Effect of porous surface on the flat plate self-noise

Youngmin Bae, Ye Eun Jeong, Young June Moon

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

16 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)
Publication statusPublished - 2009 Dec 1
Event15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference) - Miami, FL, United States
Duration: 2009 May 112009 May 13

Other

Other15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference)
CountryUnited States
CityMiami, FL
Period09/5/1109/5/13

Fingerprint

Large eddy simulation
Vortex shedding
Acoustic fields
Angle of attack
Noise abatement
Navier Stokes equations
Turbulent flow
Porosity
Acoustic waves
Scattering

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering

Cite this

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]

Effect of porous surface on the flat plate self-noise. / Bae, Youngmin; Jeong, Ye Eun; Moon, Young June.

15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference). 2009. 2009-3311.

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

Bae, Y, Jeong, YE & Moon, YJ 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), Miami, FL, United States, 09/5/11.
Bae Y, Jeong YE, Moon YJ. Effect of porous surface on the flat plate self-noise. In 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference). 2009. 2009-3311
Bae, Youngmin ; Jeong, Ye Eun ; Moon, Young June. / Effect of porous surface on the flat plate self-noise. 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference). 2009.
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