带预冷的4K斯特林型脉管制冷机设计

DESIGN OF 4 K STIRLING TYPE PULSE TUBE CRYOCOOLER WITH PRECOOLING

本文提出了采用两级G-M型脉管制冷机预冷一台单级斯特林型脉管制冷机来研究液氦温区斯特林型脉管制冷机性能的实验方案.基于回热器数值模拟软件REGEN3.3,重点研究了液氮温区回热器长度、回热器填料、气体工质对回热器效率的影响.采用低温惯性管作为斯特林型脉管制冷机调相装置,在小声功系统中实现了理想相位关系的调节,有效提高小型斯特林型脉管制冷机的效率.

A single-stage Stirling type pulse tube cryocooler（PTC） precooled by a two-stage G- M type PTC was proposed to investigate the cooling performance of Stirling type PTC working at liquid helium temperature. Effect of regenerator length, regenerator matrix and working fluid on regenerator efficiency was investigated based on a regenerator simulation model known as REGEN 3.3. Cold inertance tube was used as the phase shifter in the Stifling type PTC to achieve better phase relationship between the mass flow and the pressure which greatly increases the efficiency of Stifling type PTC with small acoustic power input according to the calculation results.