两级GM制冷机数值模拟与分析  

Numerical simulation and exergy analysis of a two-stage GM cryocooler

作　　者：陈鑫 植晓琴[1] 韦涛 高天 邱利民[1] Chen Xin;Zhi Xiaoqin;Wei Tao;Gao Tian;Qiu Limin(Institute of Refrigeration and Cryogenics,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学制冷与低温研究所,杭州310027

出　　处：《低温工程》2024年第3期20-27,共8页Cryogenics

基　　金：国家自然科学基金资助项目(No.52322601);浙江省自然科学基金资助项目(No.LR23E060002)。

摘　　要：采用Sage软件建立了两级GM制冷机整机数值模型,并通过实验结果进行了验证。基于数值模型和?分析方法,分析了不同制冷温度下压缩机、旋转阀与冷头的损失分布。结果表明,损失主要发生在压缩机和旋转阀上。冷头的损失随着制冷温度的降低而增加,在4.2 K时36%的损失发生在冷头上,其中61%的冷头损失是由于实际气体效应引起。压缩机、旋转阀和回热器的低效性以及实际气体效应主导了制冷机的损失,导致制冷机效率低下。A comprehensive numerical model of a two-stage GM cryocooler was developed u-sing Sage software and validated against experimental results.Based on this numerical model and exergy analysis methods,the distribution of losses in the compressor,rotary valve,and cold head at various refrigeration temperatures was analyzed.The results indicate that the majority of the los-ses occur in the compressor and rotary valve.The losses in the cold head increase as the refrigera-tion temperature decreases,with 36% of the losses occurring in the cold head at 4.2 K,of which 61%are due to the effects of real gas.The inefficiency of the compressor,rotary valve,and re-generator,along with the real gas effects,predominantly contribute to the losses in the cryocooler,leading to its low efficiency.

关 键 词：GM制冷机 数值模拟 ?分析 液氦温区 

分 类 号：TB651[一般工业技术—制冷工程]