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 language | English |
|---|---|
| Title of host publication | 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference) |
| Publication status | Published - 2009 Dec 1 |
| Event | 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference) - Miami, FL, United States Duration: 2009 May 11 → 2009 May 13 |
Other
| Other | 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference) |
|---|---|
| Country | United States |
| City | Miami, FL |
| Period | 09/5/11 → 09/5/13 |
Fingerprint
ASJC Scopus subject areas
- Aerospace Engineering
- Mechanical Engineering
Cite this
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 proceeding › Conference contribution
}
TY - GEN
T1 - Effect of porous surface on the flat plate self-noise
AU - Bae, Youngmin
AU - Jeong, Ye Eun
AU - Moon, Young June
PY - 2009/12/1
Y1 - 2009/12/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=78149438647&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78149438647&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:78149438647
SN - 9781563479748
BT - 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference)
ER -