采用数值计算方法研究了流经静止球形颗粒的湍流流动。考察了不同湍流模型 (标准 k-ε模型、RNG k-ε模型和 Realizable k-ε模型 )对后台阶流动的计算结果的准确性 ,从中选取表现比较优越的 RNG k-ε模型对颗粒附近的湍流流动进行详尽的数值模拟。计算中湍流度取为 10 %～ 80 %之间 ,湍流尺度为 10 -5～ 4m。发现湍流尺度的变化对曳力系数的影响比较小 ,只是在小尺度条件下存在一定影响 ;而湍流度对颗粒曳力系数产生较大的增强作用 ,尤其在小颗粒Rep 条件下。得出的结论与以往文献不同 ,有待于更广泛的实验与理论方面的检验 The turbulent flow through stationary spherical particles is studied numerically. The veracity of the results of the backstepping flow with different turbulence models (standard k-ε model, RNG k-ε model and Realizable k-ε model) is investigated. The RNG k-ε model, Turbulent flow for detailed numerical simulation. In the calculation, the turbulence is taken as 10% ~ 80%, and the turbulence scale is 10 -5 ~ 4m. It is found that the change of turbulence scale has a small effect on drag coefficient, but only a small effect on turbulence. Turbulence has a great effect on particle drag coefficient, especially in the case of small particle Rep. The conclusion drawn is different from the previous literature, to be more extensive experimental and theoretical aspects of the test