Slat Noise Suppression Using Upstream Mass Injection

A new approach,mass injection near the slat cusp,is proposed for the suppression of slat noise.The mechanism and efciency of the slat noise suppression using upstream mass injection are numerically studied with hybrid Reynolds-averaged Navier-Stokes simulation/Large eddy simulation（RANS/LES）of a thr...

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Bibliographic Details
Published inShanghai jiao tong da xue xue bao Vol. 18; no. 5; pp. 620 - 629
Main Author 黄华 李伟鹏 王福新
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.10.2013
Subjects
Architecture
Computer Science
Cusps
Electrical Engineering
Engineering
Large eddy simulation
Life Sciences
Materials Science
Mathematical models
Navier-Stokes equations
Navier-Stokes方程
Noise
RANS
Shear layers
Slats
Upstream
上游
噪声抑制
板条
模型模拟
空气动力性能
雷诺平均
slat noise
upstream mass injection
detached-eddy-simulation (DES)
V 211.41
Online AccessGet full text
ISSN1007-1172
1995-8188
DOI10.1007/s12204-013-1432-z

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Summary:A new approach,mass injection near the slat cusp,is proposed for the suppression of slat noise.The mechanism and efciency of the slat noise suppression using upstream mass injection are numerically studied with hybrid Reynolds-averaged Navier-Stokes simulation/Large eddy simulation（RANS/LES）of a three-component high-lift model.Ffowcs-Williams and Hawking（FW-H）integration is employed to obtain far-field acoustic characteristics.Results show that with injection,aerodynamic capability of the high-lift devices is sustained.In addition,a considerable noise reduction is observed in the downward direction.With detailed analysis of the time-averaged and instantaneous flow fields,two mechanisms are identified as the reason accounting for the noise suppression：upstream mass injection significantly reduces the scale and strength of the vortices stemming from the cusp;the shear layer is lifted up,which relieves the shear layer impingement on the slat lower surface.
Bibliography:HUANG Hua , LI Wei-peng, WANG Fu-xin＊ （School of Aeronautics and Astronautics, Shanghai Jiaotong University, Shanghai 200240, China）
31-1943/U
A new approach,mass injection near the slat cusp,is proposed for the suppression of slat noise.The mechanism and efciency of the slat noise suppression using upstream mass injection are numerically studied with hybrid Reynolds-averaged Navier-Stokes simulation/Large eddy simulation（RANS/LES）of a three-component high-lift model.Ffowcs-Williams and Hawking（FW-H）integration is employed to obtain far-field acoustic characteristics.Results show that with injection,aerodynamic capability of the high-lift devices is sustained.In addition,a considerable noise reduction is observed in the downward direction.With detailed analysis of the time-averaged and instantaneous flow fields,two mechanisms are identified as the reason accounting for the noise suppression：upstream mass injection significantly reduces the scale and strength of the vortices stemming from the cusp;the shear layer is lifted up,which relieves the shear layer impingement on the slat lower surface.
slat noise upstream mass injection detached-eddy-simulation（DES）
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ISSN:1007-1172
1995-8188
DOI:10.1007/s12204-013-1432-z