新型环路热驱动声功回收型制冷机研究

A Novel Thermoacoustically-Driven Pulse Tube Cooler Capable of Energy Recovery

本文提出一种新型环路热驱动制冷系统,由多个热声发动机串联组成的环路以及并联于发动机单元的脉管制冷机组成。该系统在发动机和制冷机回路均能实现行波转换及声功回收,整机潜在效率高。主要针对三单元环路系统展开理论研究。首先,利用双参数法考察了三个关键声导管对系统性能的影响,并进行了优化设计。接着,进一步对比考察了不同制冷机调相管长度下,系统相位差和声功的沿程分布。最后,与旁路结构进行了性能对比。可以得出,该并联型系统无论在制冷量还是相对卡诺效率方面均有明显提高。

A novel thermoacoustically-driven pulse tube cryocooler system has been proposed and investigated in this paper.In this configuration,heat engines are incorporated in a loop,and pulse tube coolers are paralleled to the heat engine.It not only realizes the traveling-wave acoustic field but also power recovery for both heat engines and cryocoolers,leading to the potential of high overall efficiency.Numerical investigations have been conducted on a typical three-stage system based on the thermoacoustic theory.Firstly,emphasis has been put on the influence of the acoustic tube dimensions,and the optimized dimensions are obtained.The distributions of the phase difference and acoustic power,under two different length combination of acoustic tubes,are then presented.Finally,a comparison has been made between this novel configuration and the previous branch configuration.According to the calculated results,this novel configuration significantly achieves superior performance in both cooling power and total exergy efficiency.