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本文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欧拉解的全三维数值模拟,以探求蜗壳内部的流动规律,优化蜗壳设计。文中基于 Navier-Stokes 方程的标准 k-ε紊流模型和欧拉方程模型,采用贴体坐标和交错网络系统,用 SIMPLEC 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。最后对流动的不均匀性进行了分析,首次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 this paper, full three-dimensional numerical simulation of turbulent flow and Euler’s solution are carried out for the flow inside the volute and the fixed guide vane of the Three Gorges Francis turbine to explore the flow pattern inside the volute and optimize the volute design. In this paper, the standard k-ε turbulence model and the Euler equation model based on the Navier-Stokes equation are adopted. The fitted coordinates and the staggered grid system are adopted. The SIMPLEC algorithm is used to compare and analyze the joint calculation results of the internal flow of the volute and the fixed guide vane. And compared with the experimental value. Finally, the flow inhomogeneity is analyzed, and for the first time a more credible solution to improve and optimize the volute and the fixed vane design is proposed.