An Experimental Study on the Reduction of Airfoil Trailing-edge Noise Using a Single-Leg Spiral Array in an Anechoic Wind Tunnel

2017 ◽  
Author(s):  
Weijie Chen ◽  
Weiyang Qiao ◽  
Liangfeng Wang ◽  
Fan Tong ◽  
Cheng Haoyi
Keyword(s):  
Experimental Study ◽  
Wind Tunnel ◽  
Trailing Edge ◽  
Trailing Edge Noise ◽  
Spiral Array

An experimental study of trailing edge noise from a heaving airfoil

2020 ◽  
Vol 147 (6) ◽  
pp. 4020-4031
Author(s):  
Teng Zhou ◽  
Xin Zhang ◽  
Siyang Zhong
Keyword(s):  
Experimental Study ◽  
Trailing Edge ◽  
Trailing Edge Noise

Experimental investigation of porous materials for trailing-edge noise reduction

2020 ◽  
Vol 19 (6-8) ◽  
pp. 365-384
Author(s):  
K-S Rossignol ◽  
A Suryadi ◽  
M Herr ◽  
J Schmidt ◽  
J Tychsen
Keyword(s):  
Wind Tunnel ◽  
Noise Reduction ◽  
Porous Materials ◽  
Active Flow Control ◽  
Acoustic Emissions ◽  
Experimental Investigations ◽  
Trailing Edge ◽  
Trailing Edge Noise ◽  
Tunnel Model ◽  
Close Proximity

The introduction of quiet short take-off and landing for civil aircraft operations in close proximity to the population poses important technological challenges. One critical aspect is the realization of extreme lift augmentation at low acoustic emissions. The aircraft concept selected to achieve this goal is a high-lift system equipped with an active flow-control non-slotted flap and a droop nose. For this specific configuration, trailing edge noise becomes a dominant noise source. Porous materials as a passive means for trailing-edge noise reduction are selected and characterized. Results of extensive experimental investigations in the acoustic wind tunnel Braunschweig are presented and discussed to point out the potential and limitations of the selected porous devices. Practical issues related to material manufacturing and integration into the wind tunnel model are addressed. The noise reduction potential of passive porous trailing-edge devices is found to strongly depend on both these aspects. Issues related to the characterization of the porous materials properties are described. Although porous materials are found to be successful at reducing trailing-edge noise emissions, the results indicate that there is still a need for more generic investigations to further clarify the parametric dependencies between noise reduction and material properties.

An experimental study of trailing edge noise from a pitching airfoil

2019 ◽  
Vol 145 (4) ◽  
pp. 2009-2021 ◽  
Author(s):  
Teng Zhou ◽  
Yuhao Sun ◽  
Ryu Fattah ◽  
Xin Zhang ◽  
Xun Huang
Keyword(s):  
Experimental Study ◽  
Trailing Edge ◽  
Pitching Airfoil ◽  
Trailing Edge Noise
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