Aeroacoustic characteristics of slat finlets

Hasan Kamliya Jawahar*, Syamir Alihan Showkat Ali, Mahdi Azarpeyvand

*Corresponding author for this work

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

8 Citations (Scopus)
90 Downloads (Pure)


An experimental study was performed on a 30P30N three-element high-lift airfoil fitted with different types of slat finlets and its noise reduction capabilities were assessed. To develop a better understanding of the noise reduction mechanism, simultaneous measurements of the unsteady surface pressure were taken at various locations at the vicinity of the slat cove and at far-field locations. While there was a small reduction in far-field noise for the fundamental peak, the use of slat finlets showed a substantial reduction in surface pressure fluctuations. The reduction of vortex shedding energy by the slat finlets also resulted in the reduction of nonpropagating hydrodynamic field between the slat and the main-element substantially reducing the near-field pressure spectra. Fourier and wavelet-based analysis along with high-order spectral analysis were provided for further confirmation of the observations and hypothesis. Finally, the wavelet coefficient findings showed spectral peaks as well as amplitudes modulated in time in the baseline case; however, these peaks were substantially reduced for the finlet configuration with larger spacing
Original languageEnglish
Article number097102
Number of pages18
JournalPhysics of Fluids
Issue number9
Early online date9 Sept 2021
Publication statusE-pub ahead of print - 9 Sept 2021

Bibliographical note

Funding Information:
This research was sponsored by EU H2020 ARTEM project under the Grant Agreement ID 769359. We would like to acknowledge Felix Gstrein for designing and manufacturing the 3D printed slat finlets.

Publisher Copyright:
© 2021 Author(s).


  • high lift airfoil
  • 30P30N
  • finlets
  • noise
  • aeroacoustics


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