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热声制冷机板叠的非线性阻抗研究

发表时间:2013-02-15  浏览量:1183  下载量:519
全部作者: 葛欢,范理,张淑仪,肖疏雨,陶莎,邱美晨,张辉
作者单位: 南京大学声学研究所,近代声学教育部重点实验室
摘 要: 为提高实用化热声制冷机各部件之间的声耦合,进而提高热声制冷机的工作效率,结合多孔材料的相关流阻理论,设计实验研究了热声制冷机的重要部件之一即热声板叠在非线性条件下的声阻抗特性。提出线性流阻、非线性系数以及等效声质量3个参量描述板叠的非线性阻抗。研究发现,板叠的声流阻随声压增加产生明显的非线性增长,而其等效声质量基本不随声压级变化。此外,3个参量均随孔隙率的增大而减小,且对频率变化不敏感,同时铜网板叠厚度的增加会增大单位长度的声流阻。
关 键 词: 声学;非线性;阻抗测量;热声板叠
Title: Study on nonlinear impedance of stack in thermoacoustic refrigerator
Author: GE Huan, FAN Li, ZHANG Shuyi, XIAO Shuyu, TAO Sha, QIU Meichen, ZHANG Hui
Organization: Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University
Abstract: In order to improve the acoustic coupling between each part of the thermoacoustic refrigerator system, and further improve the efficiency of the thermoacoustic refrigerator, this study designed an important part of thermoacoustic refrigerator, that is the nonlinear acoustic impedance of the stack. In this paper, three parameters such as the linear resisitance, nonlinear coefficient and effective mass of the stack are presented to describe the nonlinear impedance of the stack. It was found that the resistance of the stack exhibited obvious nonlinear effect with the increasing of the sound pressure, while the effective mass keeped constant. In addition, the three parameters decreased with the increasing of volume porosity of the stack, while the operating frequency hardly influenced them. Furthermore, the resistance of the stack also increased with the increasing of the stack length.
Key words: acoustics; nonlinear; impedance measurement; thermoacoustic stack
发表期数: 2013年2月第3期
引用格式: 葛欢,范理,张淑仪,等. 热声制冷机板叠的非线性阻抗研究[J]. 中国科技论文在线精品论文,2013,6(3):221-227.
 
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