Based on N-S equation and standard k-ε turbulence model, CFD computational fluid dynamics software was adapted in two-di mensional steady numerical simulation for internal flow of volute, guide vane and turning wheel of HLA616-WJ-55 axial flow turbine, and the results were compared and analyzed with three-dimensional numerical simulation of the same turbine type. The results showed that the internal flow rule of volute of two-dimensional was consistent with three-dimensional numerical simulation, and the distribution of pressure and speed were uniform, the flow condition was better. Two-dimensional CFD analysis could predict the structures of internal flows of volute, guide vane and turning wheel roundly, and numerical simulation results had important directive significance to turbines selection and optimization design.%基于N-S方程和标准k-ε紊流模型,采用CFD计算流体力学软件对HLA616 -W J-55混流式水轮机原型机的蜗壳、导叶及转轮内部水流进行二维定常数值模拟,并与同型式水轮机的蜗壳、导叶及转轮内部流动三维数值模拟结果进行比较分析.结果表明,二维与三维蜗壳内部流动的规律基本一致,压力分布和速度分布比较均匀,流动状况较为理想.二维CFD分析能较全面地预测水轮机蜗壳、导叶及转轮内部流场的结构,数值模拟结果对水轮机选型和优化设计均具有重要的指导意义.
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