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| Structural optimization design of impeller vane of shaft seal pump based on CFD |
| MU Zhenwei1, GUI Xinwei1*, XIA Qingcheng1, ZHANG Zhishan2 |
| 1. College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China; 2. Hongshanzui Hydropower Station, Xinjiang Tianfu Energy Co. Ltd., Shihezi, Xinjiang 832000, China |
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Abstract In order to study the leakage water flow characteristics in the shaft seal of the pump impeller in the Francis turbine, CFD software was used to explore the feasibility of improving hydraulic efficiency and pressure reduction effect in the shaft seal in term of turbine four in the Xinjiang Hongshanzui 1st cascade hydropower station based on different pump impellers.The impeller vane angle and height are varied on the basis of model accuracy,respectively; 22 improved geometric models are numerically si-mulated in total.The results show that the impeller with 45° vane angle and 0.081 5 height ratio can increase the vacuum degree in the shaft seal by 60.9%.The change in vane height is more favorable to the hydraulic efficiency improvement of the impeller than that in vane angle.There is a most unfavorable height ratio for the impeller shroud. In the position determination of the shroud,the most unfavorable height ratio of 0.135 9 must be avoided.Since the study is based on parameterization of model structure, the universality of conclusion is improved in some extent, and a certain theoretical basis is providedfor the shaft seal design and transformation in engineering.
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Received: 25 October 2019
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