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自由活塞斯特林制冷机具有高可靠性、高效率、结构紧凑等优点,在高温强电超导和气体液化等领域有较广阔的应用前景。本文针对一台液氮温区大冷量自由活塞斯特林制冷机展开了实验和计算研究.实验中,输入声功2.35 kW时,制冷机在80 K获得了215 W制冷量,相对卡诺效率为24.9%。数值计算表明室温端换热器的性能不足对制冷机性能影响较大,此外,结构缺陷导致的回热器轴向孔隙率不均匀可能是制约制冷机性能的主要因素。针对上述问题优化系统有望显著提升制冷机性能。
Free piston Stirling refrigerator with high reliability, high efficiency, compact structure, etc., in the high temperature superconductor and gas liquefaction and other fields have a broader application prospects. In this paper, an experimental and computational study is carried out on a large free-piston Stirling freezer with liquid nitrogen temperature region. In the experiment, when the input sound power is 2.35 kW, the refrigerator obtains 215 W cooling capacity at 80 K, Efficiency is 24.9%. The numerical calculation shows that the performance of the heat exchanger at the room temperature has a great influence on the performance of the refrigerator. In addition, the uneven axial porosity of the regenerator caused by structural defects may be the main factor that restricts the performance of the refrigerator. Optimizing the system for the above problems is expected to significantly improve the performance of the refrigerator.