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Analysis of the dominant frequency in a subsonic compressor stator at near stall condition

  • Article
  • Fluid Mechanics
  • Published:
Chinese Science Bulletin

Abstract

IDDES method was applied to investigate the highly unsteady flow in a subsonic compressor stator with very large hub clearance and high incidence angle. The blade loading variation frequency was found close to the rotating instability (RI) frequency f RI ≈ 333 Hz observed in the experiment. Detailed analysis of the flow physics shows that the loading variation is caused by the periodic swing of the large scale separated flow on the blade suction side surface. The breakdown of the leakage vortex has no significant dominant frequencies, thus cannot be the cause of RI in this compressor stator as normally believed. Furthermore, the vortex shedding and vortex breakdown due to shear layer instability at the outer edge of the blade suction surface separation region excite high frequency unsteadiness that can form the sources of noise.

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Acknowledgments

The experimental results are kindly provided by the research project partner C. Beselt of the Department of Aeronautics and Astronautics, Technische Universität Berlin. This work was supported by the National Natural Science Fundation of China (10932005, 11272183). Shi Ke would like to thank Prof. Xiao ZhiXiang for the help in the LAST CFD code. Prof. Chen HaiXin also offered valuable comments. Tsinghua National Laboratory for Information Science and Technology provided the supercomputer clusters for the computation.

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Authors and Affiliations

  1. School of Aerospace, Tsinghua University, Beijing, 100084, China

    Ke Shi & Song Fu

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  1. Ke Shi
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  2. Song Fu
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Correspondence to Song Fu.

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Shi, K., Fu, S. Analysis of the dominant frequency in a subsonic compressor stator at near stall condition. Chin. Sci. Bull. 59, 23–28 (2014). https://doi.org/10.1007/s11434-013-0026-3

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  • DOI: https://doi.org/10.1007/s11434-013-0026-3

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