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| Influence of relative position of diffuser leading edge on pressure pulsation in mixed-flow pump |
| HU Bo1, ZHANG Shuangquan1*, SUN Zhixiang2 |
| 1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China; 2. State Grid Jiangxi Yulin Hydropower Plant, Jiujiang, Jiangxi 332000, China |
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Abstract A mixed-flow pump is taken as the research object, and the influence of relative position of diffuser leading edge on the hydraulic performance and internal pressure fluctuation of the pump is investigated. Steady and unsteady flow simulations were performed based on ANSYS CFX software using the k-ω turbulence model. When the relative position of diffuser inlet edge is changed, the hydraulic performance of the pump was predicted by using numerical simulation and four cases were selected to analyze the pressure pulsation in the pump. The results show that the hydraulic performance of the pump rises firstly and then decreases with increasing angle α between the impeller trailing edge and the diffuser leading edge. Especially, at α=5°, the hydraulic performance is the optimal. The change of angle α has an influence on the pressure pulsation amplitude inside the pump. The larger the angle α, the smaller the pressure pulsation. The change of the angle α also affects the pressure pulsation amplitude of the main frequency inside the pump. At the impeller inlet and outlet, the larger the angle α, the smaller the amplitude of them in frequency; inside the volute, however, there is not an obvious rule. With the increase of angle α, the pressure pulsation near the volute tongue is less affected by the impeller rotation but more by the tongue. These results can provide a reference for optimal design of the diffuser in a mixed-flow pump.
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Received: 29 August 2019
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