Effect of porous surface on the flat plate self-noise

Youngmin Bae, Ye Eun Jeong, Young J. Moon

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

17 Citations (Scopus)

Abstract

In this study, the effect of porous surface on the turbulent noise generated by a blunt trailing-edge of a flat plate is investigated. The three-dimensional turbulent flow over the flat plate (Rec=1. 3×105 and M=0.06) is computed by incompressible large eddy simulation (LES) based on the volume-averaged Navier-Stokes equations, while the acoustic field is calculated by the linearized perturbed compressible equations (LPCE) coupled with LES solutions. The porous surface is applied to a small, selected area near the trailing-edge, where the Kármán vortex shedding and eddy scattering produce dipole sounds. The computed results show that the trailing-edge with porosity ε=0.25 and permeability (normalized) K*=0.01 yields a reduction of tonal peak by 13dB for zero angle of attack (α=0°), via breaking not only in the streamwise direction but also in the spanwise direction the spatial correlation of the wall pressure fluctuations (Rpp) near the trailing-edge. For the separated flow case (α=5°), the same configuration of the porous surface is found to weaken the pressure fluctuations at the trailing edge. It results in 3-10dB noise reduction over a wide range of frequency, via reducing the separated flow region over the upper surface of the plate.

Original languageEnglish
Title of host publication15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference)
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781563479748
DOIs
Publication statusPublished - 2009

Publication series

Name15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference)

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering

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    Bae, Y., Jeong, Y. E., & Moon, Y. J. (2009). Effect of porous surface on the flat plate self-noise. In 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference) [2009-3311] (15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference)). American Institute of Aeronautics and Astronautics Inc.. https://doi.org/10.2514/6.2009-3311