排灌机械工程学报

作者：SONG Xijie，LIU Chao

单位：School of Hydraulic Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225100, China

关键词：axial-flow pump, pump sump, vortex, pressure fluctuation, model experiment

In order to study the mechanism of the vortex generation at the bottom of the pump sump below the flare tube, twenty pressure pulsation monitoring points were arranged at the bottom of the pump sump below the flare tube, and the pressure fluctuation experiments were carried out under different flow conditions. The experimental results show that the frequency of pressure fluctuation at the bottom of the pump sump is twice of the rotational frequency of the impeller blade; the vortex below the flare tube is easy to generate under the large flow conditions mainly concentrated at the right front position below the flare tube. The position of the vortex occurring is corresponding to the position of the low-pressure region below flare tube.

来源：2019年第9期

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