微型热声制冷机的试验研究

Investigation on a miniature thermoacoustic refrigerator

研制了一种复合结构的PZT声驱动器,谐振管结构中加入了渐缩锥管后空管谐振试验的结果表明该驱动器所能产生的声压超过了目前已经报道的同频率范围的热声制冷机。在此基础上研制的微型热声制冷机在运行频率2.2 KHz时,平均压力从0.5 MPa到2.1 MPa之间进行了一系列的工况试验,得到了最大温降12.3℃,最大温差31℃,均达到同类机型目前报道的最佳性能。在此基础上提出了工程化应用的进一步改进方向。

The performance of a Miniature Thermoacoustic Refrigerator （miniTAR） is influenced mainly by geometry of the whole system and design of acoustic driver. A improved composite structure PZT-driver was made to generate higher dynamic pressure in pressured resonator with cone section. With the application of this acoustic driver a miniature theromoacoustic refrigerator was developed. It was operated around 2.2 kHz in the mean pressure range from 0.5 MPa to 2 MPa, which could reach a temperature difference around 31 ℃ and maximal 12.3 K cold down. Both are the best result compare with reported similar prototypes. On the base of initial cooling tests improvements on engineering application are discussed.