有限填料热容下脉管制冷机内的热输运效应  

Heat transport effect in pulse tube refrigerator with finite filler heat capacity

作　　者：王泽昆 蒋明玥 刘辉明[1] 师莉 李来风[1,2] 周远 Wang Zekun;Jiang Mingyue;Liu Huiming;Shi Li;Li Laifeng;Zhou Yuan(Key Laboratory of Cryogenic Engineering,Technical Institute of Physical and Chemical,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院理化技术研究所低温工程学重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《低温工程》2024年第4期21-24,46,共5页Cryogenics

基　　金：国家重点研发计划(2023YFF0721302)。

摘　　要：为了优化脉管制冷机的泵热特性,探讨有限填料热容对回热器内部热输运过程的影响。基于回热器的2维模型,获得了有限填料体积热容下的热声输运过程的解析解。结果表明脉管制冷机内的热输运过程包括3个部分:声压热输运、壁温热输运、速度热输运。壁温热输运效应产生于壁面温度周期变化,它不同于基于壁面轴向温度梯度的导热过程,也区别于速度热输运过程。当温度从300 K降低到40 K时,壁温热能通量不断减小,不过壁温热能通量相对于截面热能通量的大小从5%增加到12%。In order to improve the cooling performance in pulse tube refrigerator,the influence of the finite volume heat capacity on the regenerator was investigated.Based on the two-dimensional model of the regenerator,the thermoacoustic process was sloved with finite volume heat capacity.It was found that the thermoacoustic process included acoustic pressure thermal transport,wall temperature thermal transport and velocity thermal transport.The wall temperature thermal transport effect aroused from the periodic variation of wall temperature,which was different from the thermal conductivity based on the axial temperature gradient of the wall and also different from the velocity thermal transport.When the temperature decreased from 300K to 40K,the wall temperature heat flux continuously decreased,and the wall temperature heat flux relative to the crosssectional thermal heat flux increased from 5% to 12%.

关 键 词：有限热容 脉管制冷机 壁温热输运 

分 类 号：TB651[一般工业技术—制冷工程]