中文摘要：

优化设计并研制了一小冷量液氮温区高频热驱动脉冲管制冷机,系统轴向长度仅为1.2 m。针对之前系统热效率较低问题,在数值计算的指导下,对高频驻波热声发动机的板叠流道尺寸和热腔进行了优化,并对声压放大器进行了调整。采用4.0 MPa氦气为工质,在发动机端加入750 W加热量获得了68.3 K的最低制冷温度,这是目前国际上报道的高频热驱动脉冲管制冷机的最低制冷温度。加入500 W加热量时,制冷机获得了76.9 K的无负荷最低制冷温度,在80 K时有0.2 W的制冷量。

英文摘要：

A high frequency thermoacoustically driven pulse tube cryocooler system whose axial length is merely 1.2 m has been optimized to provide hundreds of Watt cooling power in the liquid nitrogen temperature range. Targeting on improving the thermal efficiency of the former experimental system, the dimensions of the stack and hot buffer of the high frequency standing-wave thermoacoustic heat engine as well as the acoustic amplifier tube have been optimized with the guidance of numerical calculations. With 4.0 MPa helium as working gas and 750 W heating power, a no load temperature of 68.3 K has been obtained, which is the lowest temperature that has been reported on the high frequency thermoacoustically driven pulse tube cryocooler. And with 500 W heating power, a no load temperature of 76.9 K and 0.2 W cooling power at 80 K have been achieved.