Airfoil flow receptivity to simulated tonal noise emissions

2021 ◽  
Vol 33 (4) ◽  
pp. 044106
Author(s):  
S. Pröbsting ◽  
S. Yarusevych
Keyword(s):  
Tonal Noise ◽  
Airfoil Flow

Effect of tonal noise and task difficulty on electroencephalography and cognitive performance

2021 ◽  
pp. 1-9
Author(s):  
Marzieh Sadeghian ◽  
Saeid Yazdanirad ◽  
Seyed Mahdi Mousavi ◽  
Mohammad Javad Jafari ◽  
Ali Khavanin ◽  
...  
Keyword(s):  
Cognitive Performance ◽  
Task Difficulty ◽  
Tonal Noise ◽  
And Task

scholarly journals Turbomachinery Noise Predictions: Present and Future

Acoustics ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 92-116 ◽  
Author(s):  
Stéphane Moreau
Keyword(s):  
Hybrid Methods ◽  
Free Field ◽  
Broadband Noise ◽  
Large Eddy Simulations ◽  
Analytical Models ◽  
Flat Plates ◽  
Tonal Noise ◽  
Noise Sources ◽  
Large Eddy ◽  
Rans Simulations

In future Ultra-High By-Pass Ratio turboengines, the turbomachinery noise (fan and turbine stages mainly) is expected to increase significantly. A review of analytical models and numerical methods to yield both tonal and broadband contributions of such noise sources is presented. The former rely on hybrid methods coupling gust response over very thin flat plates of finite chord length, either isolated or in cascade, and acoustic analogies in free-field and in a duct. The latter yields tonal noise with unsteady Reynolds-Averaged Navier–Stokes (u-RANS) simulations, and broadband noise with Large Eddy Simulations (LES). The analytical models are shown to provide good and fast first sound estimates at pre-design stages, and to easily separate the different noise sources. The u-RANS simulations are now able to give accurate estimates of tonal noise of the most complex asymmetric, heterogeneous fan-Outlet Guiding Vane (OGV) configurations. Wall-modeled LES on rescaled stage configurations have now been achieved on all components: a low-pressure compressor stage, a transonic high-pressure turbine stage and a fan-OGV configuration with good overall sound power level predictions for the latter. In this case, hybrid Lattice–Boltzmann/very large-eddy simulations also appear to be an excellent alternative to yield both contributions accurately at once.

Suppression of tonal noise in a centrifugal fan using guide vanes

2015 ◽  
Vol 357 ◽  
pp. 95-106 ◽  
Author(s):  
Kishokanna Paramasivam ◽  
Srithar Rajoo ◽  
Alessandro Romagnoli
Keyword(s):  
Centrifugal Fan ◽  
Tonal Noise ◽  
Guide Vanes
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