为进一步提高相变储能填充床储热性能，运用计算流体力学软件Fluent采用DEMCFD数值模拟方法对轴向填充不同熔点颗粒的填充床进行了储热过程的数值分析。在分别填充了240和480个相变材料颗粒的直径为200 mm的相变储能填充床内，探究沿热流体流动方向分层逐级排布更低熔点相变材料的排布方式对填充床的储能速率、储能效率、热流体和相变储热材料温度分布的影响。研究表明：在轴向分层排布不同相变点的相变材料会对床内轴向温度场有显著影响；分层排布的方式使填充床的储能速率、储能效率均得到了提高，240和480颗粒填充床平均储能速率分别提升约31.0%和25.1%。

In order to further improve the heat storage performance of phase change material (PCM) energy storage packed beds, the heat storage process of packed beds filled with PCM particles of different melting points in the axial direction was analyzed by using Fluent software and DEM CFD numerical simulation method. The effects of the arrangement mode of lower melting point PCMs arranged layer by layer along the direction of heat fluid flow on the energy storage rate, energy storage efficiency and temperature distributions of the heat fluid and PCMs were investigated in an energy storage packed bed with a diameter of 200 mm and filled with 240 and 480 PCM particles, respectively. The results show that the multilayer arrangement of PCMs with different melting points in the axial direction has a significant impact on the axial temperature field inside the bed; the layered arrangement improves the energy storage rate and efficiency to a certain extent, with an average increase in the energy storage rate of about 31.0% and 251% for beds filled with 240 and 480 particles, respectively.

TK124