The aeroacoustics of high-lift slat under the effect of pressure fluctuations

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Lo-speed wind tunnel measurements and numerical simulations of unsteady surface pressures on a wing-slat configuration are presented. The unsteady pressures are incorporated into the acoustic formulation of Lighthill & Curle to calculate the level of noise radiated into the far-field. Three main noise characteristics of the slat are identified as: 1) vortex shredding from the slat's trailing edge (high-frequency tonal noise): 2) radiation): 3 low-mid frequency noise originated from the instabilities in the shear layer inside the cove region. The vortex shredding that usually occurs at low amplitudes is a noise source that contains both dipoles and quadrupoles. The unsteady fluctuations contain dipole sources of sound and the cove region noise mechanism includes mainly mechanism ( pressure fluctuations), the effect of visco-elastic coating was investigated. It was found that the level of fluctuations was damped by almost 600 Pa, corresponding to about 3dB in noise levels.
Original languageEnglish
Title of host publication50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition,
ISBN (Electronic)9781600869365
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition - Nashville, United States
Duration: 9 Jan 201212 Jan 2012

Conference

Conference50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition
CountryUnited States
CityNashville
Period9/01/1212/01/12

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  • Cite this

    Rakhshani, B. (2012). The aeroacoustics of high-lift slat under the effect of pressure fluctuations. In 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, [2012-0384] https://doi.org/10.2514/MASM12