锯齿型翅片内不同温区氦气流动与传热性能对比及节距对翅片性能影响的研究  

Numerical Investigation on Heat Transfer and Flow Performances of Helium Gas in Serrated Fins Channels

作　　者：邹中宇 张启勇[1] 朱志刚[1] 杨鹏程 罗浩 ZOU Zhongyu;ZHANG Qiyong;ZHU Zhigang;YANG Pengcheng;LUO Hao(Hefei Institute of Physical Science,Chinese Academy of Science,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院合肥物质科学研究院,合肥230031 [2]中国科学技术大学,合肥230026

出　　处：《真空与低温》2024年第3期274-281,共8页Vacuum and Cryogenics

基　　金：国家自然科学基金(12205337);国家重大基础研究设施-聚变堆主机关键系统综合研究设施(2018-000052-73-01-001228)。

摘　　要：为分析板翅式换热器在低温工况下的流动换热性能与常温工况下的差异和翅片节距对其性能影响,建立氦气在锯齿翅片通道内流动与传热的数值模型,开展数值模拟分析。结果表明:低温氦气在锯齿型翅片通道内的传热性能优于常温氦气。在氦气入口温度为20 K时,j因子比300 K时提升1.1%~55.9%,比77 K时提升0.41%~13.01%;在氦气入口温度为77 K时,j因子比300 K时提升0.53%~38.47%。低温氦气在锯齿型翅片通道内的流动性能比常温氦气差。在氦气入口温度为20 K时,f因子比300 K时高16.84%~28.87%,比77 K时高3.98%~23.19%。翅片节距大小在不同温区下对翅片流动与传热性能均有显著影响。在不同温区下,j因子随着翅片节距增大而减小,f因子随着翅片节距减小而增大。低雷诺数时,JF因子随着翅片节距减小而增大,而高雷诺数时则出现相反的趋势。In order to analyze the difference in flow and heat transfer performance of plate-fin heat exchangers under low temperature conditions and normal temperature conditions,as well as the influence of fin interrupted length,a numerical model of heat transfer and flow of helium gas in serrated fin-channels was established,and numerical simulation analysis was carried out.The results show that the heat transfer performance of low-temperature helium gas in the serrated fins channels is superior to that of normal-temperature helium gas.When the helium gas inlet temperature is 20 K,the j factor increases by 1.1%to 55.9%compared to 300 K,and increases by 0.41%to 13.01%compared to 77 K.When the helium gas inlet temperature is 77 K,the j factor increases by 0.53%to 38.47%compared to 300 K.The flow performance of low-temperature helium gas in the serrated fins channels is worse than that of normal-temperature helium gas.When the helium gas inlet temperature is 20 K,the f factor is 16.84%to 28.87%higher than that at 300 K,and 3.98%to 23.19%higher than that at 77 K.The fin interrupted length has a significant impact on the heat transfer and flow performance of the fins in different temperature regions.In different temperature regions,the j factor decreases with the increase of fin interrupted length,while the f factor increases with the decrease of fin interrupted length.When the Reynolds number is low,the JF factor increases with the decrease of fin interrupted length,while the opposite trend appears when the Reynolds number is high.

关 键 词：锯齿型翅片 流动与传热性能 数值模拟 氦低温系统 板翅式换热器 

分 类 号：TB61.1[一般工业技术—制冷工程]