摘要
本文采用CFD方法对棒束内的流动状况进行非稳态模拟,利用已知的实验结果对计算模型进行验证,详细分析了非均匀壁面粗糙度条件下雷诺数对冷却剂交混流动特性的影响。结果表明:非均匀壁面粗糙度对棒柬间速度场分布及交混系数有明显的影响。并且,当流动雷诺数提高时,棒束间的交混强度先增强然后减弱,存在一个最佳的流动雷诺数条件,在此雷诺数下,非均匀壁面粗糙度棒束间的湍流交混和相干涡结构最强烈。
In this paper, the unsteady flow in rod bundles was simulated with computational fluid dynamics （CFD） code. The numerical simulation was validated by comparing numerical results with experimental data. In non-uniform wall roughness bundles, the effect of Reynolds number on coolant mixing was analyzed. The results show that non-uniform wall roughness has significant effect on velocity distribution and mixing coefficient in subchannels. As the Reynolds number increases, the coherent structure and flow oscillation increase firstly and then decay. An optimum Reynolds number exists. Under this Re condition, coolant mixing and coherent structure are strongest.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2016年第11期2338-2343,共6页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51206183)
