内置间断扭曲肋的三套管相变蓄热器的充热性能研究  

Thermal performance analysis of triplex tube regenerative heat exchanger accumulator with built-in interrupted twisted fins

作　　者：谢尚奎 林志敏[1,2] 侯博 王良璧[1,2] Xie Shangkui;Lin Zhimin;Hou Bo;Wang Liangbi(School of Mechanical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Rail-way Vehicle Thermal Engineering of MOE,Lanzhou 730070,China)

机构地区：[1]兰州交通大学机电工程学院,甘肃兰州730070 [2]铁道车辆热工教育部重点实验室,甘肃兰州730070

出　　处：《可再生能源》2025年第3期324-332,共9页Renewable Energy Resources

基　　金：甘肃省高等学校产业支撑计划项目(2023CYZC-37)。

摘　　要：针对蓄热器内填充的相变材料热导率低、充热时间长等缺点,文章建立了同心三套管相变蓄热器内置间断扭曲肋的模型,使用Fluent软件对其内部相变材料熔化过程进行三维非稳态数值模拟,对比、分析此结构在不同扭曲肋头数和扭曲程度的条件下,相变材料液相率、平均温度、充热量和平均充热率随时间变化规律。结果表明:在研究参数范围内,随着扭曲程度的增大,相变材料完全熔化时间逐渐缩短,当扭率为2.5时完全熔化时间最大可减少33.1%;随着扭曲肋头数的增加,相变材料完全熔化时间同样逐渐缩短,当扭曲头数为4时完全熔化时间最大可减少25.6%。间断扭曲肋的加入使相变材料完全熔化时间明显缩短,充热能力有所增强,有助于提高三套管相变蓄热器综合性能。For the accumulator filled with phase change material thermal conductivity is low, heat storage time is long and other shortcomings, this paper establishes the concentric triplex tube regenerative heat exchanger built-in intermittent twisted fin model, the use of Fluent software for the melting process of the internal phase change material for the three-dimensional unsteady numerical simulation of the structure of the structure of the different twisted fin number and the degree of twisted degree, analyze the phase change material liquid phase rate, the average temperature, the amount of heat storage and the average heat storage rate rule of law with time.Simulation re-sults show that in this paper, compared with the triplex tube regenerative heat exchanger within the research parameters, with the in-crease of the degree of twist, the complete melting time is gradually shortened, when the twist rate is 2.5, the complete melting time can be reduced by up to 33.1%, with the increase in the number of twisted fins can also shorten the complete melting time, when the number of twisted fins is 4 complete melting time can be reduced by a maximum of 25.6%. The inclusion of intermittent twisted fin sig-nificantly shortens the complete melting time of the phase change material and enhances the heat storage capacity, which helps to im-prove the comprehensive heat storage performance of the triplex tube regenerative heat exchanger.

关 键 词：相变储热 三套管式相变蓄热器 熔化 扭曲肋 数值模拟 

分 类 号：TK519[动力工程及工程热物理—热能工程]