Effect of passive porous surface on the trailing-edge noise

Youngmin Bae, Young June Moon

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

This study numerically investigates the effect of porous surfaces on the turbulent noise generated by a blunt trailing-edge of a flat plate. The three-dimensional turbulent flow over the flat plate (Re c = 1.3 × 10 5 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 (LPCEs) coupled with LES. The porous surface is applied to a small, selected area near the trailing-edge where vortex shedding and edge-scattering of convecting eddies generate dipole noise. The computed results show that the trailing-edge with porosity ε=0.25 and permeability (normalized) K* = 0.01 yields a reduction of the tonal peak by 13 dB for the zero angle of attack (α = °) case, via breaking not only in the streamwise direction but also in the spanwise direction, the spatial correlation of the wall pressure fluctuations near the trailing-edge. For the separated flow case (α = 5°), the porous surface is found to weaken the pressure fluctuations at the trailing-edge and results in 3 ~ 10 dB noise reduction over a wide range of frequency, via interrupting the edge-scattering and reducing the separated flow region over the upper surface of the plate.

Original languageEnglish
Article number126101
JournalPhysics of Fluids
Volume23
Issue number12
DOIs
Publication statusPublished - 2011 Dec 14

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trailing edges
separated flow
Large eddy simulation
large eddy simulation
flat plates
blunt trailing edges
zero angle of attack
Scattering
wall pressure
vortex shedding
Vortex shedding
Acoustic fields
Angle of attack
Noise abatement
noise reduction
scattering
turbulent flow
Navier-Stokes equation
Navier Stokes equations
Turbulent flow

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Effect of passive porous surface on the trailing-edge noise. / Bae, Youngmin; Moon, Young June.

In: Physics of Fluids, Vol. 23, No. 12, 126101, 14.12.2011.

Research output: Contribution to journalArticle

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