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首页> 外文期刊>Journal of visualization >Unsteady Flow Visualization At Part-load Conditions Of A Radial Diffuser Pump: By Piv And Cfd
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Unsteady Flow Visualization At Part-load Conditions Of A Radial Diffuser Pump: By Piv And Cfd

机译:径向扩散器泵在部分负载条件下的非稳态流动可视化:Piv和Cfd

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摘要

The present study provides flow visualization on complex internal flows in a radial diffuser pump under part-load conditions by using the three-dimensional Navier-Stokes code CFX-10 with Detached Eddy Simulation (DES) turbulence model. Particle Image Velocimetry (PIV) measurements have been conducted to validate numerical results. The CFD results show good agreements with experimental ones on both the phase-averaged velocity fields and turbulence field. The detailed flow analysis shows that no separation occurs at 0.75Q_(des) although a low-velocity zone develops on the rear impeller suction side. Steady flow separations are observed on the impeller suction sides at 0.5Q_(des) but with different onsets and amounts. When reducing the flow rate to 0.25Q_(des), CFD predicts different types of back flows in the impeller region, including steady leading edge separations, rotating vortex in the impeller wake region, and back flow on the impeller pressure side.
机译:本研究通过使用带有分离涡流仿真(DES)湍流模型的三维Navier-Stokes代码CFX-10,提供了在部分负载条件下径向扩散泵中复杂内部流的流动可视化。已经进行了粒子图像测速(PIV)测量以验证数值结果。 CFD结果在相均速度场和湍流场上均与实验结果吻合良好。详细的流量分析表明,尽管在后叶轮吸入侧出现了低速区,但在0.75Q_(des)处未发生分离。在叶轮吸入侧以0.5Q_(des)观察到稳定的流量分离,但起爆次数和流量不同。当将流量降低至0.25Q_des时,CFD会预测叶轮区域中的不同类型的回流,包括稳定的前缘间距,叶轮尾流区域中的旋转涡流以及叶轮压力侧的回流。

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