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提出了一种“二介质耦合声学放大器”作为热声发动机与低温脉冲管制冷机的新型耦合机构,使其继续保持压力幅值放大的功能,且能够在热声发动机和脉冲管制冷机之间安装弹性膜.利用此新型耦合机构,可以使热声发动机以氮气为工作介质获得较低的工作频率,而脉冲管制冷机则可采用氦气为工作介质使其优良的低温制冷性能得到保证.采用聚能型行波热声发动机驱动,最终使一台两级脉冲管制冷机获得了18.7K的无负荷温度,使热驱动的热声制冷机突破了液氢温度.
A “two-medium coupled acoustic amplifier” is proposed as a new type of coupling mechanism between a thermoacoustic engine and a low-temperature pulse tube refrigerator so that it continues to maintain the function of amplifying the pressure amplitude and can be used between the thermoacoustic engine and the pulse tube refrigerator Install the elastic membrane.With this new coupling mechanism, you can make the thermoacoustic engine to nitrogen as the working medium to obtain a lower operating frequency, and the pulse tube refrigerator can use helium as the working medium to make its excellent low temperature refrigeration performance is guaranteed. Driven by a converging traveling-wave thermoacoustic engine, finally attaining a no-load temperature of 18.7K for a two-stage pulse tube refrigerator, which makes the heat-driven thermoacoustic refrigerator break through the liquid hydrogen temperature.