Serrated Slat Cusp for High-lift Device Noise Reduction

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

*Corresponding author for this work

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

1 Citation (Scopus)
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Abstract

Noise reduction capabilities of slat cusp serration were experimentally assessed and demonstrated for a 30P30N three-element high-lift airfoil fitted with two different types of serrated slat cusp. Aerodynamic characteristics were evaluated with the aid of surface pressure distribution and insignificant differences were found amongst all the tested configurations. The unsteady flow characteristics of the slat serrations were examined using near- and far-field measurements to gain a deeper understanding of the noise generation mechanism. Although increased surface pressure fluctuations were demonstrated by the slat serrations, a substantial reduction in the far-field noise was observed. The increase in the near-field energy levels was attributed to the non-propagating hydrodynamic energy field within the slat cove and the main-element, whereas the far-field noise reduction was attributed to the elimination of vortex shedding by the slat serration. Further reaffirmation of the observations and hypothesis were provided with higher-order spectral analysis and wavelet analysis.
Original languageEnglish
Article number015107
Number of pages22
JournalPhysics of Fluids
Volume33
Issue number1
DOIs
Publication statusPublished - 5 Jan 2021

Keywords

  • high-lift airfoil
  • 30P30N
  • serration
  • noise reduction
  • higher-order
  • wavelet transform
  • slat noise
  • serrated slat

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