scholarly journals Trailing-edge noise prediction using synthetic turbulence and acoustic perturbation equations in a hybrid methodology

2017 ◽  
Author(s):  
Ali Kadar ◽  
Paula Martinez-Lera ◽  
Christophe F. Schram ◽  
Wim De Roeck ◽  
Wim Desmet ◽  
...  
Keyword(s):  
Noise Prediction ◽  
Trailing Edge ◽  
Trailing Edge Noise ◽  
Acoustic Perturbation ◽  
Hybrid Methodology ◽  
Perturbation Equations

scholarly journals Prediction of flow-control devices' noise with modified acoustic perturbation equations

2020 ◽  
Vol 22 (3) ◽  
pp. 619-627
Author(s):  
Luca Fenini ◽  
Stefano Malavasi
Keyword(s):  
Flow Control ◽  
Fluid Dynamic ◽  
International Standards ◽  
The Other ◽  
Computational Time ◽  
Noise Prediction ◽  
Acoustic Perturbation ◽  
Flow Control Devices ◽  
Control Devices ◽  
Perturbation Equations

Abstract Fluid-dynamic noise emissions produced by flow-control devices inside ducts are a concerning issue for valve manufacturers and pipeline management. This work proposes a modified formulation of Acoustic Perturbation Equations (APE) that is applicable to industrial frameworks where the interest is addressed to noise prediction according to international standards. This formulation is derived from a literature APE system removing two terms allowing for a computational time reduction of about 20%. The physical contribution of the removed terms is discussed according to the literature. The modified APE are applied to the prediction of the noise emitted by an orifice. The reliability of the new APE system is evaluated by comparing the Sound Pressure Level (SPL) and the acoustic pressure with the ones returned by LES and literature APE. The new formulation agrees with the other methods far from the orifice: moving over nine diameters downstream of the trailing edge, the SPL is in accordance with the other models. Since international standards characterize control devices with the noise measured 1 m downstream of them, the modified APE formulation provides reliable and faster noise prediction for those devices with outlet diameter, d, such that 9d < 1 m.

Fan Blade Trailing‐Edge Noise Prediction Using RANS Simulations

2008 ◽  
Vol 123 (5) ◽  
pp. 3688-3688 ◽  
Author(s):  
Yannick Rozenberg ◽  
Michel Roger ◽  
Stéphane Moreau
Keyword(s):  
Noise Prediction ◽  
Trailing Edge ◽  
Trailing Edge Noise ◽  
Rans Simulations ◽  
Fan Blade
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