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| Influence of hub and shroud on three-dimensional inverse design of mixed-flow pump impeller |
| CHANG Shuping1*, YAO Dingyuan1, LI Kunpeng1, FANG Xianjin2 |
| 1. Chinese People′s Liberation Army 63983 Troops, Wuxi, Jiangsu 214035, China; 2. Guangzhou Marine Engineering Corporation, Guangzhou, Guangdong 510250, China |
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Abstract In order to improve the controllability of blade design, the influence of hub and shroud on the 3D inverse design of mixed-flow pump impeller was studied. Based on the 3D inverse design me-thod with inviscid and viscous iteration, a mixed-flow impeller with the specific speed 449 was taken as the research object, and a series of impellers were designed by changing the shape of hub and shroud on basis of unchanged control parameters such as blade load distribution, inlet and outlet circulation. Based on SST turbulence model and SIMPLEC algorithm, the flow characteristics of the impellers were calculated numerically. The results show that hub and shroud have significant influence on blade geo-metry and flow field characteristics. The high-efficiency working area can be optimized by adjusting hub and shroud and the efficiency under high flow condition can be improved by increasing the area of flow passage. The hub has a significant influence on pressure distribution on the blade hub section, while the shroud shape has a great influence on pressure distribution of the whole blade. The small area of the impeller outlet flow passage causes a pressure trough on the blade hub section. The combination of 3D inverse design and 3D forecast simulation can play an important role in mixed-flow pump design, which has certain engineering application value.
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Received: 24 February 2020
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