Intermittency analysis of high-lift airfoil with slat cove fillers

Hasan Kamliya Jawahar*, Stefano Meloni, Mahdi Azarpeyvand, Roberto Camussi

*Corresponding author for this work

Research output: Contribution to conferenceConference Paper

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Abstract

Experimental measurements were carried out to assess the aeroacoustic characteristics of 30P30N airfoil fitted with two different types of slat cove fillers at the aeroacoustic facility at the University of Bristol. The results are presented for the angle of attack α = 18◦ at a free-stream velocity of U∞ = 30 m/s which corresponds to a chord-based Reynolds number of Rec = 7 × 10◦ . Simultaneous measurements of the unsteady surface pressure were made at several locations in the vicinity of slat cove and at the far-field location to gain a deeper understanding of the slat noise generation mechanism. The results are analyzed using a higher-order statistical approach to determine the nature of the broadband hump seen at low-frequency for the 30P30N high-lift airfoil observed in recent studies and also to further understand the tone generation mechanism within the slat cavity. A series of cross-correlation and coherence of the unsteady pressure measurements are carried out to identify and isolate the low-frequency hump. Wavelet analysis is performed to investigate the nature of the slat-wing resonant intermittent events in both time and frequency domains. The far-field noise measurement results showed that significant noise reduction can be achieved by the use of slat cove fillers. A series of far-field and near-field correlation are also presented to show the propagated noise from the slat.
Original languageEnglish
DOIs
Publication statusPublished - 15 Jun 2020
EventAIAA Aviation Forum 2020 - Online, United States
Duration: 15 Jun 202019 Jun 2020
https://www.aiaa.org/aviation

Conference

ConferenceAIAA Aviation Forum 2020
CountryUnited States
Period15/06/2019/06/20
Internet address

Keywords

  • 30P30N
  • Slat
  • serration
  • slat cove filler
  • slat noise

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