In this article, a new kind of pulse tube refrigerator with low temperature switch valve and liquid nitrogen precooler is introduced.
对新型的带有液氮预冷的低温旋转阀式脉冲管制冷机进行了实验研究，得到了一些有意义的结果。
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To fully utilize the low temperature exergy of liquid hydrogen, installed additionally in a hydrogen energy based gas turbine cycle is an air precooler and hydrogen turbine.