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基于流体网络理论,研究了通过改变回热器流阻对由双向进气阀诱发的直流流动进行抑制的可行性,计算结果表明,增加回热器流阻可以有效地抑制直流,进而有望提高脉管制冷机在高温区的稳定性能.在此基础上,采用不同的回热器填料布置方式,对脉管制冷机的稳定特性开展实验研究,通过采用直径0·25mm的铅丸代替回热器冷端(0·3回热器长度)247目不锈钢丝网的方法,实现了制冷机在80K温区长时间稳定工作.该研究为解决脉管制冷机存在的高温区性能不稳定提供了新的途径.
Based on the fluid network theory, the feasibility of suppressing the DC flow induced by the two-way intake valve by changing the flow resistance of the regenerator is studied. The calculation results show that increasing the flow resistance of the regenerator can effectively suppress the DC flow, In order to control the stable performance of the refrigerator in the high temperature zone, the different characteristics of the regenerator packing were used to study the stability of the pulse tube refrigerator. By using the lead pellets with a diameter of 0.25mm instead of the regenerator Cold end (length of 0.3 regenerator) 247 mesh stainless steel wire mesh method to achieve a long time stable operation of the refrigerator at 80K temperature.This study provides a new solution to the instability of the performance of the high-temperature region of the pulse tube refrigerator Way.