Acoustic imaging of the broadband noise arising in contra-rotating co-axial propellers

Wangqiao Chen, Zhida Ma, Etienne Spieser, Jingwen Guo, Peng Zhou, Siyang Zhong, Xin Zhang, Xun Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review


The interaction between two contra-rotating co-axial propellers leads to variations in noise strength during the rotation and presents challenges for traditional acoustic measurement methods. In this work, we propose using a wavelet-based beamforming method to study the transient noise generation characteristics of the contra-rotating co-axial propellers. Compared to the conventional beamforming method, the wavelet-based beamforming method can address unsteady and high-speed moving noise sources in the time-frequency domain. A representative set-up is considered herein. The acoustic imaging results show that the transient noise sources increase after the overlap of the propellers and are dominant on the aft propeller, particularly at high frequencies and low rotating speeds. At relatively high rotating speeds, the results show that the contra-rotating propellers noise can be generated at the trailing edge near the hub of the propellers. Overall, the wavelet-based beamforming method deepens the physical understanding of transient aerodynamic and aeroacoustic processes, and could find applications in the design of low-noise contra-rotating propellers.

Original languageEnglish
Article number108531
JournalAerospace Science and Technology
Publication statusPublished - Oct 2023


  • Aeroacoustic measurement
  • Beamforming
  • Contra-rotating propellers
  • Wavelet

ASJC Scopus subject areas

  • Aerospace Engineering


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