Rotating Instability Characteristics in Compressor with
 Different Tip Clearances

doi:10.16183/j.cnki.jsjtu.2020.03.006

Abstract

Abstract: Rotating instability (RI) characteristics of a single stage low speed compressor are analyzed by full channel numerical calculation method. Variations and the reasons of frequency characteristics, modes characteristics and flow characteristics of RI under four different tip clearances are investigated. The coherence analysis method is used to obtain the coherent function and the mutual power spectrum of the pressure signal at the same angle in the adjacent blade channel, which show the propagation characteristics of the channel vortex structure with flow in the circumferential direction. The circumferential modal characteristics of RI, the pulsating and rotating characteristics of channel vortex structures affecting RI as well as its relationship in absolute and relative coordinate systems are obtained by spatial mode decomposition and rotation source mechanism analysis. Results show that with the decrease of tip clearance, the flow intensity of tip clearance decreases, the intensity of RI gradually decreases, and the order of main modes increases.

Key words: rotating instability (RI); numerical simulation; tip clearance flow; rotating source mechanism; circumferential mode

CLC Number:

V 231.3

LAI Shengzhi，WU Yadong，TIAN Jie，OUYANG Hua. Rotating Instability Characteristics in Compressor with Different Tip Clearances[J]. Journal of Shanghai Jiaotong University, 2020, 54(3): 265-276.

References

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Rotating Instability Characteristics in Compressor with Different Tip Clearances

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