蓄热过程传热特性的影响，选取赤藻糖醇作为相变材料，首先利用实验方法验证数值模型的准确性，其次采用焓-多孔介质的方法对相变储能单元进行仿真计算，主要研究了翅片，以及翅片长度、翅片数量和翅片厚度等几何参数对蓄热过程中传热特性的影响。研究结果表明：添加翅片后，在翅片区域形成不同尺寸的涡，改善了流场分布，增强了液态相变材料自然对流的效果，使储能装置总蓄热时间比无翅片缩短了43%；在翅片参数的设计中，增加翅片长度可以有效缩短总蓄热时间，随着翅片长度的增加，总蓄热时间变化率减小；随着翅片数量的增加，换热面积增大，熔化速率增大，总蓄热时间缩短；随着翅片厚度的增加，储能速率加快，总蓄热时间缩短，且翅片厚度越厚，总熔化时间的变化率越大。

In order to study the influence of fins on the heat transfer characteristics of Erythritol（C4H10O4）,in this paper,fucitol was selected as phase change material.First of all,the accuracy of the model was validated by experimental method.Then enthalpyporous media simulation analysis was carried out for the finned phase change energy storage unit.The effects of geometric parameters such as fin,fin length,fin number and fin thickness on temperature,liquid phase distribution and heat storage time were studied.The results show that: after adding fins,vortexes of different sizes are formed in the finned area,the flow field distribution is improved,the natural convection effect of liquid phase change material is enhanced,and the total heat storage time of the energy storage device is shortened by 43% compared with that without fins; In the design of fin parameters,increasing the fin length can effectively shorten the total heat storage time,that is,with the increase of fin length,the change rate of total heat storage time is smaller; With the increase of fin thickness,the energy storage rate increases and the total heat storage time shortens,and the thicker the fins,the greater the change rate of the total melting time.

TK11

国家自然科学基金项目（面上52079118）；四川省（境）外高端人才引进项目（SYZ202073）