双声源驱动热声系统的理论声场重构与实验验证  

Theoretical reconstruction and experimental verification of acoustic field in thermoacoustic system by double acoustic drivers

作　　者：周立华[1,2] 谢秀娟[1] 李雷[1,2] 李青[1] 

机构地区：[1]中国科学院理化技术研究所低温工程学重点实验室,北京100190 [2]中国科学院研究生院,北京100039

出　　处：《低温工程》2010年第2期14-19,共6页Cryogenics

基　　金：中国科学院重大科研装备研制项目(YZ200738);中国科学院知识创新工程青年人才领域前沿项目(TYF0807)资助

摘　　要：搭建了一套双声源驱动热声热机实验系统,该系统包括双扬声器、谐振管、置于谐振管内的回热器和换热器等元件。利用双声源法,可实现对谐振管及回热器边界声场的任意调制,包括调节幅值(调幅)、调节相位(调相)和调节频率(调频)。在给定双声源条件下,采用双传感器法对该系统谐振管中的声场参数(包括声压、质点速度、当地声阻抗等)分布进行理论声场重构,并通过实验分析,证实了该方法在等径谐振管内非声压腹点和节点处的适用性和准确性,而在声压腹点和节点处(附近)的误差最大达到12.4%。同时,对谐振管内的声场进行了行波驻波分解,得到了谐振管中行驻波成分比例。A thermoacoustic system with double acoustic drivers was constructed, which was composed of double speakers, a resonator, regenerator distributed in resonator and heat exchanger. By double acoustic drivers, the acoustic field in resonator could be modulated, including amplitude modulation（AM） , phase modulation （PM） and frequency modulation （FM）. Under the given condition of acoustic driver, the acoustic field including oscillating pressure, volume flow rate and acoustic impedance in resonator was theoretically reconstructed by using the two-microphone method. The experiment results validate that this method is ap- plicable and accurate for the positions with non pressure antinode and node in resonator. The maximum errors near antinode and node area are up to 12.4%. The proportions of traveling wave component（TWC） and standing wave component（SWC） were obtained.

关 键 词：双声源驱动 回热器 声场重构 行驻波 

分 类 号：TB611[一般工业技术—制冷工程]