环路热声制冷机的多层丝网回热器数值模拟研究  

Numerical Study on a Looped Thermoacoustic Refrigerator with Multi-layered Mesh Screen Regenerators

作　　者：文靖 康慧芳[1] 张凌霄 WEN Jing;KANG Huifang;ZHANG Lingxiao(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《真空与低温》2024年第5期556-565,共10页Vacuum and Cryogenics

基　　金：国家重点研发计划(2022YFB3505103)。

摘　　要：热声制冷技术具备高度可靠性的同时具有显著的环境友好性,回热器作为核心部件直接影响热声制冷机的性能。为了使热声制冷机回热器在不同温度下均高效地泵热,设计了一种使用多层丝网回热器的四级环路热声制冷机并进行了数值模拟研究。计算结果表明,多层回热器的设计有利于保证回热器换热效果的同时减少黏性耗散,从而提升制冷机制冷量和效率。研究表明,三层丝网回热器的系统性能最优,在6 MPa高压氦气、高温端923 K、室温端303 K的条件下,在77 K制冷温度时获得制冷量109 W,高于单层、二层和四层回热器。Thermoacoustic refrigeration technology,known for its high reliability and significant environmental friendli-ness,relies heavily on the performance of the regenerator.To efficiently pump heat at different temperatures in the regenera-tor,a four-stage looped thermoacoustic refrigerator utilizing a multi-layered mesh regenerator is proposed and numerically simulated.The computational results indicate that the design of a multi-layered regenerator is conducive to ensuring efficient heat exchange while reducing viscous dissipation,thereby enhancing refrigeration capacity and efficiency.Among the inves-tigated configurations,the system performance is most optimal with a three-layer mesh regenerator.Under the conditions of using 6 MPa high-pressure helium gas,a hot end temperature of 923 K,and a room temperature end of 303 K,the refrigera-tion system achieved a cooling capacity of 109 W at 77 K,surpassing the conditions with one,two and four-layer regenera-tors.

关 键 词：热声制冷机 环路 回热器 多层丝网 

分 类 号：TB651[一般工业技术—制冷工程]