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| Influence of outlet edge position of diffuser vane on performance of deep-well centrifugal pump |
| ZHOU Ling1, YANG Yang1, SHI Weidong1, LU Weigang1, YE Daoxing2 |
| 1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu, Sichuan 610039, China |
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Abstract In order to study the effect of the outlet edge position of the diffuser vane on the performance of deep-well centrifugal pump, by the numerical simulation and performance test, the 100QJ30 type deep-well centrifugal pump was taken as the experimental object. Under the condition that the main geometrical parameters of the diffuser vanes were not changed, three different diffusers were determined by adjusting the axial position of the blade outlet edge. And the axial distance between the blade exit edge and the guide vane field exit was 6, 3 and 1 mm. The numerical simulation of three schemes was carried out respectively by Ansys CFX software, and the computational domain was established based on the two-stage pump model, and multi-condition numerical simulation was carried out by the stan-dard k-ε turbulence model and standard wall function. The performance of the three schemes was predicted respectively, and the prediction results were compared and analyzed. The results show that the extension of the diffuser exit side can suppress the evolution and growth of the vortex core due to the flow separation and eliminate the vortex in the guide vane flow channel, and improve the flow field distribution of the liquid at the inlet of the secondary impeller. Compared to the first two schemes, the guide vane structure of the third scheme has greatly improved the rectifying capacity of the guide vane.
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Received: 01 October 2016
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