Effects of number of blades on propeller noise

Kabilan Baskaran*, Nur Syafiqah Jamaluddin, Alper Celik, Djamel Rezgui, Mahdi Azarpeyvand

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

3 Citations (Scopus)


This paper presents the effect of the number of blades on the aeroacoustic characteristics and aerodynamic performance of propellers utilized in urban air mobility vehicles through an extensive experimental study. A detailed parametric study is conducted for two, three, and five-bladed propellers. Investigations are carried out under static thrust conditions and incoming axial flow velocities for various rotational speeds. The spectra and directivity of the far-field noise are studied in detail for broadband and tonal components. Results show that two-bladed propellers produce higher tonal noise levels than other blade numbers for the same tip speed, while five-bladed propellers produce the highest broadband noise levels. The highest level of noise radiation is noted in the upstream and downstream directions for broadband noise, whereas tonal noise is radiated mainly in the plane of rotation. Results also indicate that high-frequency broadband humps are observed for higher advance ratios, likely caused by the formation of laminar separation bubbles, and that amplitude increases with blade numbers. The results of this study provide valuable insight for further investigations of propeller noise and aerodynamic performance.
Original languageEnglish
Article number118176
Number of pages17
JournalJournal of Sound and Vibration
Early online date15 Nov 2023
Publication statusPublished - 3 Mar 2024

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Ltd

Structured keywords

  • Wind Tunnel
  • Aeroacoustics


  • Rotor noise
  • Aeroacoustics
  • Tilt rotor
  • Wind tunnel experiment
  • Urban air mobility


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