直连型热驱动热声制冷系统中热缓冲管结构对系统性能影响  

Influence of thermal buffer tube structure on system performance in direct-coupling thermoacoustic refrigeration system

作　　者：姜一帆 康慧芳[1] 沈俊[2] 陈卓 张凌霄 丁夏琛 李振兴[2] 刘俊 Jiang Yifan;Kang Huifang;Shen Jun;Chen Zhuo;Zhang Lingxiao;Ding Xiachen;Li Zhenxing;Liu Jun(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Technical Institute of Physics and Chemistry,Chinese Academy of Science,Beijing 100190,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]中国科学院理化技术研究所,北京100190

出　　处：《低温工程》2021年第6期29-36,共8页Cryogenics

基　　金：国家杰出青年科学基金(51925605)。

摘　　要：为提高热驱动制冷系统性能,使用DeltaEC软件构建了四级直连型环路热驱动制冷系统,分析了热缓冲管内径和长度对系统热效率、制冷量等因素的影响,对比分析了结构改进前后声场和声功流沿程分布。结果表明:热缓冲管内径和长度影响声场的相位和阻抗分布,不同内径下长度对系统性能的影响不同,减小内径可以显著提升系统总热效率、制冷量、热声转换效率以及发动机产生的声功,发动机和制冷机回热器处于较好的行波相位和较高的声学阻抗,同时可以有效减少沿缓冲管的轴向导热漏热和辐射漏热。To improve the performance of thermal drive refrigeration system,a four-stage direct-coupling looped heat-driven thermoacoustic refrigeration system was constructed by using DeltaEC software.The influence of the inner diameter and length of the thermal buffer tube on the thermal efficiency and cooling capacity of the system was analyzed,and the distribution of sound field and power flow was compared before and after the structural improvement.The results show that:The inner diameter and length of the thermal buffer affect the phase and impedance distribution of the sound field.The length has different influence on system performance under different inner diameter.The reduction of the inner diameter can significantly improve the total thermal efficiency,refrigerating capacity,thermoacoustic conversion efficiency and the acoustic work generated by the engine.The regenerator of the engine and refrigerator has a good traveling wave phase and a high acoustic impedance,which can effectively reduce the axial thermal and radiative heat leakage along the buffer tube.

关 键 词：热缓冲管 热声制冷 锥形管 

分 类 号：TB651[一般工业技术—制冷工程]