为研究空气流入高温填充床时小球直径和空气流速变化对填充床内对流换热和压力损失等的影响，利用孔隙尺度介观方法对顺序排列多孔介质小球的三维填充床进行数值计算，数值计算与实验结果吻合较好。结果表明：填充床内固相和气相间存在热的非平衡性；当小球直径从2.8增大到5.6 mm时，在最高温度上游对流换热强度减小，在最高温度下游对流换热强度增大，同时，压力损失和最大无量纲速度减小；气体流速增大时，填充床内产生湍流运动。

Pore scale mesoscopic method was used to numerically calculate the influence of the variation of pellet diameter and air velocity on convective heat transfer and pressure loss of orderly arrangement porous medium sphere arranged in a 3D packed bed,which is under the conditions of the hightemperature inside the packed bed.The simulation values qualitatively agree with the experimental data.The results show that there is thermal nonequilibrium between the solid phase and gas phase of the packed bed.When the pellet diameter is from 2.8 to 5.6 mm,the convective heat transfer intensity is relative low at the upstream of the maximum temperature; heat transfer intensity is more intense at the downstream of the maximum temperature.Meanwhile,the pressure loss and the maximum dimensionless velocity decrease gradually.Turbulent motion occurs in the packed bed when the gas velocity increases.

TK124

国家自然科学基金(51876107)