| Cite this article: | 全莉,刘颖,吴泽昊,等.平面S型轴伸贯流泵装置泵内流动特性研究[J].灌溉排水学报,0,():-. |
| Quan Li,Liu Ying,Wu Zehao,et al.平面S型轴伸贯流泵装置泵内流动特性研究[J].灌溉排水学报,0,():-. |
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| Study on flow characteristics in plane S-type axial extension tubular pump |
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Quan Li, Liu Ying, Wu Zehao, Yan Jie
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扬州市勘测设计研究院有限公司
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| Abstract: |
| Aiming at the pressure pulsation characteristics and flow stability in the plane S-type pump device of low lift pump station, this paper uses the software CFX to carry out three-dimensional full channel numerical simulation. The flow characteristics, pressure pulsation and vorticity distribution in the pump device under different flow conditions are analyzed. The results show that the flow pattern in the inlet channel is stable, and the flow condition mainly affects the flow stability in the outlet channel. The excitation source of pressure pulsation in the impeller is the rotation of the impeller. There are high-order harmonics of blade frequency at the inlet of the impeller, while the amplitude of high-order harmonics at the outlet of the impeller is small, the frequency component at the outlet of the guide vane is complex, and there are obvious low-frequency pulsations. The flow vorticity in the inlet passage is 0, and the vorticity in the impeller chamber, guide vane chamber and outlet passage is very different. Due to the rotation disturbance of the impeller, the vorticity in the flow field in the impeller chamber and guide vane chamber is the largest. Under the condition of small flow, the difference of vorticity between the pump section and the outlet channel is the largest, and the vorticity decreases with the increase of flow. The law of vorticity distribution is consistent with the change of flow pattern in the pump device, which explains the reason for the difference of flow stability under different flow conditions from the perspective of energy. The research results provide theoretical guidance for fully understanding the flow characteristics and flow stability mechanism in the plane S-type pump device, and provide reference for engineering operation. |
| Key words: Plane S-type axial extension tubular pump; Vorticity; Pressure pulsation; Flow characteristics; numerical simulation |
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