Volume 35 Issue 8
Aug.  2020
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Article Navigation >  Journal of Aerospace Power  > 2020  >  35(8): 1768-1776
WU Wei, ZHAO Bo, XUE Xiang. Time-frequency analysis of unsteady flow in centrifugal compressor[J]. Journal of Aerospace Power, 2020, 35(8): 1768-1776. doi: 10.13224/j.cnki.jasp.2020.08.022
Citation: WU Wei, ZHAO Bo, XUE Xiang. Time-frequency analysis of unsteady flow in centrifugal compressor[J]. Journal of Aerospace Power, 2020, 35(8): 1768-1776. doi: 10.13224/j.cnki.jasp.2020.08.022
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Time-frequency analysis of unsteady flow in centrifugal compressor

doi: 10.13224/j.cnki.jasp.2020.08.022

  • School of Mechanical Engineering,Shanghai Jiaotong University,Shanghai 200240,China

  • Received Date: 2019-12-23
  • Publish Date: 2020-08-28
    Abstract
  • Improving the reliability of centrifugal compressor operation requires accurate acquisition of time-frequency characteristics. Based on the dynamic pressure data acquired at the impeller outlet when the high-speed centrifugal compressor with vaneless diffuser approached the unsteady condition, spatiotemporal intrinsic mode decomposition (STIMD) and empirical mode decomposition (EMD) were used to obtain the intrinsic mode functions (IMF). Combining Hilbert transform, the dynamic characteristics of unsteady flow were analyzed. By STIMD algorithm, the time-frequency information of deep surge and mild surge was obtained. The phenomenon of stall with continuous fluctuation frequency around 150 Hz was observed, whilst the transition of frequency curve of mild surge precursor from oscillating to constant state was found. STIMD algorithm has improved the modal aliasing problem of EMD, thus providing a tool for compressor stability analysis.

     

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