缩机的转子轴悬浮，产生了不均匀的叶尖间隙。研究了稳定的转子中心线偏移和转子涡流。这些实验的结果以及表面条纹的测量结果提供了证据，以支持最近的计算观察（可在文献中找到），这些观察预测短尺度的失速开始与转子叶尖间隙流动的特定特征有关。

著录项

  • 作者

    Cameron, Joshua David.;

  • 作者单位

    University of Notre Dame.;

  • 授予单位 University of Notre Dame.;
  • 学科 Engineering Aerospace.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 132 p.
  • 总页数 132
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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