为探求蜗壳内部的流动规律 ,优化蜗壳设计 ,对三峡混流式水轮机组模型蜗壳和固定导叶内部的流动进行了紊流解和 Euler解的全三维数值模拟。文中基于 Navier-Stokes方程的标准 k-ε紊流模型、Euler方程模型 ,采用贴体座标和交错网格系统 ,用 SIMPL EC算法 ,对蜗壳和固定导叶内部流动的联合计算结果进行对比分析 ,并与实验值进行了比较。还对流动的不均匀性进行分析 ,提出了改进和优化蜗壳和固定导叶设计的较为可信的解决方案 In order to explore the flow pattern inside the volute and to optimize the volute design, the turbulent flow and the Euler solution of the three-gorge Francis turbine were analyzed by turbulent flow and Euler method. The standard k-ε turbulence model and the Euler equation model based on the Navier-Stokes equation are used in this paper. The fitted coordinates and the staggered grid system are adopted. The SIMPL EC algorithm is used to compare the calculated results of the internal flow of the volute and the fixed vane Analysis, and compared with the experimental value. The inhomogeneity of the flow is also analyzed, and a more credible solution to improve and optimize the design of the volute and the fixed vane is presented