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对某双吸离心泵的双流道叶轮内部的定常三维湍流进行了全流道数值模拟以研究其内部流动规律。计算基于Reynolds时均Navier-Stokes方程,采用了标准k-ε湍流模型,压力速度耦合使用SIMPLE算法。计算得到了叶轮进口和水平截面的速度矢量图、叶片压力面和吸力面以及叶轮盖板的压力分布等值线图,并对其进行了分析。结果表明全流道计算可以较好地模拟双流道叶轮的内部流动,尤其是叶轮进出口的流动,并可对泵的外特性做出预估。计算结果有助于深入了解双流道叶轮内部流动机理,指导叶轮的水力设计。
The full three-dimensional turbulent flow inside a double-flow impeller of a double-suction centrifugal pump was numerically simulated to study its internal flow. Calculations are based on the Reynolds time-averaged Navier-Stokes equations, using a standard k-ε turbulence model, and pressure-velocity coupling using the SIMPLE algorithm. The velocity vector of the impeller inlet and horizontal section, the pressure and surface of the blade and the pressure distribution contours of the impeller cover were calculated and analyzed. The results show that the full runway calculation can simulate the internal flow of the double runner impeller, especially the impeller inlet and outlet flow, and can estimate the external characteristics of the pump. The calculation results help to understand the internal flow mechanism of the double-flow impeller and guide the hydraulic design of the impeller.