Nonlinear acoustic impedance of thermoacoustic stack

In order to optimize the performances of the thermoacoustic refrigerator working with the high sound pressure level, the nonlinear acoustic characteristics of the thermoacoustic stack in the resonant pipe are studied. The acoustic fluid impedance of the stack made of copper mesh and set up in a reso...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied physics 2012-09, Vol.112 (6)
Main Authors: Ge, Huan, Fan, Li, Xiao, Shu-yu, Tao, Sha, Qiu, Mei-chen, Zhang, Shu-yi, Zhang, Hui
Format: Article
Language:English
Subjects:
Acoustic impedance
Acoustics
Mathematical models
Nonlinearity
Pipe
Sound pressure
Stacks
Thermoacoustics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In order to optimize the performances of the thermoacoustic refrigerator working with the high sound pressure level, the nonlinear acoustic characteristics of the thermoacoustic stack in the resonant pipe are studied. The acoustic fluid impedance of the stack made of copper mesh and set up in a resonant pipe is measured in the acoustic fields with different intensities. It is found that when the sound pressure level in the pipe increases to a critical value, the resistance of the stack increases nonlinearly with the sound pressure, while the reactance of the stack keeps constant. Based on the experimental results, a theory model is set up to describe the acoustic characteristics of the stack, according to the rigid frame theory and Forchheimmer equation. Furthermore, the influences of the sound pressure level, operating frequency, volume porosity, and length of the stack on the nonlinear impedance of the stack are evaluated.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4752761