scholarly journals Frequency-Domain Linearized Euler Model for Turbomachinery Noise Radiation Through Engine Exhaust

AIAA Journal ◽  
2010 ◽  
Vol 48 (4) ◽  
pp. 848-858 ◽  
Author(s):  
Andrea Iob ◽  
Renzo Arina ◽  
Claudia Schipani
Keyword(s):  
Frequency Domain ◽  
Engine Exhaust ◽  
Noise Radiation ◽  
Euler Model

scholarly journals A Frequency-Domain Linearized Euler Model for Noise Radiation

10.5772/19145 ◽  
2011 ◽  
Author(s):  
Andrea Iob ◽  
Roberto Della Ratta Rinaldi ◽  
Renzo Ari
Keyword(s):  
Frequency Domain ◽  
Noise Radiation ◽  
Euler Model

Computation of Fan Noise Radiation through an Engine Exhaust Geometry with Flow

2007 ◽  
Vol 6 (3) ◽  
pp. 223-241 ◽  
Author(s):  
S.K. Richards ◽  
X.X. Chen ◽  
X. Huang ◽  
X. Zhang
Keyword(s):  
Acoustic Wave ◽  
Computational Model ◽  
Acoustic Waves ◽  
Near Field ◽  
Aircraft Engine ◽  
Computational Domain ◽  
Mean Flow ◽  
Engine Exhaust ◽  
Noise Radiation ◽  
Acoustic Treatment

This paper outlines a computational model of noise radiation from a realistic engine exhaust geometry with flow. The computational model described allows acoustic waves, propagating inside the bypass duct of a generic aircraft engine, to be admitted into a computational domain that includes the aft duct section, the exit plane of the duct, and the jet flow immediately downstream. The method has three parts: a matching process to admit acoustic waves into the induct propagation region; near field propagation inside the duct and diffraction at the lip of the exhaust duct; and an integral surface for far field directivity. In this model the near field propagation is determined by a numerical solution of a 2.5D form of the linearised Euler equations. The mean flow about which the equations are linearised is assumed to be axisymmetric. The proposed method is illustrated through a case study on the radiation of a typical fan assembly generated acoustic wave from a generic engine bypass duct. Inside the duct, an acoustic wave of circumferential order m = −13 and comprising five radial modes ( n = 1 – 5) is admitted into the model as inputs on the boundary of the computation domain. The radiation of the acoustic wave through the exhaust geometry and mean flow is determined, with the effect of acoustic treatment through the inclusion of lined duct sections also examined.

Frequency-domain prediction of turbofan noise radiation

2004 ◽  
Vol 270 (4-5) ◽  
pp. 933-950 ◽  
Author(s):  
Y. Özyörük ◽  
E. Alpman ◽  
V. Ahuja ◽  
L.N. Long
Keyword(s):  
Frequency Domain ◽  
Noise Radiation ◽  
Domain Prediction

Correction to "The analysis of slug tests in the frequency domain" (WRR 25(11), pp. 2388-2396

1990 ◽  
Vol 26 (8) ◽  
pp. 1863-1863
Author(s):  
Paul Marschall ◽  
Baldur Barczewski
Keyword(s):  
Frequency Domain ◽  
Slug Tests
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