【摘要】 为了提高蓄热装置内相变球的放热效率，该文设计了一种表面有螺旋凹槽的相变球并建立了三维模型，用ICEM CFD进行网格划分，完成网格无关性验证后，在fluent中分别数值模拟了一种基于螺旋凹槽相变球和光滑相变球的相变储热装置在进口温度T_in=313 K，进口流速u=0.15 m/s，初始温度T₀=353 K工况下的放热过程，得到了放热过程中相变材料（PCM）温度、液相率和平均表面传热系数随时间的变化曲线，截取了放热过程中某一时刻的水流速度矢量图和液相率云图，并探究了入口流速对PCM凝固时间的影响。研究结果得出：与光滑相变球蓄热装置相比，凹槽相变球蓄热装置内PCM凝固时间缩短了20%，放热时间缩短了37.5%。且入口流速较小时，提高入口流速可有效提高PCM凝固效率。更多还原

【Abstract】 In order to improve the heat release efficiency of the phase change sphere in the heat storage device,a phase change sphere with a spiral groove on the surface is designed and a three-dimensional model is established.The grid is divided by ICEM CFD to complete the grid independence verification.In the fluent,a phase change heat storage device based on spiral groove phase change sphere and smooth phase change sphere is simulated at the inlet temperature T_in=313K,the inlet flow velocity u=0.15m/s,and the initial temperature T₀=353K.Under the exothermic process under working conditions,the temperature change,liquid phase rate and average surface heat transfer coefficient of the phase change material（PCM）during the exothermic process are obtained,and the water flow velocity vector at a certain moment in the exothermic process is intercepted.Graph and liquid phase cloud map,and explored the effect of inlet flow rate on PCM solidification time.The results show that compared with the smooth phase change ball thermal storage device,the PCM solidification time in the groove phase change ball thermal storage device is shortened by 20%,and the heat release time is shortened by 37.5%.When the inlet flow rate is small,increasing the inlet flow rate can effectively improve the PCM solidification efficiency.更多还原