中文摘要：

结合经典双效斯特林制冷机结构与热声理论，提出一种谐振管耦合型双效斯特林制冷机，采用声学谐振管耦合斯特林发动机与斯特林制冷机，从而实现热驱动制冷，具有结构简单、潜在效率高、可靠性高、绿色环保的优点，在小型天然气液化、冷电联供以及空间探测领域有较大的应用潜力。针对实验室现有发动机和制冷机的参数，采用模拟软件Sage搭建了计算模型，计算验证了该结构的可行性。计算结果表明，在充气压力为3MPa，工作频率为50Hz，发动机压比为1．3条件下，该系统在80K的制冷温度可获得210W制冷量，整机炯效率为11．3％。同时进一步探究了系统内声场分布和主要部件炯损失，研究表明回热器内部声场偏离行波声场，谐振管中粘性损失较大和制冷机输入声功偏小是当前整机效率较低的主要原因。如果进行合理的优化设计，此类系统可以实现25％以上的整机炯效率。

英文摘要：

Combining the structure of the classical duplex Stirling cooler with thermoacoustics, this article puts forward a new type resonance tube coupled duplex free-piston Stirling cooler, in which a free-piston Stirling engine drives a free piston Stirling cooler. It has the advantages of potentially high efficiency, simple structure and high reliability. Using the parameters of a free piston Stirling engine and a free piston Stirling cooler existing in our laboratory, we built a calculation model based on Sage, to verify the feasibility of the novel system. The calculation shows that the system can provide 210 W cooling power, with a general exergy efficiency of 11.3% at 80 K in the condition that average pressure is 3 MPa, pressure ratio is 1.3 at the engine compression space and frequency is 50 Hz. Low exergy efficiency is simply due to the fact that both the engine and the cooler are originally designed for other purposes and some sacrifices on the performance are made to couple both together through the resonance tube. Exergy efficiency of similar systems could be improved to over 25% if the whole system could be re-designed.