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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。
In this paper, a new type of loop-driven refrigeration system is proposed. It consists of a series loop of multiple thermoacoustic engines and a pulse tube refrigerator connected in parallel with the engine unit. The system in the engine and refrigerator circuit can achieve traveling wave conversion and acoustic recovery, the potential high efficiency of the machine. Mainly for the three-unit loop system theoretical research. Firstly, the influence of the three key sound ducts on the system performance is investigated by using the two-parameter method, and the optimal design is carried out. Then, the contrast of the system phase difference and the acoustic power along the length of the phase-change tube of different refrigerators is further contrasted and investigated. Finally, the performance comparison with the bypass structure. It can be concluded that the parallel system is significantly improved both in terms of cooling capacity and relative Carnot efficiency.