摘要
为有效提升棒束通道内流动特性模拟的计算效率,本研究以5×5棒束恒温流动基准题MANIVEL为研究对象,基于计算流体动力学(CFD)中的雷诺时均(RANS)湍流模型提出了一种周期性计算优化方法,可同时模拟棒束组件出口段的速度分布和压降结果。采用2种不同计算域(入口域和单元域)进行周期性计算,生成充分发展的湍流分布后将其定义为跨度单元的入口边界条件开展常规流体力学计算。将不同轴向位置的速度分布和整个计算域的压降与实验数据对比,研究结果表明,2种不同入口边界条件设置下速度分布和压降结果都有细微差别,但并不显著。因此,虽然格架的影响还存在于下游流动中,但在误差允许范围内可以使用入口域进行周期性计算,该方法可同时模拟棒束组件出口段的速度分布和压降结果。
To effectively improve the computational efficiency of simulating flow characteristics in rod bundle channels,this study takes the 5×5 isothermal rod bundle benchmark MANIVEL as the research object.Based on the Reynolds-Averaged Navier-Stokes(RANS)turbulence model in computational fluid dynamics(CFD),an optimization methodology for periodic computation is proposed,which can simultaneously simulate the velocity distribution and pressure drop in the outlet section of the rod bundle assembly.Two different computational domains(an inlet domain and a unit domain)are used for periodic computation.After generating a fully developed turbulent flow distribution,it is defined as the inlet boundary condition for the span unit to perform CFD calculations.By comparing the velocity distributions at different axial positions and the pressure drop across the entire computational domain with experimental data,it was found that there are slight differences in velocity distribution and pressure drop under the two different inlet boundary conditions,but the differences are not significant.Therefore,although the influence of grid spacers persists in the downstream flow,the inlet domain can be used for periodic computation within an allowable error range.This method can simultaneously simulate the velocity distribution and pressure drop in the outlet section of the rod bundle assembly.
作者
邱初发
张廷
谢添舟
徐建军
Qiu Chufa;Zhang Ting;Xie Tianzhou;Xu Jianjun(State Key Laboratory of Advanced Nuclear Energy Technology,Nuclear Power Institute of China,Chengdu,610213,China)
出处
《核动力工程》
北大核心
2025年第S2期129-135,共7页
Nuclear Power Engineering
