摘要
采用URANS(Unsteady Reynolds Averaged Navier Stokes)方法对不同棒束结构稠密栅元通道(P/D=1.001～1.2)内的湍流流动进行CFD模拟。研究分析了不同Re(Re=5 000～215 000)的湍流流动的主流速度、壁面剪应力、湍动能等参数。研究表明:在较稠密的棒束(P/D<1.1)通道内,P/D的变化对子通道内主流速度和剪应力分布均有较大影响。本文的模拟结果也验证了在达到临界P/D前(即使δ/D<0.011),交混因子Y和δ/D成反比关系。对于固定的棒束结构(P/D=1.062),当Re达到一定值(Re=9 600)时,子通道内主流速度和剪应力分布对Re的变化不敏感。
In this paper,URANS（Unsteady Reynolds Averaged Navier Stokes） methodology was applied to the prediction of turbulent flow inside tight lattice rod bundles with different P/D ratios,i.e.from 1.001 to 1.2.The turbulent flow with Reynolds number ranging from 5 000 to 215 000 was investigated by analysing the bulk velocity,wall shear stress and turbulent intensity distributions in the subchannel.The results show significant effect of P/D on stream wise velocity and wall shear stress in very tight lattice（P/D1.1）.The results also indicate that the mixing factor（Y） has an inverse proportion relation to δ/D,even though δ/D is smaller than 0.011.When Reynolds number reaches certain value in tight lattice,the bulk velocity and wall shear stress are less sensitive to Reynolds number.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2012年第4期396-403,共8页
Atomic Energy Science and Technology
基金
国家自然科学基金资助项目(50806044)
国家重点基础研究发展计划资助项目(2007CB209804)
