Aeroacoustic Analysis of Slat Tones

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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)


High-lift device noise is one of the dominant airfram noise sources. Small scale experimental studies have show characteristic tonal behavior in slat noise. In the present study experiments were carried out to assess the aeroacoustic characteristics of a 30P30N high-lift device, with particular attention to this slat tonal noise. Three different types of slat modifications, namely slat cove filler, serrated slat cusp, and slat finlets have been experimentally examined. The results are presented for an angle of attack of α = 18◦ at a free-stream velocity of U∞ = 30 m/s, which corresponds to a chord-based Reynolds number of Rec = 7 × 105. The unsteady surface pressure near the slat region and far-field noise were made simultaneously to gain a deeper understanding of the slat noise generation mechanisms. The nature of the low-frequency broadband hump and the slat tones were investigated using higher-order statistical approaches for the baseline 30P30N and modified slat configurations. Continuous wavelet transform of the unsteady surface pressure fluctuations along with secondary wavelet transform of the broadband hump and tones were carried out to analyze the intermittent events induced by the tone generating resonant mechanisms. An understanding into the nature of the noise generated from the slat will help design the new generation of quite high-lift devices.
Original languageEnglish
Title of host publicationProceedings of INTER-NOISE 2021 - 2021 International Congress and Exposition of Noise Control Engineering
Subtitle of host publicationInterNoise21
EditorsTyler Dare, Stuart Bolton, Patricia Davies, Yutong Xue, Gordon Ebbitt
PublisherInstitute of Noise Control Engineering
ISBN (Electronic)9781732598652
ISBN (Print)07362935
Publication statusPublished - 1 Aug 2021

Publication series

NameProceedings of INTER-NOISE 2021 - 2021 International Congress and Exposition of Noise Control Engineering

Bibliographical note

Publisher Copyright:
© INTER-NOISE 2021 .All right reserved.


  • aeroacoustics
  • slat noise
  • tones
  • high lift airfoil


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