摘要
对不同规模的有序堆积球床结构进行建模,并使用计算流体力学(CFD)方法对球床孔隙通道内的单相流动进行数值模拟。球床结构的孔隙区域采用混合网格划分策略,球床的计算规模达到11层,共141个颗粒,能够较真实地反映较大规模球床内部的孔隙流动特性。同时考察了球床的规模大小对其孔隙流动以及床层流动压降的影响规律,获得不同径向规模体心堆积球床的阻力关系式。针对截面积较小的方形通道分析了边壁效应对孔隙流动的影响机理,并通过孔隙流道的沿程压降评估了球床入口/出口效应对床层阻力的影响范围。
Numerical simulations were taken on single phase flow in a structured packed bed on different scaling using CFD modeling. The point contact between adjacent spheres was simplified with a new grid-generation method, and over 11 layers of spheres were calculated, 141 particles in all, which represents flow characteristics of a large scale packed bed in the real system. The scaling effect on the flow characteristics and pressure drop was investigated, and the resistance formulas on different scales were obtained. The mechanism of boundary effect on flow characteristics of a small channel was studied and the scope of the inlet/outlet effect on resistance characteristics is evaluated by the pressure drop on axial direction.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2013年第2期25-29,共5页
Nuclear Power Engineering
基金
核反应堆系统设计技术重点实验室运行课题(ZDSY-ZSYX-1012001)
关键词
球床规模
有序堆积
CFD
阻力特性
Pebble bed scale, Structured packed bed, CFD, Resistance characteristics
