分形翅片对三套管相变蓄热器蓄热性能的影响  

Effect of fractal fins on the heat storage performance of three-casing phase change accumulator

作　　者：唐广通 李欣 蒋静智[2] 李路江 邵国伟 李洪涛[2] 程思远 TANG Guangtong;LI Xin;JIANG Jingzhi;LI Lujiang;SHAO Guowei;LI Hongtao;CHENG Siyuan(State Grid Hebei Energy Technology Service Co.,Ltd,Shijiazhuang,Hebei 050000,China;School of Mechanical Engineering,Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China)

机构地区：[1]国网河北能源技术服务有限公司,河北石家庄050000 [2]河北科技大学机械工程学院,河北石家庄050018

出　　处：《河北科技大学学报》2024年第6期573-581,共9页Journal of Hebei University of Science and Technology

基　　金：国家自然科学基金(52206224);国网河北能源技术服务有限公司科技项目(TSS2023-10);河北省高等学校科学技术研究项目(ZD2022023)。

摘　　要：为解决传统蓄热器蓄热时相变材料(PCM)区域存在蓄热效率低、熔化不均匀等问题,以加装了8根纵向翅片的三套管相变蓄热器为基本结构,保证翅片在蓄热器内所占体积不变,纵向翅片以“Y”字进行分形,利用FLUENT软件模拟研究Y形翅片长度、分支角度对三套管相变蓄热器蓄热性能的影响。结果表明:三套管相变蓄热器添加分形翅片后,与添加了普通纵向直翅片的结构相比,增大了换热面积,有利于自然对流的发展,有效缩短了PCM完全熔化所需时间;综合分析可得,Y形翅片根部与分支分别占总长度的25%与75%、分支角度为60°时为最佳Y形翅片结构,PCM完全熔化速率明显提高,整体蓄热性能得到提升。与普通直翅片蓄热器相比,提出的Y形翅片相变材料受热更加均匀,蓄热速率更快,其数值模拟结果可为相变蓄热器的结构优化设计提供一定的参考依据。In order to solve the problems of low heat storage efficiency and uneven melting in the phase change material area of the traditional heat accumulator,the influence of the length and branch angle of the Y-shaped fin on the heat storage performance of the three-tube phase change accumulator was simulated and studied by using FLUENT software to simulate the effects of the length and branch angle of the three-tube phase change accumulator with eightlongitudinal fins as the basic structure,ensuring that the volume of the fins in the accumulator remains unchanged,and the longitudinal fins are fractal with the"Y"shape.The results show that the addition of fractal fins in the three-tube phase change accumulator increases the heat exchange area compared with the ordinary longitudinal straight fin structure,which is conducive to the development of natural convection and effectively shortens the time required for the complete melting of PCM.After comprehensive analysis,the root and branches of the Y-shaped fin accounts for 25%and 75%of the total length,respectively,and the branch angle is 60°,which is the best Y-shaped fin structure,the complete melting rate of PCM is significantly improved,and the overall heat storage performance is improved.Compared with the ordinary straight fin heat accumulator,the proposed Y-shaped fin has more uniform heating of the phase change material and faster heat storage rate.The numerical simulation results provide certain data basis for the structural optimization design of the phase change heat accumulator.

关 键 词：传热学 相变蓄热 分形翅片 数值模拟 强化换热 自然对流 

分 类 号：TK172[动力工程及工程热物理—热能工程]