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分形翅片相变传热特性及优化

许泽 邢玉明 殷健宝 侯煦 王仕淞

许泽, 邢玉明, 殷健宝, 等. 分形翅片相变传热特性及优化[J]. 航空动力学报, 2024, 39(X):20230454 doi: 10.13224/j.cnki.jasp.20230454
引用本文: 许泽, 邢玉明, 殷健宝, 等. 分形翅片相变传热特性及优化[J]. 航空动力学报, 2024, 39(X):20230454 doi: 10.13224/j.cnki.jasp.20230454
XU Ze, XING Yu-ming, YIN Jianbao, et al. Heat transfer characteristics and optimization of fractal fin during phase change[J]. Journal of Aerospace Power, 2024, 39(X):20230454 doi: 10.13224/j.cnki.jasp.20230454
Citation: XU Ze, XING Yu-ming, YIN Jianbao, et al. Heat transfer characteristics and optimization of fractal fin during phase change[J]. Journal of Aerospace Power, 2024, 39(X):20230454 doi: 10.13224/j.cnki.jasp.20230454

分形翅片相变传热特性及优化

doi: 10.13224/j.cnki.jasp.20230454
详细信息
    作者简介:

    许泽(1999-),男,硕士生,主要从事相变材料、换热器和蓄热体方面研究。E-mail:yxdxz@buaa.edu.cn

    通讯作者:

    邢玉明(1966-),男,教授,博士生导师,博士,主要研究方向为制冷及低温工程。E-mail:补充

  • 中图分类号: V259;TK124

Heat transfer characteristics and optimization of fractal fin during phase change

  • 摘要:

    相变材料的低导热率制约了潜热储热系统的效率,提出了一种新型分形翅片改善潜热储热系统的相变传热特性。建立二维管壳潜热储热系统模型,利用焓-多孔介质法进行瞬态模拟,研究了嵌入分形翅片对系统凝固性能的影响,分形翅片长度比和分支角对凝固过程影响显著,分形翅片加快了相变材料的凝固,使系统温度分布更加均匀。与直翅片相比,分形翅片显著强化了系统的换热性能,采用人工神经网络对数据进行拟合,以液相百分数为优化目标,通过遗传算法得到优化后的翅片结构:最佳长度比为1.425,两分支角分别为50°和30°;优化后分形翅片系统的凝固时间比直翅片系统减少76.9%。对分形翅片参数进行了敏感度分析,结果表明长度比对系统凝固时间的影响更大,1级分支角次之,更应关注这两个参数的变化对凝固时间的影响。

     

  • 图 1  树状分形翅片的构建

    Figure 1.  Construction of fractal fin

    图 2  几何模型示意图

    Figure 2.  Schematic diagram of geometric model

    图 3  数值模拟与文献结果对比

    Figure 3.  Comparison between numerical simulation and literature result

    图 4  网格无关性和时间步长无关性分析

    Figure 4.  Grid independence and time step independence analysis

    图 5  计算域

    Figure 5.  Computational domain

    图 6  神经网络结构图

    Figure 6.  Structure of the neural network

    图 7  拟合结果

    Figure 7.  the fitting result

    图 8  遗传算法流程图

    Figure 8.  process of genetic algorithm

    图 9  分形翅片与直翅片液相及温度分布Fig.9solid phase and temperature distribution of fractal fin and radial fin

    图 10  分形翅片与直翅片液相百分数及温度变化曲线

    Figure 10.  liquid fraction and temperature of fractal fin and radial fin

    图 11  分形翅片与直翅片温度方差对比

    Figure 11.  the comparison diagram of temperature variance between fractal fin and radial fin

    图 12  翅片参数对熔化时间的一阶灵敏度

    Figure 12.  First order sensitivity index of fin parameters to the solidification time

    图 13  翅片参数对凝固时间的二阶灵敏度

    Figure 13.  Second order sensitivity index of fin parameters to the solidification time

    表  1  材料的热物理性质

    Table  1.   Thermophysical properties of materials

    热物性参数 月桂酸 铝合金
    密度/(kg/m3 869 2703
    比热容(J/(kg∙K)) 1760(固)/2150(液) 963
    熔点/(K) 315~317
    潜热/(kJ/kg) 178.7
    导热系数/(W/(m∙K)) 0.22(固)/0.16(液) 180
    黏度/(Pa∙s) 0.001
    下载: 导出CSV

    表  2  翅片参数对凝固时间的一阶灵敏度

    Table  2.   First order sensitivity of fin parameters to solidification time

    翅片参数主效应指标总效应指标
    长度比0.1850.675 9
    0级分支角0.076 40.642 9
    1级分支角0.143 10.480 6
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-07-14
  • 网络出版日期:  2024-06-05

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