Visualization of acoustic resonance phenomena using Kundt’s dust figure method

2006 ◽  
Vol 120 (5) ◽  
pp. 3070-3070 ◽  
Author(s):  
Shinichi Sakamoto ◽  
Takumi Asakura ◽  
Kanako Ueno ◽  
Yu Sakimoto ◽  
Fumiaki Satoh ◽  
...  
Keyword(s):  
Acoustic Resonance ◽  
Resonance Phenomena

1101 Study of Acoustic Resonance Phenomena Including Sound Source Position

2013 ◽  
Vol 2013 (0) ◽  
pp. _1101-01_-_1101-04_
Author(s):  
Fumio SHIMIZU ◽  
Junichiro TAMAO ◽  
Kazuhiro TANAKA
Keyword(s):  
Sound Source ◽  
Acoustic Resonance ◽  
Source Position ◽  
Resonance Phenomena

Acoustic Resonance in Aeroengine Intake Ducts

2004 ◽  
Vol 126 (3) ◽  
pp. 432-441 ◽  
Author(s):  
A. J. Cooper ◽  
A. B. Parry ◽  
N. Peake
Keyword(s):  
Theoretical Model ◽  
Analytical Methods ◽  
Swirling Flow ◽  
Acoustic Resonance ◽  
Rotating Stall ◽  
Flow Conditions ◽  
Resonance Phenomena ◽  
Axial Variation ◽  
Acoustic Lining

A theoretical model is used to investigate the effect of geometry, flow conditions and acoustic lining on the occurrence of acoustic resonance within aeroengine ducts. Semi-analytical methods are used to demonstrate that two types of acoustic resonance can be excited. The first is an intake resonance arising due to axial variation of the intake shape and the presence of swirling flow downstream of the rotor. The second occurs as a result of mode trapping between the rotor and stator. Such resonance phenomena may be relevant to the destabilization of the fan and the onset of flutter and rotating stall.

Prediction of acoustic resonance phenomena for weapon bays using detached eddy simulation

2005 ◽  
Vol 109 (1102) ◽  
pp. 631-638 ◽  
Author(s):  
R. M. Ashworth
Keyword(s):  
Shear Layer ◽  
Hybrid Method ◽  
Acoustic Resonance ◽  
Navier Stokes ◽  
Detached Eddy Simulation ◽  
Vortical Structures ◽  
Eddy Simulation ◽  
Resonance Phenomena ◽  
Cavity Configuration ◽  
Unsteady Rans

AbstractIt is argued that acoustic resonance phenomena in open cavities such as weapons bays cannot be adequately predicted through numerical solution of Reynolds averaged Navier-Stokes (RANS) equations. The requirement to resolve the growth of the shear layer instability from the lip of the cavity inevitably implies that turbulence further downstream is resolved while also being modelled thus making RANS over dissipative. Large eddy simulation (LES) models only unresolved scales and a hybrid method combining RANS near walls with LES in the cavity appears a practical alternative to pure RANS. This paper compares computations of the M219 cavity configuration made with unsteady RANS and with the hybrid method known as detached eddy simulation (DES). It is shown that whilst unsteady RANS and DES give very similar predictions for the 1stand 3rdmodes of the acoustic resonance the 2ndmode (which is dominant near the centre of the cavity) is absent in the RANS results but well predicted by DES. The 2ndmode is thought to arise from an interaction with vortical structures in the shear layer which are suppressed in the highly dissipative RANS method. The 4thmode, which is much weaker than the other three modes, is over-predicted by DES and under-predicted by a smaller amount in RANS.

Acoustic resonance phenomena in air bleed channels in aviation engines

2016 ◽  
Vol 57 (6) ◽  
pp. 971-978
Author(s):  
A. A. Aleksentsev ◽  
A. N. Sazhenkov ◽  
S. V. Sukhinin
Keyword(s):  
Acoustic Resonance ◽  
Resonance Phenomena ◽  
Aviation Engines
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