脉管制冷机双段惯性管调相性能研究

Research on phase modulation performance of dual-diameter inertance tube in pulse tube cryocooler

通过建立一维模型,结合响应面优化法,对结构参数如何影响双段惯性管调相性能、惯性管入口处声阻抗与冷头COP的关系进行了仿真研究。在此基础上,确定了最优双段惯性管尺寸,并对双段惯性管在不同运行参数下的调相性能,以及脉管制冷机整机性能进行了实验研究。结果表明,第二段惯性管直径对惯性管入口阻抗幅值和声功的影响较小,双段惯性管调相角度在运行频率60 Hz时达到最大值,惯性管入口阻抗最优点在阻抗相位60°、阻抗幅值9.5×10^(8)Pa·s/m^(3)附近。最优双段惯性管尺寸下,脉管制冷机能够在80 K制冷温度和150 W输入电功下,达到6.5 W的制冷量。

A one-dimensional model and response surface optimization method are used to conduct simulation research on how the structure parameters affect the phase modulation performance,as well as the relationship between the acoustic impedance and cold-finger’s COP.On this basis,the optimal size of the dual-diameter inertance tube was determined,and experimental research was conducted on the phase modulation performance of the dual-diameter inertance tube under different operating parameters,as well as the wholemachine performance of the pulse tube refrigerator.The results show that the diameter of the second section of the inertance tube has a small impact on the impedance amplitude and acoustic power at the entrance of the inertance tube,the phase modulation angle of the dual-diameter inertance tube reaches its maximum value at the operating frequency of 60 Hz,and the optimal impedance at the entrance of the inertance tube is around the phase of 60°and the amplitude of 9.5×10^(8) Pa s/m^(3).Under the optimal dualdiameter inertance tube size,the pulse tube refrigerator can achieve a cooling capacity of 6.5 W at a cooling temperature of 80 K and an input power of 150 W.