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采用三维时均ＮａｖｉｅｒＳｔｏｋｅｓ方程和ｋε模型分别模拟了离心通风机内部流场的流动；几何拓扑结构使用多块结构以减少计算机内存的浪费；运用贴体坐标系统描述了复杂的几何边界；使用二阶中心差分以离散扩散项和源项；对于控制方程的对流项的离散，为了克服中心差分在网格Ｐｅ数大于２后解的不稳定和迎风差分时不考虑Ｐｅ影响的缺陷，应用混合差分（ＨＤＳ）格式，并对时间参数采用二阶向后差分；求解方程使用Ｓｉｍｐｌｅ算法．通过这些方法和手段，得出了不同时刻叶轮内流道速度、湍动能及耗散能的分布．这为了解旋转对流道内速度分布、壁面摩擦力和紊流结构等影响提供了理论依据，为离心风机设计、节能改造提供了详细的数据和有效的手段
The three-dimensional Navier-Stokes equations and the k-ε model are used to simulate the flow field inside the centrifugal fan respectively. The geometry topology uses multiple structures to reduce the computer memory waste. The body coordinate system is used to describe the complicated geometric boundaries For the dispersion of convection term of the control equation, in order to overcome the defect that the central difference does not consider the influence of Pe when the grid Pe number is greater than 2 and the instability and windward difference are solved, The hybrid difference (HDS) format is applied and the second order backward difference is applied to the time parameters; the Simple algorithm is used to solve the equation. Through these methods and methods, the distribution of velocity, turbulent kinetic energy and dissipative energy in the impeller at different times is obtained. This provides a theoretical basis for understanding the influence of rotational velocity distribution in the runner, wall friction and turbulence structure, etc., and provides detailed data and effective means for centrifugal fan design and energy saving reform