带格架棒束通道交混湍流数值模拟研究  

Numerical Simulation of Mixing Turbulent Flow in Rod Bundle with Spacer Grids

作　　者：魏宗岚 张渝[1] 刘松涛[1] 马强 

机构地区：[1]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213 [2]中海油研究总院,北京100028

出　　处：《核动力工程》2015年第4期158-162,共5页Nuclear Power Engineering

摘　　要：采用雷诺时均模拟(RANS)和大涡模拟(LES)对MATi S-H实验进行模拟计算,得到格架交混后棒束通道内冷态单相湍流流场,通过比较格架下游特定位置处速度分量分布,发现采用精细网格的LES能够较为准确地计算湍流流场平均速度以及脉动速度的分布,与实验结果符合较好。LES结果表明,棒束通道内格架交混湍流流场具有明显的波动,脉动峰值离散分布;子通道内瞬时时刻的涡旋因子SM沿轴向也并非单调衰减,而是具有相对持续的脉动特征,最大脉动值大约是SM最大值的5%;LES的瞬时速度场计算结果可以为进一步的力学分析提供参考。The purpose of the present paper is to evaluate the validity of CFD, especially Large Eddy Simulation （LES）, to simulate the OECD/NEA benchmark experiment MATiS-H. The 5x5 rod bundle with a split-type spacer grid is simulated by both steady and transient simulation and the numerical results of time averaged and root-mean-square velocity field are compared to the experimental data. It is demonstrated that LES can better describe the mixing turbulent flow velocity field than the RANS method. The mesh sensitivity analysis further reveals that LES with fine mesh is more appropriate for analyzing the turbulent flow field in the rod bundle with spacer grids. LES results help understand the mixing turbulence characteristics with the mixing effect evaluation in transient. The simulated flow field data can also be of value for mechanical evaluations such as flow-induced vibration and grid-to-rod-fretting phenomenon.

关 键 词：计算流体力学 大涡模拟 湍流 格架 棒束通道 

分 类 号：TL334[核科学技术—核技术及应用]