On sound transmission loss across a Helmholtz resonator in a low Mach number flow duct

2010 ◽  
Vol 127 (6) ◽  
pp. 3519-3525 ◽  
Author(s):  
S. K. Tang
Keyword(s):  
Mach Number ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Helmholtz Resonator ◽  
Sound Transmission Loss ◽  
Low Mach Number ◽  
Number Flow ◽  
Low Mach Number Flow ◽  
Flow Duct

Acoustic Behavior Prediction and Analysis of Resonators in the Presence of Low Mach Number Flow

2020 ◽  
Vol 28 (03) ◽  
pp. 1950015
Author(s):  
Hongpu Huang ◽  
Zhenlin Ji ◽  
Kangjian Han
Keyword(s):  
Mach Number ◽  
Resonance Frequency ◽  
Flow Velocity ◽  
Stokes Equations ◽  
Transmission Loss ◽  
Numerical Procedure ◽  
Low Mach Number ◽  
Resonance Frequencies ◽  
Number Flow ◽  
Low Mach Number Flow

The frequency-domain linearized Navier–Stokes equations (LNSEs) are used to describe the sound field of Helmholtz resonators and concentric perforated tube resonators in the presence of low Mach number flow. The numerical procedure of LNSEs method is performed in three steps, computational fluid dynamics (CFD) calculation, data transfer and acoustics calculation. The transmission loss predictions of the resonators exhibit good agreement with measurements published in the literature. The results show that the low Mach number flow shifts the resonance frequencies of resonators and changes the acoustic attenuation behavior, which may be attributed to the change of acoustic impedance of the opening and orifices. In order to weaken the effect of flow on the resonance frequency, the modified configurations of resonators are proposed by using the conical tubes to reduce the flow velocity passing the opening and orifices. Numerical results demonstrated that the influence of flow velocity on the resonance frequency of the modified resonators is less sensitive than the original configurations.

Flux-vector splitting for compressible low mach number flow

1993 ◽  
Vol 22 (4-5) ◽  
pp. 441-451 ◽  
Author(s):  
Jörn Sesterhenn ◽  
Bernhard Müller ◽  
Hans Thomann
Keyword(s):  
Mach Number ◽  
Flux Vector ◽  
Low Mach Number ◽  
Flux Vector Splitting ◽  
Number Flow ◽  
Low Mach Number Flow

scholarly journals Active acoustic cloaking of cylindrical shells in low Mach number flow

2020 ◽  
Vol 479 ◽  
pp. 115400
Author(s):  
Briscoe Kerferd ◽  
Daniel Eggler ◽  
Mahmoud Karimi ◽  
Nicole Kessissoglou
Keyword(s):  
Mach Number ◽  
Cylindrical Shells ◽  
Low Mach Number ◽  
Number Flow ◽  
Low Mach Number Flow
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