本文首先对三维颗粒有序列阵孔隙单元内的湍流特性进行数值研究,并在此基础上采用体积平均方法对多孔介质宏观湍流方程进行改进.结果表明:三维颗粒有序列阵内的湍流特性与二维棒束模型存在较大差异,在相同雷诺数及孔隙率下,颗粒有序列阵多孔介质内由颗粒骨架导致的宏观湍动能及耗散率附加净产生项明显偏低;传统基于二维棒束模型得到的多孔介质宏观湍流模型(N-K模型)高估了湍流方程中k∞/|VD|2和ε∞H/|VD|3项的值,本文对此进行了修正和改进.
In the present paper,the turbulence characteristics inside the pores of three-dimensional periodic array cell of particles are numerical investigated.And the macroscopic turbulence equations in the porous media are modified with volume-averaged method.It is found that,the turbulence characteristics in three-dimensional periodic arrays of particles are quite different from those in two-dimensional arrays of rods.With the same Reynolds number and porosity,the net-production rate of turbulence kinetic energy and its dissipation rate due to the effect of porous matrix in the arrays of particles would be much lower.The traditional correlations based on the two-dimensional rods model would overestimate the dimensionless turbulence quantities k∞/|VD |2and ε∞H/|VD |3 for the arrays of particles,and some modifications are obtained.
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