混流式水轮机蜗壳·导叶及转轮内部水流的二维与三维数值模拟比较分析

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-WJ-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。

Comparative Analysis on Two-dimensional and Three-dimensional Numerical Simulation of Internal Flow of Volute,Guide Vane and Turning Wheel of Axial Flow Turbine

Based on N-S equation and standard k-ε turbulence model,CFD computational fluid dynamics software was adopted in two-dimensional 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.