【作者】 田瑞峰； 毛晓辉； 王小军；

【Author】 TIAN Rui-feng~1,MAO Xiao-hui~1,WANG Xiao-jun~2 (1.College of Nuclear Science and Technology,Harbin Engineering University,Harbin of Heilongjiang Prov.150001,China; 2.National Key Laboratory of Bubble Physics and Nature Circulation,Nuclear Power Institute of China,Chengdu of Sichuan Prov.610041,China)

【机构】 哈尔滨工程大学核科学与技术学院； 中国核动力研究设计院空泡物理和自然循环国防科技重点实验室；

【摘要】 应用数值方法对AFA-2G 5×5格架棒束通道流动进行分析,研究数值方法的应用特性。采用混合网格技术和速度-压力耦合算法(SIMPLEC)求解了雷诺时均的连续性方程、动量方程,得到格架内各截面的速度分布。分析了网格数、模型入口段长度以及标准k-ε模型、k-ω模型和SSTk-ω模型对计算结果的影响。结果表明:对于此类问题的数值模拟,独立解的网格数约为300万,入口段长度取理论确定的最大值是比较合理的。结合理论分析表明,选用SSTk-ω模型对带定位格架的棒束微小通道内的流场进行数值模拟是合适的。更多还原

【Abstract】 Using numerical method,the 3-D single-phase flow field in 5x5 rod bundles with spacer grids was studied. Employing hybrid grids technique and improved SIMPLEC algorithm,the Reynolds averaged mass conservation and momentum conservation equations were solved.With that,the velocity distribution of different section of flow field was obtained.The impact of mesh quantity,inlet length and different turbulent models,k-εmodel、k-ωmodel and SST k-ωmodel, to flow field was analyzed.The simulating results show that,for this simulation problem,the mesh quantity of grid independency was about 300 millions.It also shows that the inlet length should be as large as analytical length.Considering the theoretical analysis,the SST k-ωmodel was suitable to simulate the 3-D single-phase flow field in rod bundles with spacer grids.更多还原