A novel Stirling type pulse tube cryocooler suppressing the third type of dc gas flow

Abstract

This paper analyzes the zero and first order pressure drop along the pulse tube system and presents a simple but elegant way of eliminating the third type of DC gas flow which increases the efficiency of a Stirling type PTC. Since the optimization of a PTC depends sensitively on the adjustment of the phase angle between the pressure and mass flow because of its influence on the suppression of the third type of DC gas flow, we have done a series of experiments on a Stirling type multi-bypass PTC in order to attain the lowest refrigeration temperature. After the multi-bypass PTC reaches its lowest temperature, we open the metering valve to the best degree which connects the back pressure chamber of the linear compressor to the reservoir. For this novel type of PTC, the lowest refrigeration temperature drops from 38.8 K to 25.9 K after opening the metering valve. This approach offers a promising way for a compact single stage Stirling type PTC to reach liquid hydrogen temperatures.

脉冲管制冷机多种直流效应研究进展

“…顾超在此研究基础之上借鉴 Cha 等人 [44] 在实验方面, Gu 等人 [16] 提出了一种创新的方法, 即把压缩机背压腔与气库用调节阀相连, 在一些情 况下能够大大降低制冷温度. 多路旁通的方法也被 实验证实为一种有效的抑制第三种直流的手段 [45] . 但相比 Gedeon 流和 Rayleigh 流, 目前对第三种直流 缺乏深入的机理性实验研究和抑制方法的探索, 未 来有广阔的研究空间.…”