轴伸式贯流泵装置全流场三维湍流数值模拟

为探讨轴伸式贯流泵装置双向运行时的内部流动结构并进行性能预测，应用三维湍流Navier-Stokes、Realizable 两方程湍流模型、壁面函数法和滑移网格技术，进行泵装置双向运行时的全流场三维湍流数值模拟研究。计算所采用的模型贯流泵具有特定的S形叶片及正向运行时的后置弯曲导叶。研究结果揭示了贯流泵装置正、反向运行时的全流道速度等值线、静压等值线、出水流道断面矢量及出水流道的流线形状特征，探讨在泵装置实际安装条件下泵与流道的相互影响，进行泵装置性能的数值模拟预测，并与试验结果进行比较分析。数值模拟结果表明，泵段的出口流态及导叶对流道的流动结构有很大的影响，扩散形流道对流道进口流态反映敏感，无导叶的直形泵装置出口扩散流道内的流动为轴向旋涡、环形旋涡、轴向流动的叠加，数值模拟计算预测泵装置性能的方法是有效、可行的，能够满足工程需要。

NUMERICAL SIMULATION OF 3D VISCOUS FLOW IN TUBULAR PUMPING STATION ON DUAL-DIRECTIONAL OPERATION

The investigation of the three-dimensional fluid flow inside a tubular pumping station on dual-directional operation is described, based on the Reynolds time-averaged Navier-Stokes equations and the Realizable k-ε turbulent flow model, applying the law-of-the-wall and sliding mesh technique. The pump model with “S” shape impeller vanes and bend guide-vanes behind the impeller was used. The main phenomena existent in pressure contours, velocity contours, velocity vectors and flow lines was showed. The influence of one another on pump with channel was discussed in the condition of installation in fact. The performance of the pumping station was estimated, and was compared with test data. The results of the simulation indicate the disturbance of flow at pump outlet to be a great influence on the flow of the discharge channel, the flow in diffuser channel to be a greater sensitivity on inlet flow, this flow inside straight outlet channel of no guide-vanes to be composed of axial-whirling flow, circulation-vortex flow and axial-flow. There is more loss of head in discharge diffuser of the channel, comparing with that of the suction reducer. It is possible to predict correctly tubular pumping station performance by numerical simulation.