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Vortex sound theory suggests that the dipole associated with the Lamb vector is the main source of aerodynamic sound in compressor application scenarios. The distribution and strength of this dipole and its splitting subterms are further analyzed by the URANS calculation of the flow field of an axial compressor. These results are interpreted in terms of the Gaussian distribution of the wake velocity. The variational formulation of the vortex sound equation, supporting a modal boundary condition at the inlet and a non-reflecting boundary condition at the outlet, is applied to predict the radiated acoustic field of the compressor. The tonal signals at the microphone array placement determined by the duct modes agree well with the experimental measurements.

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Identifying the Radiating Core and Predicting the Tonal Noise Radiation of an Axial Compressor

  • 会议论文

  • 发表日期：

    2026年

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  • Xiao Jing,
  • Xiaocheng Zhu,
  • Zhaohui Du

摘要

Vortex sound theory suggests that the dipole associated with the Lamb vector is the main source of aerodynamic sound in compressor application scenarios. The distribution and strength of this dipole and its splitting subterms are further analyzed by the URANS calculation of the flow field of an axial compressor. These results are interpreted in terms of the Gaussian distribution of the wake velocity. The variational formulation of the vortex sound equation, supporting a modal boundary condition at the inlet and a non-reflecting boundary condition at the outlet, is applied to predict the radiated acoustic field of the compressor. The tonal signals at the microphone array placement determined by the duct modes agree well with the experimental measurements.